OPERATING INSTRUCTIONS DP-151
Contents
1. 10V whole range 9 99 to 25V 1 to 1V whole range 999 9 to 2500 100 to 100mV whole range 99 99 to 120 0mV resolution 1mV 100uV or 10uV range dependent input impedance gt 100 Mohm except 0 to 10V gt 100kohm linear non linear display scaling and OFFSET Current two ranges 0 4 to 20mA whole range 9 99 to 25 0mA resolution 2UA input impedance 100ohms linear non linear display scaling and OFFSET output with 24VDC power supply if required Resistance range from 0 to 1000ohms whole range 0 to 14000hms resolution 0 10hm two or three wire connection linear non linear display scaling and OFFSET Outputs Alarm outputs standard two alarm limit relay outputs 230VAC 2A two additional optional transistor drive outputs open collector 24VDC 0 14 Current output optional 4 to 20mA output signals using internal 24 or external power supply maximum loading 1 kohm RS 232C serial interface optional standard digital short range interface for asynchronous communication 1200 Baud 8 data bits 1 stop bit three pin socket connection RS 485 serial interface optional standard digital interface for long range multi drop communication two screw connector General Display 4 digit seven segment LED height 14 mm Measurement rate gt 5 measurements per second Temperature coefficient ambient gt 50ppm C Self calibration continuous Precision 0 1 of range 12. Display SENS Pg PRESS SET Sensor settings PRESS A Display OFFS Pg PRESS SET Offset value PRESS RESET PRESS RESET PRESS A option Pg PRESS SET Display OP Output scaling PRESS RESET PRESS A Pg PRESS SET Display Addr Serial address PRESS RESET PRESS A PRESS RESET Display PASS Pg PRESS SET Password setting PRESS A DISPLAY 0000 Give Password with pe A V Buttons Alarm subprogram SENSOR selection subprogram OFFSET subprogram OP Output subprogram ADDRESS subprogram PASSWORD subprogram C PROGRAMMING SUB MENUS Main Menu ALR PASS XXXX Pg Settings Display current password m Change V A PRESS SET PRESS RES Main Menu OP or PASS OFFS Settings X XX Pg Display OFFSET value ENT Change V A PRESS SET PRESS RES T Main Menu Settings L1 Display XXX X Pg PRESS RES Addr 4mA scaled value Lo OPTION E Change V A PRESS SET L2 Display XXX X Pg 20mA scaled value Hi Change V A SET PRESS RES Main Menu PASS Addr XX Pg Settings Display current address PRESS RES OPTION WEE Change V A SET Main Menu SENS ALR L1 Display L1 level Pg Settings OFF Hl or LO PRESS RES Change V A PRESS SET PRESS SET L1 Display db Pg L1 level hysteresis XX X Pg Display Current Hyster
3. O gt a PRESS SET Display E Current V 1 Voltage 0 1V PRESS SET V 10 Vol 10V ya sas PRESS SET 20 20mA 0 20 Current 0 20m PRESS SET 4 20 Current 4 20mA PRESS SET PRE ET r 3 Resistance PRESS SET 55 5 0 1400ohm 3 wire PRESS SET PRESS SET r 2 Resistance PRESS SET 0 1400ohm 2 wire 1 f scalable input is selected as OFFS the instrument indicates the input value in Volts mA s or Ohms In Pt 100 2 wire measurements lead resistance must be set as OFFS value Over range situation is indicated by OL in display Main Menu OFFS h PRESS SET PRESS SET dp 0 3 Pg XXXX Lo XXXX Hi Current low point Current hi point Display Current Des point Change Change V A V A Display Currrent PRESS SET Des Point B XXXX P XXXX Pg 9 PRESS SET Current lowest Current low point input point in display Change Change VIA V A PRESS SET Max 15 Settings pair
4. A or B P Measurement data ID DP replies XXY XXX XXL XXX XXH XXX XXCR sign or After Y the most recent measurement result After L the minimum value After H the maximum value Or overflow XXY 999 9 if the measured value lies outside the measurement range Or request for repeat XXCR NOTE 1 In all situations both the DP and the PC may request a repeat of the data NOTE 2 After maxima and minima are given the values are zeroed 9 2 RS 232 RS 485 DATA COMMUNICATION PARAMETERS At the rear of the meter there is a three contact plug for the RS 232 connection or the two terminal screw connector for the RS 485 connection A second interface may only be used when requested on ordering The data transfer rate is 1200 baud 8 data bits 1 stop bit The maximum frequency of requests for measurement information is 1 Hz 9 3 OPERATION AND PROGRAM FLOW CHARTS 21 A NORMAL OPERATION CURRENT MEASUREMENT VALUE DISPLAY SET XXXX Pg Level L1 XXXX Lo XXXX Hi Min value display Max value display Set point Zero with RESET Zero with RESET Change AIV PRESS SET L2 XXXX Pg LEVEL 12 Set point XXXX Level 3 Set point S XXXX Level 4 Set point PRESS V PRESS A B PROGRAMMING MAIN LEVEL NORMAL MEASUREMENT OPERATION PRESS RESET Display PASS PRESS RESET Wrong Password PRESS SET PRESS RESET E Display Alr Pg PRESS SET Alarm settings PRESS A
5. EXTERNAL INTERNAL Ps SE CE 7 EXTERNAL EXT RELAYS POWER i L1 L2 5 1 INPUT CONNECTIONS Pt 100 2 WIRE RESISTANCE THERMOMETERS The lead resistance between the sensor and the meter should be compensated for by programming an offset value in order to produce accurate results THERMOCOUPLES Thermocouple wires should be taken right from the place of measurement to the meter with the same quality of thermocouple wire or a compensation cable This ensures that the automatic cold junction compensation corrects the display reading to give the correct temperature The thermocouple temperature display is based on the DIN standard millivolt temperature tables CURRENT MEASUREMENTS AND VOLTAGE MEASUREMENTS 0 10V The input is often a 2 wire source and the supply for this may be taken either from a separate supply or from the meter power supply When the meter power supply is used it is connected according to the item I POWER shown the diagram other wise it is connected the same way as in voltage measurements item U I in the diagram In all current measurements and in 0 10V voltage measurements the DIP switch on the rear panel of the meter must be set correctly in the ON position according to the measurement being made positions 1 or 3 positions 2 and 4 are not used with the DP 151 5 2 ALARM RELAY OUTPUTS The standard meter has two adjustable alarm limits L1 L2 both of which can provide rel
