Manual for SCO31 and SCO40
Contents
1. EMI FILTER 2ND FUSE OPTIONAL FUSE CGA ASTREA RIA Se eee ee TOR R 3 J TT TEMPERAT URE EL E 00 ret S En 1 E ul 5 amp SAJWF 33090934 2 LOOP PUD ET 1 RELAYS Ns AT UE AP AS i CONTROLLER a gt JUENCHA Y la VE v 9 A ong 7 ae Mi E x bt f CHAMBER FAN DOOR SWITCH a as ha HEATING ELEMENT INTERNAL CHAMBER OUTLETS WILL MATCH CONFIGURATION OF PLUG 182. REACH IN DRY CO INCUBATOR SCO31 SCO31 2 SC040 SCO41 2 PREVIOUSLY DESIGNATED AS 2428 2428 2 2440 2440 2 Revised 12 2013 4861504 INSTALLATION ND OPERATION MANUAL Sheldon Manufacturing Inc P O Box 627 Cornelius Oregon 97113 EMAIL tech Shellab com INTERNET http www Shellab com Shellab 1 800 322 4897 503 640 3000 FAX 503 640 1366 TABLE OF CONTENTS SECTION 1 0 SECTION 2 0 SECTION 3 0 SECTION 4 0 SECTION 5 0 SECTION 6 0 SECTION 7 0 SECTION 8 0 RECEIVING AND INSPECTION GRAPHIC SYMBOLS INSTALLATION CONTROL PANEL OVERVIEW OPERATION MAINTENANCE TROUBLESHOOTING PARTS LIST UNIT SPECIFICATION SCHEMATICS These units are TUV CUE listed as CO incubators for professional industrial or educational use where the preparation or testing of materials is done at approximately atmospheric pressure and no flammable volatile or combustible materials are being heated These units have been tested to the following requirements CAN CSA G22 2 No 61010 1 2012 CA N CSA C22 2 No 61010 2 010 R 2009 UL 61010 1 2004 R 2005 07 R 2008 10 UL 61010A 2 010 2002 UL 61010 1 2012 EN 61010 1 2010 EN 61010 2 010 2003 IEC 61010 1 2010 IEC 61010 2 010 2003 RECEIVING AND INSPECTION IMPORTANT READ THIS INSTRUCTION MANUAL IMMEDIATELY Your satisfaction and safety require a complete understanding of this unit including its proper function and operational characteristics Be sure operators are given adequ
3. operating under the conditions you intend to run your incubator MAINTENANCE NOTE Prior to any maintenance or service on this unit disconnect the service cord from the power supply 7 1 7 2 7 3 7 4 7 5 Cleaning Cleaning and decontamination are recommended on a regular basis To prepare the incubator for cleaning remove all interior parts such as shelves and shelf clips First clean the chamber with soap and water rinse and let dry To decontaminate use a solution that is appropriate to your application DO NOT USE chlorine based bleaches or abrasives as this can damage the interior chamber DO NOT USE spray cleaners that might leak through openings and cracks and get on electrical parts or that may contain solvents that will harm coatings WARNING Never clean the unit with alcohol or flammable cleaners with the unit connected to the electrical supply Always disconnect the unit from the electrical service when cleaning and assure all volatile or flammable cleaners are evaporated and dry before reattaching the unit to the power supply Check CO supply periodically do not let it run out Automatic tank switches are available from your dealer Periodically check CO supply lines and connections for leaks Use a liquid soap solution to detect leaks Wet supply line and connections and look for bubbles Keep the CO flow system free of impurities Erratic CO2 control is usually traceable to the CO2 pressure regulato
4. a fuse have a fuse installed This fuse may be at the inlet or part of the cord set male plug Note that electrical supply to the unit must conform to all national and local electrical codes Location When selecting a site for the unit consider conditions which may affect performance such as heat from steam radiators ovens autoclaves etc Avoid direct sun fast moving air currents heating cooling ducts and high traffic areas To ensure air circulation around the unit allow a minimum of 10cm of clearance between the incubator and surrounding walls or partitions which might obstruct free air flow Lifting Handling These units are heavy and care should be taken to use appropriate lifting devices that are sufficiently rated for these loads Units should only be lifted from their bottom surfaces Doors handles and knobs are not adequate for lifting or stabilization The unit should be completely restrained from tipping during lifting or transport All moving parts such as shelves and trays should be removed and doors need to be positively locked in the closed position during transfer to prevent shifting and damage Leveling The unit must sit level and solidly Leveling feet are supplied and should be installed in the four holes in the bottom corners of the unit With the feet installed and the unit standing upright each foot can be raised by turning it in a counterclockwise direction An opposite clockwise rotation will lower that foot Adjus
