5140 Temp/Humidity Probe
Contents
1. 10UT 4 IN 2 4 IN2 SHLD 2 C D SG 1 SG 1 REs1 IG 2 4 9 SG 2 10 RES2 se 3 4 rES3 Sensor Model 5140 OD IN 1 4 O IN 1 7 lour IN2 4 9 IN2 19 SHLD 2 C D SG 1 4 SG 1 IG 2 4 9 SG 2 10 RES2 SIG 3 RES3 5140 User s Manual 5 Humidity and Temperature Probe CALIBRATION The model 5140 is calibrated at the factory and can not be calibrated in the field If recalibration is re quired return the sensor to the factory for service 6 5140 User s Manual Humidity and Temperature Probe CALIBRATION RECORD Each Model 5140 is calibrated at the factory to give accurate temperature and humidity readings over its full operating range To allow for the slight variations between sensors three calibration points are used to ensure consistent operation These calibration numbers are printed on the Model 5140 s label and should be transcribed to this page by the user upon unpacking of the sensor These numbers are required for configuration of a Q Net system and may be requested by Customer Service representatives during prob lem calls Keep this page as part of your Q Net system s configuration record Model 5140 Humidity and Temperature Probe Serial Number 0 C 0 RH 75 RH 5140 User s Manual iii Humidity and Temperature Probe MAINTENANCE The Model 5140 normally requires no maintenance other than2. as the Model 8141 A or a motor aspirated radiation shield MARS such as the Model 8152 A The MARS provides the highest accuracy since it maintains the sensor s immediate environment at the level most consistent with the outside environment SARS Installation All Weather Inc s SARS units provide passive shield ing and aspiration for sensors that are sensitive to environmental effects such as solar radiation wind and precipitation The Model 5140 mounts within the SARS by means of a threaded adapter on the underside of the SARS The sensor cable is hard wired to the appropriate Qualimetrics Sensor Inter face QSI channel within the Q Net StationPac ac cording to the diagrams in Figure 1 Consult the Q Net system configuration table included with your Q Net system to determine the proper QSI chan nel The temperature portion of the sensor can be wired in either a two wire or four wire configura tion The two wire configuration uses the same two wires for applying current to the sensor as for mea suring the voltage across the RTD element In the four wire configuration voltage is measured directly 4 5140 User s Manual across the 1 000 ohm platinum RTD element elimi nating the resistance of the wire itself from the mea surement The two wire configuration is normally employed since the resistance added by the wire is negligible in relation to the 1 000 ohm sensing ele ment In longer cable runs however this resis
3. ensuring that the MARS or SARS is free of obstructions and periodically cleaning the sin tered filter To clean the filter unscrew it from the sensor body and submerge it in warm soapy water The filter may be lightly scrubbed to remove embedded dirt or debris Rinse the filter and allow it to dry thoroughly before replacing it on the sensor body 5140 User s Manual 7 Humidity and Temperature Probe SPECIFICATIONS General Excitation voltage Temperature range Current consumption Surge protection Relative Humidity Sensing element Measuring range Response time to 90 of step change in RH Output signal Output impedance Known voltage outputs provided for calibration Accuracy Q Net use 0 to 90 RH 90 to 100 RH Hysteresis Repeatability TC of zero offset Temperature effect non Q Net use 8 to 13 Vdc 55 to 459 C 0 4 mA nominal Series resistors 1 5 kW zener diodes Thin film capacitor 0 100 RH 3 minutes 0 4 to 2 VDC nominal 1 0k Ohm 0 2 Outputs at 0 and 75 3 RH 3 RH 4 RH 0 5 RH typical 0 5 RH 0 007 RH C 0 to 55 C 0 16 RH C 50 RH 40 to 0 C 0 44 RH C 50 RH Note When the model 5140 is used in a Q Net system temperature effects are digitally compensated so as to realize an accuracy of 4 over the temperature range of 40 to 55 C O 100 relative hu midity Temperature Sensing element Resistance at 0 C Coefficient alpha Known
4. resistance value provided for calibration Temperature range Temperature rise due to RH sensing element Accuracy after subtraction of temperature rise Thin film platinum 1000 2 0 Ohm 3 75 Ohms C 0 C value 0 1 Ohm 55 TO 55 C 027 C 0 5 C See Table 1 for resistance versus temperature values 8 5140 User s Manual D allweatherinc All Weather Inc 1165 National Drive Sacramento CA 95818 Fax 916 928 1165 Phone 916 928 1000 Toll Free 800 824 5873 www allweatherinc com 5140 001 ECN 4576 February 1996