6. and with some models calculation There is also a wide variety of other equipment available for use with the DP 151 to further expand possible applications These include PC communication programs and equipment relays and additional limit controls converters separators and adapters different current sources parallel displays plotters and recorders Full details of additional functions and accessories are given in section 6 Further details and information about applications and other equipment is available from Envic or your representative 2 CONSTRUCTION The DP 151 is a small compact unit intended for flush panel mounting so that the display and front panel push buttons are easily accessible The rear connector block for power supply inputs and relay or other outputs and the DIP switch on Panel opening Installation dimensions the rear panel are quickly accessed by withdrawing the meter from its mounting The front panel display and push buttons are sealed to class IP54 standard The construction is of high quality moulded plastic and is extremely robust 3 OPERATION There are three main operation levels A Normal measurement the display updates the current measurement value the one program function possible is setting of alarm limits B Main program level the front panel push button and display are used to select the items to be programmed for which values are s
7. digit Case 96 x 48 mm flush mounting case per DIN standard front panel sealed IP54 flush mounting depth 120mm Weight 300g Operating temperature range 0 to 60 C Storage temperature range 40 to 85 C Power supply 230V 50Hz or 24VDC optional 10 8 MODELS AND SERIAL NUMBER The meter serial number and type number will be found on the label attached to the case Explanation of type numbers DP 151 Standard one channel meter C Equipped with current source S2 Equipped with RS 232C serial interface S4 Equipped with RS 485 serial interface E2 Equipped with two additional alarm limits P24 Power supply 24VDC P12 Power supply 12VDC XXX Additional operational code number for special applications XXX three letter number code for explanation see application operating instructions 20 9 APPENDICES 9 1 DATA COMMUNICATION PROTOCOLS RS 232 RS 485 Measurement information may be transferred from the DP 151 152 using RS 232 RS 485 serial data transfer protocols to an external device which is assumed to be a PC The PC may set for data communication using the DOS command Mode according to the data transfer rate and characteristics of the meter see below Data is transferred according to the following scheme 1 Starting communication PC sends XXCR XX DP address CR carriage return DP replies XXCR 2 Request for measurement data PC sends XXYPCR start symbol XX DP address Y Channel 0
8. the digital traffic protocol see section 9 1 and 9 2 The address of the DP 151 meter is given to the fulfil the protocol at the main program level At the main program level select Addr in the display using the up arrow push button and approve this by pressing the SET push button The display will then show the current address XX Either accept this or change to the required address from 01 to 99 using the up and down arrow push buttons and approve this by pressing the SET push button after this the meter changes to main program level Press the RESET push button to return to normal operation 4 1 7 ADDITIONAL ALARM LIMIT opt 3 When the meter has been ordered with additional alarm limits L3 and 14 their operation is the same as the standard alarm limits L1 and L2 but without the alarm indicator lights The outputs are transistor controlled see section 5 Connections Setting of alarm limits is done in the same way as the standard alarms limits can be set from the normal measurement operation and also from the main program level in which hysteresis and delays are also set see section 4 1 3 But because there are no indicator lights for these additional limits the display will show L3 after the L1 and L2 limits have been set when the L1 and L2 indicator lights show and then after L3 has been set the display will show L4 and this level is set 4 1 8 CHANGE OF PASSWORD PASS The main program is prot
9. this to the required value by using the up down arrow push buttons and approve this by pressing SET 10 If no delay is required press the down arrow push button instead of SET when the display shows dEL 4 After delay setting the meter will change to the setting of the second alarm limit and the L2 indicator lamp will light The settings are given in exactly the same way as described above When this has been completed the meter returns to the main programming item SEnS Pressing the RESET push button causes a return to normal operations The alarm setting flow diagram summarises the process 1 SELECT HI LO ALARM LIMIT OR OFF 2 SELECT HYSTERESIS VALUE dB BY FIRST PRESSING SET OR NONE BY PRESSING DOWN ARROW 3 SELECT ALARM DELAY TIME deL BY FIRST PRESSING SET OR NONE BY PRESSING DOWN ARROW 4 REPEAT WITH OTHER ALARM LIMIT 5 RETURN TO NORMAL MEASUREMENT BY PRESSING RESET 4 1 4 CHANGE OF MEASUREMENT RANGE OFFS If the meter is to be set to show a greater or lesser value than the actual input value constant offset from the basic settings the value is set under the OFFS item in the main program menu Press RESET for 5 seconds give the password and select OFFS using the up down arrow push buttons and approve this by pressing SET The display will then change to show the previous numerical value of OFFS Now set the required offset value in the display together with the correct sign and approve