5. pad until the digital display begins to blink from bright to dim While blinking the display is showing the current set point which can be changed by pushing the UP and DOWN arrow pads until the desired value is reached If no adjustments are made within five 5 seconds the controller will default back to displaying the parameter within the chamber Once set point is established allow several hours for CO to stabilize Calibrating CO2 Controller During CO calibration it is important that the door not be opened for any reason and the CO has been stabile for several hours Using a Digital or CO2 Fyrite gas analyzer measure the actual CO2 within the chamber via the sample port on the left side of the unit If there is an unacceptable difference between the display and the CO analyzer get the unit into calibration mode by pressing both the UP and DOWN arrow pads at the same time until the decimal points begin to flash While the decimal points are flashing the display can be changed to match the analyzer reading by pushing the UP or DOWN arrow pads If no adjustments are made within five 5 seconds the display will default back to displaying the CO2 in the chamber After the display has restabilized and maintained set point for several hours check the actual CO2 again If the CO2 analyzer does not match the display repeat the calibration NOTE When using the CO analyzer insure that gas is not being injected while the reading is being t
6. scale past the point where the indicator light went off This should adjust the High Limit set point to approximately 1 C above the Main Temperature Control set point It is recommended that the High Limit set point be checked periodically to assure no changes have occurred A mark on the dial will aid for future reference if changes to this set point occur Temperature Alarms The Main Temperature Control has visual audible alarm indicators for HIGH and LOW conditions that are activated whenever the actual temperature is 1 C above or below the set point There is a built in delay of fifteen 15 minutes on the occurrence of the audible LOW alarm This prevents the alarm from activating every time the door is opened and the temperature drops Muting Audible Alarm The audible alarm can be muted for a single alarm occurrence by pressing and holding down either the UP or DOWN arrow pad for several seconds until the alarm is muted and the MUTE indicator comes on This means the alarm is muted for that particular condition while it exists but is not muted indefinitely or for a separate condition that may occur CO Supply As stated at the beginning of this section do not connect the CO supply to the incubator until the temperatures have been set Use only MEDICAL GRADE CO with an in line 8 5 8 5 9 5 10 5 11 5 12 filter provided with your tubing kit from the tank to the incubator These incubators use CO in small quantities Pre
7. temperature within the chamber Once set point is established allow 24 hours for the temperature to stabilize Calibrating Main Temperature Controller During Main Temperature Calibration it is important that the door not be opened for any reason and the temperature has been stabile at set point for several hours Compare the reference thermometer with the digital display If there is an unacceptable difference put the display into calibrate mode by pressing both the UP and DOWN arrow pads at the same time until the two outside decimal points begin to flash While the decimal points are flashing the display can be changed to match the reference thermometer by pushing the UP or DOWN arrow pads If no adjustments are made within five 5 seconds the display will default back to displaying the temperature in the chamber After the display has restabilized and maintained set point for several hours check the actual temperature again If the reference thermometer does not match the display repeat the calibration Setting High Limit Thermostat With the Main control calibrated and stabile at set point the High Limit needs to be adjusted Previously turned to its maximum position as stated in section 5 1 now turn the control knob counterclockwise just until the SAFETY ACTIVATED indicator light comes on Next turn the control knob clockwise just until the indicator light goes off Then turn the control knob clockwise two 2 of the smallest divisions on its
8. 2 1 COztank empty 2 solenoid failed while closed 3 COecontroller output failed while open 4 COzhose blockage 5 CO filter plugged replace 6 set point is at 0 0 and has not been reset see section 5 10 and 5 11 7 Door is open see section 5 14 1 calibration error clear chamber for 12 hrs and confirm at 0 2 CO sensor interface or controller failure call Customer Service 1 confirm that fan is working 2 poor door seal check 3 electronic problem with CO sensor interface or controller call Customer Service 4 top of unit exposed to cold air drafts verify room conditions 5 unit being operated without shadow box cover 6 incubator too heavily loaded redistribute shelf load 1 turn unit off then on to reset processor in controller 2 if repeatedly happens call Customer Service 1 leak in plumbing including between regulator and CO2 tank check tubing 2 door being opened too often 13 Won t hold calibration CO2 analyzer reading varies but display stable 1 atmospheric pressure fluctuations 2 top of unit exposed to cold air drafts 3 unit being operated without shadow box cover in place 4 condensation collecting on COz sensor 5 COzsensor or interface failure 6 unit incorrectly calibrated see section 5 11 7 taking CO2 Analyzer reading too soon after the door has been opened 8 air leak around CO2 sensor mounting plate MECHANICAL Door not sealing Motor doesn t move