5. Humidity and Temperature Probe Model 5140 allweatherinc TO CALIFORNIA Humidity and Temperature Probe TABLE OF CONTENTS INTRODUGTION Ae E ES EEE E E E EEE EVAN K NMUU EKaUUN SEEN UKIAA KEKSIEN 1 THEORY OF OPERATION cccccssccseccseeceecceseeenccseeceneceaeccaecenseensuensceneseaeseaeeeneesnesenessaessaees 2 Relative PAINT sipsirin 2 TSI DET ILDS ircen e a e ES 2 SENSO BOY aca ceca eect tes ecceececetas a cece E EE Hi HETT AIN TT 2 Sensor EleCtrONiCS naiscan araa n aa ina aeaii 2 MOUNINO Arene a E et secs para ep maataan ace 2 OF EET EE rete a m AEST 2 INSTALLATION E A E E A nis E TNT AMEL A ed eee TE 4 SARS Installation ccccccececccccscscccseeceneceececeeeceeseaesaeceeserevcrevaeesaaeseaeeeeecreeceessatsaaeereees 4 MARS Installation ecenin 4 CALIBRATION czssccctscsectesis besoctesheatevnticti AT aa 6 A A a E E E E E A MAAN NENMA ASEN 7 SPEGIFICATIONS voia aaa 8 CALIBRATION RECORD scescesccssicetsevs sods secant ce scenes n en thencid Gia Messner 11 5140 User s Manual ii Humidity and Temperature Probe INTRODUCTION The All Weather Inc Model 5140 Humidity and Temperature Probe provides accurate temperature and relative humidity mea surements using a state of the art design This versatile probe is used to measure ambient temperature and humidity in Q Net sys tems where its output is combined with those of other sensors to provide an integrated weather picture The Model 5140 normally moun
6. tance may become a factor Consult All Weather Inc if long cable runs are anticipated For detailed mounting and installation instruc tions for the SARS and Model 5140 refer to the manual included with the SARS For detailed Q Net installation and operation instructions consult the Q Net User s Manual MARS Installation All Weather Inc s MARS units employ a motor driven fan to maintain the conditions within the shield at a consistent level for accurate monitoring of ambient conditions The Model 5140 mounts to brackets within the MARS unit The sensor cable is hard wired to the appropriate Qualimetrics Sensor Interface QSI channel within the Q Net StationPac These installations require special consideration and wiring diagrams will be provided separately with the Q Net system manuals Contact All Weather Inc for details on using the Model 5140 with a MARS unit Humidity and Temperature Probe Channels 1 Temp amp 2 RH l i 7 SHIDO 7 10UT 8 GND2 8 IN 2 Channels 2 Temp amp 3 RH on N BRN Z INO D GND1 VRE xv v GNDo No SHIDO tes GND2 Figure 1 Model 5140 wiring for all OSI channels SARS installation B OD IN 1 4 2 IN 1 D1 RREF O IN2 D HD3 C D SG 1 SG 1 RESs1 8 sG2 9 SIG 2 IG 3 2 res Sensor Model 5140 B OD IN 1 4 2 IN 1 D1
7. the polymer sensor is compensated over the temperature range of 40 to 55 C by means of proprietary algorithms designed into the Q Net system 2 5140 User s Manual Each probe is delivered with three calibration values When the probe is installed into a Q Net system these calibration values are entered via the Q Net keypad or via a computer running the QSoft PC software The calibration values are then stored in battery backed memory and used by the Q Net system to calculate accurate RH temperature and dew point values Mounting The Model 5140 is used to measure ambient tem perature and humidity in Q Net systems where it is normally mounted within a self aspirated radia tion shield SARS such as the Model 8141 A For optimum temperature measurement the sensor can instead be mounted in a motor aspirated radiation shield MARS such as the Model 8152 A Neither radiation shield is included as part of the 5140 and must be ordered separately Cable Each probe comes standard with 20 feet of attached cable Humidity and Temperature Probe RESISTANCE y TEMP C 769 015 60 807 873 846 576 885 132 923 550 961 837 1000 000 1038 042 1075 963 1113 764 1151 445 1189 005 1226 445 Table 1 Resistance versus temperature Model 5140 5140 User s Manual 3 Humidity and Temperature Probe INSTALLATION The Model 5140 can be mounted within either a self aspirated radiation shield SARS such
8. ts within a self aspirated ra diation shield SARS such as the Model 8141 A For optimum temperature measurement the sensor can instead be mounted in a motor aspirated radiation shield MARS such as the Model 8152 A Neither radiation shield is included as part of the 5140 and must be ordered separately The sensor elements are protected from environmental con taminants by a removable sintered filter and the sensor electron ics are housed within a rugged O ring sealed metal case The probe comes standard with 20 feet of attached cable 5140 User s Manual 1 Humidity and Temperature Probe THEORY OF OPERATION Relative Humidity For relative humidity measurement the probe fea tures a rugged polymer capacitive humidity sensor constructed directly onto a monolithic interface cir cuit Temperature Temperature measurement is provided by a preci sion thin film platinum 1 000 ohm RTD whose resistance changes in response to temperature changes Table 1 provides a list of corresponding temperature and resistance values Sensor Body The sensor element is mounted within a rugged metal housing fitted with a replaceable sintered fil ter to protect it from dirt atmospheric pollutants and condensation Sensor Electronics Solid state electronic circuits are built into each probe to produce a buffered 0 4 to 2 Vdc output nomi nal corresponding to 0 to 100 relative humidity The slight temperature dependence of
Download Pdf Manuals
Related Search