10. Check the settings on the DIP switch an the programmed values c Check that the meter holds a value i e use a constant input from a calibrated or artificial sensor in temperature measurements with a Pt 100ohm sensor make sure that 100ohm gives 0 degrees C in the display Other operational faults a Check program settings b Disconnect the power from the meter and open the rear panel 4 screws With draw the panel and the boards attached and inspect the attachment and condition of components on the boards When it is not possible to find and correct a fault on site contact the ENVIC service department or your local representative or return the meter for repair 6 3 2 MANUFACTURERS SERVICE DEPARTMENT The address of the manufacturers service department is ENVIC OY Street address Lemmink isenkatu 46 20520 TURKU FINLAND Postal address P O BOX 100 20521 TURKU FINLAND Telephone 358 02 48082400 Telefax 358 02 48082404 7 TECHNICAL SPECIFICATIONS Inputs Selection and programming with the display and front panel push buttons or handheld programming unit or PC with special program Pt 100 ohm resistance sensor measurement range 200 to 850 C resolution 0 1 C two or three wire connection absolute or relative values Thermocouples J K or S measurement range 260 to 1760 C resolution 0 1 C automatic decimal point and cold junction compensation Voltage three ranges 10 to
11. ENU PASSWORD ALARM SENSOR OFFSET OPTIONS PASSWORD 4 1 2 SELECTION OF INPUT SENSOR After programming has been started press either of the arrow push buttons until the display shows the message SENS It is now possible to select the input sensor and to set sensor program values Now press the SET push button and one of the following alternative input sensor codes will be displayed P 3 Pt 100 ohm resistance sensor 3 wire connection P 2 Pt 100 ohm resistance sensor 2 wire connection Prh Pt Pt Rh thermocouple type S Chal Ni Ni Cr thermocouple type K FECO Fe Const thermocouple type J U 01 Voltage range 0 100mV U 1 Voltage range 0 1V U 10 Voltage range 0 10V 0 20 Current range 0 20mA 4 20 Current range 4 20mA r 3 Resistance range 0 1400 ohms 3 wire connection r 2 Resistance range 0 1400 ohms 2 wire connection SUBPROGRAM SELECTIONS High Low L1 L2 ALARM Hysteresis LIMITS Delay INPUT Pt Resist thermometer SENSOR Thermocouples Current Voltage Resistance NUMERICAL VALUES Linear non linear no scaling Offset values current limits Password change OUTPUT OPTIONS Current output Serial output address Additional alarm limits Using the arrow push buttons scroll up down to select the required input sensor code in the display and then press the SET push button to select this input The next phase of programming varies according to the par
12. OPERATING INSTRUCTIONS DP 151 PROGRAMMABLE PANEL METER CONTENTS 16 04 2003 VER 1 2 gei zi 5 eee M 1 2 CONSTRUCTION nets ner gr tan Or VIS bw EPIS a EP DEVE EIE 2 OPERATION Z NAD aas due dates en A Ru E ARE RAN RR ERR RN RAE 3 3 1 PUSH BUTTONS pem 3 EmAl MesienaBcuilpe 9 4 3 3 NORMAL MEASUREMENT U U nn nnn 5 4 PROGRAMMING THE METER U oca unn acne u u u uu uu J 6 4 1 BASIC PROGRAMMING U I I nennen nennen ennemi 6 4 1 1 STARTING PROGRAMMING L L L treten enne nennen 6 4 1 2 SELECTION OF INPUT SENSOR 6 4 1 3 ALARM LIMITS sese tnn nnne nennen erret 9 4 1 4 CHANGE OF MEASUREMENT RANGE 11 4 1 5 CURRENT OUTPUT OP option nnnm nnne nnns 11 4 1 6 SERIAL INTERFACE OUTPUT ADDR option 2 iii 11 4 1 7 ADDITIONAL ALARM LIMIT Opt 11 4 1 8 CHANGE OF PASSWORD 85 12 5 CONNEC TIONS niu cu d c ax ga eel dpa ded daa d Cd RE 13 5 1 iugeejlidiude c 14 5 2 ALARM RELAY OUTPUTS II S Sua a Ra Sau sal 14 5 3 CURRENT OUTPUT 4 20mA U U u uu uu uu uuu u u
13. ay contact closures max 230V 2A in addition to lighting L1 and L2 On special order the operation direction may also be a contact opening When the contacts drive an inductive load it is recommended that the control circuit is equipped with an RC filter in order to attenuate voltage peaks On special order it is also possible to obtain two more alarm limits L3 L4 with transistor outputs max 24VDC 0 14 If these outputs are used with an inductive load e g a relay it is recommended that a protective diode is connected in parallel with the output circuit The power supply for the additional limits may be either an external power supply or the meters own power source When the meter power supply is used remember that the maximum output capacity is 80mA and that allowance must be made for other outputs which use the source see 5 1 and 5 3 5 3 CURRENT OUTPUT 4 20mA On special order the meter can be connected to give a current output of 4 20mA over a specified measurement range There are two different alternative connections depending on whether the power source is an external one or from the meters own power supply The maximum load for the output is 1 kohm and in an overload situation the continuous currentmay be up to 25mA Current output connections when using an external and the built in power supply are as shown in the following diagram NOTE The input to units connected to the current output must