9. 2 1 Indicates that you should consult your manual for further 9 description or discussion of a control or user item 2 2 4 Indicates Temperature 2 3 De Indicates Over Temperature Safety 2 4 C Indicates Degrees Centigrade 2 5 CO2 Indicates Carbon Dioxide 2 6 o Indicates Gas CO for this unit 27 NS Indicates AC Power On Indicates Unit should be recycled Not disposed of in land fill INSTALLATION Local city county or other ordinances may govern the use of this equipment If you have any questions about local requirements please contact the appropriate local agency Installation may be performed by the end user It is unnecessary for this unit to be installed by a technician Under normal circumstances this unit is intended for use indoors at room temperatures between 15 and 30 C at no greater than 80 Relative Humidity at 25 C and with a supply voltage that does not vary by more than 10 Customer service should be contacted for operating conditions outside of these limits 3 1 3 2 3 3 3 4 3 5 3 6 Power Source The power supply must be properly grounded earthed and correctly sized to match the unit data plate rating VOLTAGE SHOULD NOT VARY MORE THAN 10 FROM THE DATA PLATE RATING These units are intended for a 50 60 Hz application If supplied with a detachable cord set plug the female end into the inlet on the unit and the male plug into the supply Assure that units requiring
10. ARE BETWEEN kA ERA SHELVING TO ALLOW FOR PROPER ATR FLOW Figure 1 CONTROL PANEL OVERVIEW 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 v CO INCUBATOR Sens maten Matter me Power Switch The main power l O On Off switch on the panel controls all the power to the incubator It must be in the l On position before any systems are operational Main Temperature Controller Marked C this controller contains the digital temperature display UP and DOWN arrow pads HIGH and LOW alarm indicators and an alarm MUTE indicator A Digital Temperature Display indicates the actual temperature within the chamber to 1 C B UP and DOWN Arrow Pads are used for inputting the set point calibrating the display and muting or unmuting the audible alarm C HIGH and LOW Alarm Indicators will light whenever there is an alarm condition associated with the temperature within the incubator D Alarm MUTE Indicator will light whenever the audible alarm has been muted Heating This pilot lamp is on whenever the temperature controller is energizing the heating element The element will go on and off as heat is needed to maintain the set point temperature High Limit Thermostat Marked SET HIGH LIMIT the High Limit Thermostat is completely independent of the Main Temperature Controller and functions as an override control If at any time the Main Temperature Control fails in the On position the chamber temperature is then limited to the Hig
11. Motor makes noise Solenoid valve buzzing 1 check physical condition of gasket 2 confirm that door latch pulls door in tightly 3 assure that gasket is in original location if shaft rubs or is frozen call Customer Service 1 Make sure that the fan or blower wheel is not contacting its housing Adjust the motor mounting bracket position to re center the fan or blower wheel if necessary 2 Check the fan or blower wheel for damage or out of balance condition Replace the fan or blower wheel if it is damaged or out of balance 3 Turn the motor shaft to make sure that it spins freely If it binds or the bearings make a rubbing or scrapping sound then replace the motor Call Customer Service OTHER Controller on at all times locked up Front panel displays are all off Unit or wall fuse circuit breaker is blown Unit will not turn on Unit is smoking Out of box Contamination in chamber 1 turn unit off and on to reset 2 if cannot change any condition on the front panel call Customer Service 1 Check power to unit call Customer Service check wall power source 1 check wall power source 2 check fuse circuit breaker on unit or in wall 3 see if unit is on e g fan or heater and just controller is off 4 check all wiring connections esp around the on off switch Put unit under vent and run at full power for one hour 1 see cleaning procedure in operator s manual 2 develop and follow Standar
12. aken CO Alarms The CO controller has visual audible alarm indicators for HIGH and LOW conditions that are activated whenever the actual CO2 content is 1 above or below the set point There is a built in delay of fifteen 15 minutes on the occurrence of the LOW audible alarm This prevents the alarm from activating every time the door is opened and the CO content drops See Section 5 6 for MUTING the audible alarm Accessory Outlets There are four 4 outlets inside the chamber for use with equipment not exceeding 1 amp Note that equipment in the chamber may provide additional heat that could affect the temperature range of the incubator It is recommended that testing be done with the incubator and any additional equipment to insure that the desired operating conditions can be met This incubator comes equipped with a 4 20mA board and interface to facilitate communication with an in house monitoring system The use of the 4 20mA feature will vary depending on the facility requirements and configuration If you have any questions about the use of this feature in your application please email our technical service department at tech shellab com or call us at 1 800 322 4897 The values for the conversion are located on the specification page of this manual CAUTION this incubator is capable of safely operating at conditions that might otherwise damage certain accessory equipment Make absolutely certain your accessory equipment is capable of
13. ate training before attempting to put the unit in service NOTE This equipment must be used for its intended application any alterations or modifications will void your warranty 1 1 1 2 1 3 1 4 Inspection The carrier when accepting shipment also accepts responsibility for safe delivery and is liable for loss or damage claims On delivery inspect for visible exterior damage note and describe on the freight bill any damage found and enter your claim on the form supplied by the carrier Inspect for concealed loss or damage on the unit itself both interior and exterior If any the carrier will arrange for official inspection to substantiate your claim Save the shipping crate until you are sure the unit has been delivered in good condition Return Shipment If for any reason you must return the unit contact your customer service representative for return authorization and supply data plate information Please see the manual cover for information on where to reach customer service Make sure that all of the equipment indicated on the packing slip is included with the unit Carefully check all packaging before discarding These units are equipped with 6 shelves 24 shelf clips CO2 tubing kit and 4 adjustable feet GRAPHIC SYMBOLS Your incubator has been provided with a display of graphic symbols on the control panel which is designed to help in identifying the use and function of the available user adjustable components
14. cise metering of input is vital for maximum performance and only a two stage CO pressure regulator is recommended Note that some single stage CO pressure regulators have two 2 gauges be certain you are using only a two stage requlator CO Regulator The high pressure stage of the regulator coming direct from the supply tank must have a range from 0 to at least 2000 PSI actual tank pressure as read on the gauge The low pressure stage should have a range from 0 to at least 40 PSI The low pressure gauge indicates actual CO2 pressure into the incubator Connect the CO supply from the low pressure stage of the regulator to the 3 8 inlet fitting on the left side of the unit marked CO2 TO CHAMBER CAUTION CO pressure to the incubator inlet is rated from 15 to 20 PSI DO NOT exceed 20 PSI CO Principle of Operation The microprocessor CO control system interprets the information from the CO sensor displays the CO2 concentration directly on the digital display reads the set point and controls the percentage of CO in the incubator chamber The infrared IR sensor operates under the principle that a certain frequency of infrared light is absorbed by CO The more CO present in the chamber the more light is absorbed The IR sensor is only sensitive to CO so its accuracy is consistent no matter what the conditions are in the incubator Setting CO Controller To set the CO percent you desire press either the UP or DOWN arrow
15. d operating procedure for specific application include definition of cleaning technique and maintenance schedule 14 PARTS LIST Description Blower Motor CO2 Control CO2 Sensor CO2 Solenoid C02 Filter Hepa Convenience Outlet Door Switch Heating Element High Limit Thermostat I O Switch Pilot Light Green Pilot Light Red Power Cord Temperature Control Transformer 120VAC 12VDC 15 UNIT SPECIFICATION SCO31 SCO31 2 660 Ibs 610 Ibs 2428 2428 2 2440 2440 2 Exterior WxDxH Exterior WxDxH in Interior WxDxH in SCO31 SCO31 2 m 2428 2428 2 SCO40 SCO40 2 m 2440 2440 2 Temperature Range Uniformity Stability SCO31 SCO31 2 2428 2428 2 SCO40 SCO40 2 2440 2440 2 Amb 8 to 60 C 5 C O 37 1 C Amb 8 to 60 C 5 C O 37 1 C 4 TO 20mA Board Conversions CO2 4mA 0 CO2 CO2 20mA 20 CO2 Temperature 4mA 0 Celsius Temperature 20mA 70 Celsius 16 PLUMBING DIAGRAM 02 INLET TO y INNER CHAMBER An 02 RESTRICTOR d 602 INJECTION ap SOLENOID VALVE 02 INLET ON le C02 SAMPLE TO INNER CHAMBER i 02 SAMPLE INLET LE 9850869 17 WIRE DIAGRAM Domestic International 115V 230V PLUG STYLES PLUG STYLES NEMA 5 ISP NEMA BEAR ELI1 18P UK1 13P a D 2j sa CEN we e tg Cp i i EE rij INLE _ CIRCUIT