14. e ratio factor in arithmetic calculations 6 2 ACCESSORIES There are also a wide range of options and accessories some of which may be built in which are available for use with the DP 151 Such accessories are also provided with their own operating instructions which give complete details Accessories include PC communication programs and equipment Relay units with additional limit controls Serial converters separators and adapters Different current sources Parallel displays plotters recorders Transmitters sensors and measurement converters 6 3 WHAT TO DO IN THE CASE OF A FAULT Prior to any attempt at fault finding check that the following operational conditions are correct Mechanical condition no obvious damage Connections properly made and good ground compare with connection diagram Power supply correct voltage and tolerances minimum ripple with DC supplies Electrical loading max of 80 mA 24VDC allowing for output and additional relays also max loading for alarm output circuits and current output Program settings input output limits scaling etc DIP switch settings 6 3 1 FAULT ANALYSIS Display is completely dark Check the fuse and the power supply voltage Display has stopped and programming is not possible Disconnect the meter from the power supply and then reconnect Display incorrect or OL overload a Check the sensor and the sensor lead b
15. ected with a numerical password this may be any number from 999 to 9999 The password programmed in during manufacture is 0 If it is required to change this password at the main program menu level select the display value PASS and press SET 1 The display will then show the current password Use the up down arrow push buttons to select a new number and press SET to approve it and store it in the meter memory The display then changes to show the symbol for alarm setting Alr from the main program menu Press the RESET push button to return to normal operations WARNING After changing the password it is only possible to return to programming using the new password Remember to record the new password in a safe place If for some reason the password is forgotten and lost contact your local representative or the service department at the manufacturer see section 6 2 13 5 CONNECTIONS The meter is delivered with the following connection diagrams shown on the back cover next to the input output connections Any options shown in these diagrams which were not ordered are omitted Before making connections on the rear panel check that connectors are clean and undamaged and ensure that proper high quality connection cables are used with grounded shields where appropriate 230 50Hz L N 230 24 200mA CHANNEL 1 CURRENT LOOP SERIAL P ORTS 230 24 POWER SUPPLY RS 485 RS 232 4 S S i
16. een pairs Input value 3 The display will then show the display value corresponding to the highest input value and the HI lamp will light up Set the required display value using the up down arrow push buttons and approve it by pressing SET Scaling is now complete and the display will change to the main menu item OFFS If the input greater or less than the scaled maximum and minimum values the display will continue to show the scaled value according to the set values Pressing the RESET push button causes a return to normal operations NON LINEAR SCALING The scaling range is the same as for linear scaling from 9999 to 32000 but in this case includes setting the input values The input values may cover the whole measurement input range The range O 10V is programmed in volts and the ranges 0 1V and 0 100mV are programmed in millivolts e g 1V is shown in the display as 1000 Scaling is done in order first for positive values starting with the smallest input value and then the negative values also starting from the smallest input value 1 After non linear scaling has been selected the display will show the present position of the decimal point dP X where X 0 1 2 or 3 the number of figures after the decimal point Choose the number of figures after the decimal point by using the up down arrow push buttons and approve the value by pressing SET 2 Following this the display will show the readin
17. esis Change V A L1 Display DEL Pg PRESS SET L1 Display L1 Input delay x 0 1s SET Pg Change V A PRESS SET L2 Display L2 level OFF Hl or LO Change V A PRESS SET PRESS SET Pg L2 Display db Pg L2 level hysteresis L2 XX X Pg Displayed Current Hysteresis E PRESS SET Change V A L2 Display DEL Pg PRESS SET L2 Display Pg L2 input delay x 0 1s Change V A PRESS SET L3 L4 levels lid optio YES See next page Display L3 Pg Main Menu SENS 1 optio level PRESS RES PRESS SET Display L3 level Pg PRESS RES OFF HI or LO EE V A PRESS SET Display db Pg PRESS SET L3 level hysteresis XX X Pg PRESS v Display Current Hysteresis PRESS SET Display DEL Pg PRESS SET Display L3 Pg Input delay x 0 1s p Change VIA Press SET Display L4 Pg PRESS RES Display L4 level Pg PRESS RES OFF HI or LO WTA PRESS SET Display db Pg L4 level hysteresis PRESS SET XX X Pg Display Current Hysteresis PRESS V PRESS SET Change V A Display DEL Pg PRESS SET Display L4 Pg Input delay x 0 1s Change PRESS SET V A SENS sett Display Pg PRESS RES Current input sensor Change V A P 3 Pt 1 hm 3 wi 3 Pt 1000hm 3 wire PRESS SET P 2 Pt 1 hm 2 wi t 1000hm 2 wire PRESS SET Prh PtRhPt Thermoc Chal NiCrNi Thermoc 01 Voltage 0 100mV zm 2120 O TI