16. h Limit Thermostat set point which is manually set approximately 1 C above the Main Controllers set point Note that the HEATING indicator will continue to function under the control of the High Limit Thermostat It is not recommended that the unit be allowed to operate for an extended period of time using the High Limit to control temperature as temperature uniformity will suffer Safety Activated This pilot lamp is on whenever the High Limit Thermostat has taken control of the incubator and shut down the elements Under normal operating conditions this pilot lamp should never be on CO Sample Port Chamber atmosphere can be taken from the Sample Port at the upper front corner on the left side of the chamber CO concentration can then be checked using a FYRITE gas analyzer or other instrument such as a gas chromatograph CO Controller Marked CO this controller contains the digital CO2 display UP and DOWN arrow pads HIGH and LOW alarm indicators and alarm MUTE indicator A Digital CO Display indicates the CO content within the incubator chamber to 1 B UP and DOWN Arrow Pads are used for inputting the set point calibrating the display and muting or unmuting the audible alarm C HIGH and LOW Alarm Indicators will light whenever there is an alarm condition associated with the CO2 within the incubator chamber D Alarm Mute Indicator will light whenever the audible alarm has been muted Injection This pilot lamp is on
17. maximum accuracy calibration should be done at or as close to the set point temperature CO2 LEVEL Overshoots set point but stabilizes display and CO analyzer match 12 Overshoots set point and continues to rise display and Fyrite match Rises very slowly Never rises Display and CO Analyzer reading do not match Is unstable display or actual reading varies around set point Can t adjust set points or calibration locked up Feeding continuously or abnormally high CO2 usage 1 turn set point up and down to see if solenoid valve works by feeling and listening to valve 2 recalibrate with CO analyzer see section 5 11 and section 6 0 3 fan not operating correctly call Customer Service 5 tank pressure too high see section 5 8 8 incubator too heavily loaded redistribute samples on shelves 9 incubator being operated without shelving 10 CO attached to sample port instead of CO IN fitting 1 debris in solenoid causing it to leak continuously call Customer Service 4 controller output failed or shorted call Customer Service 5 CO2 sensor or interface failure call Customer Service 6 CO sensor plugged by debris or condensation call Customer Service 1 restrictor partially plugged 2 filter overly dirty or partially plugged 3 CO tank regulator set too low see section 5 8 4 hose kinked or leaking 5 poor door seal 6 CO tank contains mixed gas not 100 medical grade CO
18. on 5 4 2 controller set too low see section 5 2 3 unit not recovered from door opening wait for display to stop changing 4 unit not recovered from power failure or being turned off incubators will need 24 hours to warm up and stabilize 5 element failure see if heating light is on call Customer Service 6 controller failure confirm with front panel lights that controller is calling for heat 7 high limit failure confirm with front panel lights that it is operating correctly 8 wiring problem check all functions and compare wiring to diagram in section 8 0 especially around any areas recently worked on if ambient room temperature is lower than range of unit compare set points and ambient temperature to rated specifications in section 8 0 11 Unit will not heat up at all Indicated chamber temperature unstable Will not maintain set point Display and reference thermometer don t match Can t adjust set points or calibration Calibrated at one temperature but not at another 1 check fan motor motion in shadow box and feel for air movement in chamber if not call Customer Service 2 confirm that set point is set high enough turn High Limit counter clockwise and see if heating light or safety light comes on 3 check calibration using independent certified reference thermometer follow instructions in sections 5 1 and 5 3 1 verify that controller is asking for heat by looking fo