18. et in the sub programs C Sub program level the front panel push buttons and display are used to set program values alarms and scaling of inputs and linearization Before the meter can be used in normal measurements it is necessary to connect a measurement input sensor and to use the program to tell the meter which sensor is being used With some sensors the DIP switch on the rear panel must be set correctly see sec 5 1 Once these settings have been made it is only necessary to connect power to the meter and to read the display If no change of input sensor or meter usage is required it will normally only be necessary to make these settings once The following describes the functions of push but tons and indicator lights and normal operation The next section describes the details of programming see appendix for programming and operation flow diagrams NORMAL MEASUREMENT DISPLAY MAXIMUM ALARM LIMITS MINIMUM L1 AND L2 NORMAL MEASUREMENT MAIN PROGRAM LEVEL PASSWORD 3 1 PUSH BUTTONS On the front panel of the meter there are four membrane push buttons which are used in programming in feeding in set values in reading stored values from the memory as well as in zeroing measurement values The up arrow push button has three functions 1 To change the displayed value to the current maximum measured value The maximum value is shown when the HI light is lit Press this push button again to
19. g for the lowest input value the first scaling set point input value and the A lamp will light up Set the required input value e g OV using the up down arrow push buttons and approve it by pressing SET 3 The display will now show the display value corresponding to this input value the first scaling set point display value the previous stored value and the B lamp will light up Set the required value using the up down arrow push buttons and approve it by pressing SET 4 The display will then show the second lowest set point input value and the A lamp will light up Setting and approval of the required value is done as before and the display changes to show the corresponding display value previous second lowest display value and the B lamp lights Setting and approval of the required value is done as before and the process is repeated with the other values A total of fifteen input display value pairs may be set Even if all possible values are not required it is safer to program reasonable additional values to those required e g the last programmed input display pair so that out of range readings do not cause faulty results When the settings have been completed the meter returns to the main program OFFS item Pressing the RESET push button causes a return to normal operations C CURRENT INPUTS 0 20 and 4 20 Current input settings and scaling are done in the same way as for voltage inputs Check the
20. it by pressing SET The display will then change to the main program menu PASS setting Press the RESET push button to return to normal operation As mentioned earlier this is used to compensate for the resistance of the connection cable in measurements of resistance with Pt 100 ohm temperature sensors 4 1 5 CURRENT OUTPUT OP option 1 When the meter is equipped with a 4 20mA current source an output directly proportional to the measurement value may be obtained by programming linear scaling into the meter memory Press RESET for 5 secs give the password and select OP using the up down arrow push buttons and approve by pressing SET 1 The display will then show the previous display value for the low 4mA output The LO indicator lights Enter the required new value using the up down arrow push buttons and approve it by pressing SET 2 The display then changes to show the previous display value for the high 20mA output The HI indicator lihts Enter the new value The HI indicator lights Enter the new value in the same way and approve with SET The display will then change to the main program menu PASS setting press the RESET push button to return to normal operations 4 1 6 SERIAL INTERFACE OUTPUT ADDR option 2 When the meter has been ordered with an 5 232 RS 485 serial interface connection measurement information may be transmitted in digital form using the serial interface according to
21. nd resistance The meter includes a built n programming capability which is used for selection of the input sensor for setting alarm conditions and other values All programming operations are done using the display and the four front panel membrane push buttons Measurement values and alarm states are indicated by the four digit display and indicator lights The display will also show maximum and minimum values The measurement sensor input may be linear or non linear and it is possible scale results over the whole measurement range and to set offset values The two standard alarm limits with normally open relay outputs are fully adjustable Two additional alarm limits with transistor controlled outputs are available to special order as well as analogue 4 20mA output and RS 232C or RS 485 digital serial communication interfaces The standard power supply voltage is 230V 50Hz but both 24V and 12VDC versions are available on special order If required the meter can in its standard form also supply the operating voltage for analogue current outputs additional relay control and strain gauge bridge measurements As a result of its broad measurement capability the DP 151 can be used instead of a number of different meters in many applications These include strain gauge and other bridge measurements pulse counting control operations cumulative measurements two channel measurements serial communication of measurements
22. not be at the same potential as the DP 151 EXTERNAL SUPPLY 5 4 SERIAL INTERFACES RS 232C 485 On separate order the meter may also be supplied with either an RS 232C or RS 485 serial digital interface The RS 232 connection uses a plug in contact on the rear panel of the meter The normal maximum distance from the DP 151 in such an application is 15m and it is intended for connection to one unit only However longer cables may be used provided that the load capacitance is not greater than 2500 picofarads The RS 485 connection uses the screw connectors on the rear panel of the meter S and S The maximum distance is then about 300m and multiple connections may be used If a greater distance is required electrical isolation of the data bus or use of a buffer memory will be necessary accessories are available for this purpose In both of these alternatives the DP 151 data communication rate is 1200 Baud and according to the standard protocols and include the transfer of binary serial data and stop start signals see section 9 1 and 9 2 BUILT IN SUPPLY 5 5 POWER SUPPLY CONNECTIONS The meter may be ordered with either a 230V 50Hz mains power input or a 24VDC 12VDC input In the 12VDC version current output operation will only operate with an external power supply Fuse protection prevents damage to measurement and programming circuits if there is severe disturbance on the power supply input The fuse is situa
23. ns will not affect their operation Alarm limits will also continue to be valid When the meter is equipped with additional alarm limits setting of alarm limits is done in the same way as the standard alarms above but because there are no indicator lights for these additional limits the display will show L3 after the L1 and L2 limits have been set when the L1 and L2 indicator lights show and then after L3 has been set the display will show L4 and this level is set As above return to normal operation at any time by pressing RESET 4 PROGRAMMING THE METER 4 1 BASIC PROGRAMMING 4 1 1 STARTING PROGRAMMING Start programming by pressing the RESET push button for about 5 sec The display will show the message PASS Give the right password using the UP DOWN arrow push buttons to select the number and press the SET push button The display will show the first program item ALR and the PROG light will show The main program items are ALR alarm setting sub menu SENS sensor setting sub menu OFFS offset value setting OP current output values setting ADDR serial interface address setting PASS password setting If an incorrect password is given the meter will return to the measurement value display and a second attempt should be made to give the correct password If the correct password is not known call the service department at the manufacturers or your representative see section 6 2 MAIN PROGRAM M
24. previous paragraphs section 4 1 2 C E RESISTANCE INPUTS r 2 r 3 Resistance input settings and scaling are done in the same way as for voltage inputs Check the previous paragraphs section 4 1 2 C With 2 wire connections in resistance measurements the lead resistance must be compensated for in the same way as for Pt 100ohm 2 wire temperature measurements i e the resistance of the lead must be measured without the sensor and the value programmed into the meter under the OFFS item 4 1 3 ALARM LIMITS Alr Two different upper and lower alarm limits may be set together with a hysteresis setting and a delay setting In alarm operation there are two relay contact operations and front panel indicator lamps L1 L2 which indicate the alarm state Numerical alarm values are not set in the basic program but in their own program which is not protected by the password There are two methods of setting the actual alarm limits the first during normal operation see section 3 2 and the second as part of the main program in which alarm hysteresis and delay may also be set see below Measured value Alarm High alarm limit lt Hysteresis value Z Hysteresis ranges ES Hysteresis value Low alarm limit When normal operation is changed to the main program level press RESE T for about 5 secs after the password has been given the display will show Alr the beginning of the alarm set
25. return the meter display to the normal measurement value 2 In the main program to step from one program parameter to another In subprograms this may also be done with the down arrow push button 3 To increase numerical values in programming including setting alarm limits or scaled values Pressing once changes the value by one digit pressing continuously causes the value to change rapidly SUBPROGRAM MENUS ALARM PROGRAM INPUT SENSOR SELECTION pu SCALING SENSOR OFFSET SETTING NUMERICAL VALUES SUB PROGRAM LEVEL OPTIONS The down arrow push button has three functions 1 To change the displayed value to the current minimum measured value The minimum value is shown when the LO lamp is lit Press this push button again to return the meter display to the normal measurement value 2 In programming together with the up arrow push button to step from one program parameter to another 3 To decrease numerical values in programming including setting alarm limits or scaled values Pressing once changes the value by one digit pressing continuously causes the value to change rapidly The reset push button has two functions 1 To begin or to finish programming 2 To reset peak values to zero when they are shown in the display The set push button has two functions 1 During programming to accept or store a choice or a value shown in the display 2 During normal measuremen