19. r controller light if pilot light is not on continuously there is a problem with the controller call Customer Service 2 do all controller functions work 3 is the High Limit set high enough for diagnostics should be fully clockwise with the pilot light never on 4 has the fuse circuit breaker blown 1 0 1 may be normal 2 is fan working if not call Customer Service 3 is ambient room temperature radically changing either door opening or room airflow from heaters or air conditioning stabilize ambient conditions 4 calibration sensitivity call Customer Service 5 high limit set too low be sure that High Limit set point is more than 5 degrees over desired Main set point check if High Limit pilot is on continuously turn controller knob completely clockwise to see if problem solved then follow instructions in section 5 4 for correct setting 1 assure that set point is at least 5 degrees over ambient room temperature 2 see if ambient is fluctuating 1 calibration error see section 5 3 2 temperature sensor failure evaluate if pilot light is operating correctly 3 controller failure evaluate if pilot light is operating correctly 4 allow at least two hours to stabilize 5 verify that reference thermometer is certified 1 turn entire unit off and on to reset 2 if repeatedly happens call Customer Service This can be a normal condition when operating temperature varies widely For
20. r on the tank impurities in the tank or impurities in the solenoid valve Replace the CO in line filter 2800525 every six 6 months or when the filter has become noticeably dirty on the upstream side There is no maintenance required on electrical components If the unit fails to operate as specified see Section 7 0 Troubleshooting before calling for service If technical assistance is required see the manual cover for information on where to reach customer service 10 TROUBLESHOOTING The incubator is designed so that no internal electrical servicing should be requires under normal conditions If electrical servicing is necessary it should be performed by qualified service personnel FOR PERSONAL SAFETY ALWAYS DISCONNECT THE POWER BEFORE SERVICING Always make a visual inspection of the incubator and control console when troubleshooting Look for loos source of the trouble e or disconnected wires or tubing which may be the TEMPERATURE Temperature too high Display reads HI or 400 Chamber temp spikes over set point and then settles to set point Temperature too low Display reads LO Unit will not heat over a temperature that is below set point 1 controller set too high see section 5 2 2 controller failed on call Customer Service 3 wiring error call Customer Service probe is unplugged call Customer Service recalibrate see section 5 3 1 high limit set too low see secti
21. t the foot at each corner until the unit stands level and solid without rocking Cleaning The unit chamber should be cleaned and sterilized prior to operating Use a suitable disinfectant that is appropriate to your application DO NOT USE chlorine based bleaches or abrasives as this will damage the interior chamber DO NOT USE spray cleaners that might leak through openings and cracks and get on electrical parts or that may contain solvents that will harm the coatings Special care should be taken when cleaning around sensors to prevent damage Warning Never clean the unit with alcohol or flammable cleaners with the unit connected to the electrical supply Always disconnect the unit from the electrical service when cleaning and assure all volatile or flammable cleaners are evaporated and dry before reattaching the unit to the power supply Shelves and Interior Parts Shelving and clips are supplied with the unit See Figure 1 SHELF STANDARD gt SHELF 4 CLIPS PER SHELF ASSURE ALL CLIPS ARE ON A LEVEL PLANE a A PROJECTION HOLOS SHELF SECURE INSTALL CLIPS AS SHOWN CLIPS MAY NEED TO BE TIPPED INTO THE TOP SLOT PINCHED TOGETHER AND THEN ROTATED INTO BOTTOM SLOT SHELF STANDARDS ARE ALONG BOTH WALLS FRONT AND BACK NOTE THAT LOUVERS
22. whenever the CO controller is injecting CO into the incubator chamber Note that there is a rocker switch located at the base of the control panel and just above the door The door when opened trips the switch and disengages injection of CO2 This is an added feature that saves consumption of gas while loading unloading the chamber OPERATION Read this section in its entirety before attempting operation Connect service cord to grounded outlet Set temperatures before connecting CO supply to the incubator 5 1 5 2 5 3 5 4 5 5 5 6 5 7 Getting Started Turn the High Limit Thermostat to its maximum position clockwise An accurate reference thermometer should be used inside the chamber when setting and calibrating the incubator temperature Be certain that the thermometer can be easily viewed through the glass door and is not touching any shelves or chamber walls as this will give an inaccurate reading Taping the thermometer to a petri dish is a method that works well for this Setting Main Temperature Controller Enter desired set point To set temperature on the control press either the UP or DOWN arrow pad until the digital display begins to blink from bright to dim While blinking the display is showing the current set point which can be changed by pushing the UP and DOWN arrow pads until the desired value is reached If no adjustments are made within five 5 seconds the controller will default back to displaying the
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