26. ted on the rear panel of the meter Nominal power consumption of the meter is 4W and the variation in the power supply voltage may be 10 max of the nominal value If the mains power source is subject to fluctuations due to large loads it may be necessary to use a mains filter With DC power supplies check that the source is stable and free of pulses or mains ripple 6 OTHER INFORMATION 6 1 ADDITIONAL FUNCTIONS The DP 151 has been designed for a wide range of different special applications precise details of these will be found in the operating instructions for the particular version concerned of the meter The following is simply a list of the models for different applications Bridge measurements e g strain gauges and loading measurements Pulse inputs e g flow number and energy measurements Compensation measurements e g temperature compensation in pH measurements Display with calculation e g load speed measurements long term mean values efficiency measurements Control operations e g ON OFF and analogue control mixing ration control multi step control frequency pulse rate control Cumulative measurements integrated number measurements with analogue communication Serial interface applications e g remote monitoring of PCs serial transmitter receiver units and sampling analysis measurements And with the DP 152 two channel meter Two channel measurements sum differenc
27. ticular input sensor selected as follows A Pt 100 OHM RESISTANCE P 2 or P 3 The Pt 100 ohm resistance temperature table is stored in the meter memory Selection of P 2 or P 3 does not require separate scaling After selection using the SET push button it is only necessary to move directly to OFFS in the main program When a 2 wire P 2 sensor is used it is necessary to set an offset value using the main program item OFFS to compensate for sensor lead resistance The meter does not then display a temperature value greater than the actual value The resistance of the sensor lead WITHOUT SENSOR is measured with a separate ohm meter or with the DP 151 used in the resistance input mode see part E below The measured value is programmed as the meter OFFS value as follows After selection of the P 2 display choice the display will show the previously programmed resistance value the factory setting 0 the value of the measured lead resistance to a precision of 0 1 ohm using the up and down arrow push buttons When the correct value is shown in the display press the SET push button and the meter will store this value and proceed to the next stage of programming PASS Pressing the RESET push button causes a return to normal operations B THERMOCOUPLES Prh Chal or FECO The millivolt temperature tables for thermocouples J K and S are stored in the meter memory Selection of these thermocouples does not req
28. ting program If operation is already at the main program level and the display shows something else use the up down arrow push buttons to step through display items until the display shows Approve this by pressing the SET push button 1 After this the display will show the previous OFF HI LO alarm selection these are OFF no alarm monitoring Hl the upper alarm limit LO the lower alarm limit Setting of the first limit value is indicated by the L1 indicator light Select the first limit value using the up down arrow push buttons and approve the value by pressing SET 2 Following this the display will indicate setting of the hysteresis value difference limits by showing dB If it is required that the alarm returns to normal alarm operation only after the alarm has definitely been removed it is possible to set a difference or hysteresis value in relation to the alarm limit This cause a return and cancellation of the alarm only when the measured value is outside the limit set by the hysteresis value see figure To select a difference value press SET and to continue without one press the down arrow push button To select a value use the up down arrow buttons and approve it by pressing SET 3 After this the display will change to indicate delay setting by showing dEL If an alarm delay time time before the alarm is indicated is to be set press SET and the display will show the previous value in 100 s of ms Change
29. ts to move from the measured value to the alarm level set value and after reading or setting alarm levels to return to normal measurement 3 2 INDICATOR LIGHTS The indicator lights letter number combinations that light up on the front panel give alarms even during setting of values and other display operations Their functions are as follows L1 and L2 indicate alarms and will also light during value setting operations A and B in non linear scaling indicate whether the choice is the input value in measurements A or the display value B Pg indicates that programming of values is in progress Either basic programming or setting of alarm levels LO and HI in normal operation indicate whether the display shows peak values LO minimum and Hl maximum and at the basic programming level indicate the selection of upper lower alarm limits and lower upper selection points in linear scaling LO low level and Hl high level F is reserved to indicate display calculation not used in standard meters 3 3 NORMAL MEASUREMENT Press RESET to return to normal measurement The meter then begins to update the measured input values in the display The up arrow push button can be used to display the current maximum value zero this value by pushing RESET Return to normal operation by pressing the up arrow push button if RESET is not used The current minimum value is shown by pushing the down arrow push button
30. uire separate scaling After thermocouple selection using the SET push button the display changes to show the OFFS item of the main program Pressing the RESET push button causes a return to normal operations The meter includes automatic cold junction compensation for thermocouple measurements using a built in Pt 100 ohm resistance thermometer This prevents any changes in the environmental temperature from affecting input connections influencing measurements C VOLTAGE INPUTS U 01 U 1 or U 10 When voltage inputs are selected after the SET push button is pressed the display will show SCAL this means that this is a scaleable input Scaling allows a display readout to be given in practical units for example according to a linear or non linear calibration curve After SCAL is shown press SET and the display will then show one of the following alternatives Lin linear scaling All values are directly proportional to the display values and are related by a constant multiplying factor Usr non linear scaling All values are directly proportional to the display value but are not related by a constant multiplying factor instead the relation is given by a maximum of fifteen separate pairs of input display values The pairs are freely selectable over the whole input range Input values which are intermediate between these values are calculated by linear interpolation OFF no scaling No scaling is used and the displa
31. uu 14 5 4 SERIAL INTERFACES RS 232C 485 U U U u u u u uuu uu u uu 15 5 5 POWER SUPPLY CONNECTIONS U U U U u uuu uuu uuu uuu uuu 15 6 OTHER INFORMATION uu u civis Sce a Ri nns Sei e GE sa kuka sss AE Sa E ten eran tenus 16 6 1 ADDITIONAL FUNCTIONS eren nennen nnn nnn nsnm h intrat tn sinn seas sas adanan ikoan aaka atras snas masas 16 6 2 ACCESSORIES ciie E 16 6 3 WHAT TO DO IN THE CASE OF A FAULT 16 6 3 1 ANALYSIS e rod RR onda sete tet FRI REIR aspa eee nant 16 6 3 2 MANUFACTURERS SERVICE DEPARTMENT nennen 17 7 TECHNICAL SPECIFICATIONS nan nhan niu n daa Yan ra nan kan 18 8 MODELS AND SERIAL NUMBER U u u 19 9 APPENDICES ae 20 9 1 DATA COMMUNICATION PROTOCOLS RS 232 RS 485 20 9 2 RS 232 RS 485 DATA COMMUNICATION PARAMETERS u u u 20 9 3 OPERATION AND PROGRAM FLOWCHARTS U uu u u uuu uuu 21 1 GENERAL The DP 151 panel meter is intended for measurements of temperature using either thermocouples or resistance thermometers and for measurement of voltage current a
32. y shows the input value on the selected range the display shows the input value on the selected range Select the required operation using the up down arrow push buttons approve it by pressing SET If the OFF alternative is selected the meter changes directly to the main menu item OFFS because no other selections are required in this case When either Lin or Usr is chosen the next stages of programming vary according to the choice as described below LINEAR SCALING The range for scaling is over the whole measurement reading range from 9999 to 32000 and a difference of one decimal point is permitted between the upper and lower set values When a five numeral number is set the meter will show the four first numerals If the scaling range or the decimal point difference is exceeded the meter will show the message OL 1 After linear scaling has been selected the display will show the present position of the decimal point dP X where X 0 1 2 or 3 the number of figures after the decimal point Choose the number of figures after the decimal point by using the up down arrow push buttons and approve the value by pressing the SET push button 2 The display will then show the display value corresponding to the lowest input value and the LO lamp will light up Set the required display value using the up down arrow push buttons and approve it by pressing SET Display value HI value Linear LO value maximum of fift
33. zero by pushing RESET Return to normal by pushing the down arrow again The HI LO indicator lights show which of the two peak values is shown in the display measured value exeeds the set range this is indicated in the display by the OL symbol In normal operation if the RESET push button is pushed for about 15 seconds programming can be started see item 4 4 1 Setting alarm limits in normal operation Alarm limits can be changed with the meter in normal operation Press the SET push button and the display changes to show the current alarm limit 1 and both the L1 and PROG lamps will light Use the up down arrow push buttons to select a new value or leave the old value unchanged Press SET and the meter stores the value The display then shows limit 2 and the L2 lamp lights Give the new value in the same way Return to normal operation at any time by pressing RESET The DP 151 panel meter has an automatic self test system for checking its own operation In any disturbance situation the program will try to restart normal operation In meters equipped with the standard two adjustable alarm limits a relay contact closure occurs when the alarm occurs The display indicates an alarm by L1 or L2 indicator lights these lights go out when the value returns to normal When the meter is equipped with a current output supply or serial communication interface and if either is in operation the use of the push butto
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