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OPERATION AND MEASUREMENT

VERY IMPORTANT:

Apogee changed all wiring colors of our bare-lead sensors in March 2018. To ensure

proper connection to your data device, please note your serial number then use the appropriate wiring
configuration below.

Wiring for ST-100 Serial Numbers 2725 and above, ST-110 Serial Numbers 2725 and above, and ST-200 Serial
Numbers 1352 and above

Wiring for ST-100 Serial Numbers range 0-2724, ST-110 Serial Numbers range 0-2724, and ST-200 Serial Numbers
range 0-1351

Plug each wire into the appropriate data logger terminal following the illustrations below:

Blue: Analog Ground (negative thermistor lead)

Red: Excitation Channel (excitation for thermistor)

Black: Single-ended channel (positive thermistor lead)

Clear: Ground (shield wire)

White: Single-ended channel (positive thermistor lead)

Red: Excitation channel (excitation for thermistor)

Black: Ground (negative thermistor lead)

Clear: Shield/Ground

Содержание ST-100

Страница 1: ...EST 1800 NORTH LOGAN UTAH 84321 USA TEL 435 792 4700 FAX 435 787 8268 WEB APOGEEINSTRUMENTS COM Copyright 2021 Apogee Instruments Inc OWNER S MANUAL TEMPERATURE SENSORS Models ST 100 ST 110 ST 150 ST 200 and ST 300 Rev 14 Apr 2021 ...

Страница 2: ...ontents 2 Certificate of Compliance 3 Introduction 4 Sensor Models 5 Specifications 6 Deployment and Installation 8 Operation and Measurement 9 Maintenance and Recalibration 14 Troubleshooting and Customer Support 15 Return and Warranty Policy 17 ...

Страница 3: ...assessment of electrical and electronic products with respect to the restriction of hazardous substances Please be advised that based on the information available to us from our raw material suppliers the products manufactured by us do not contain as intentional additives any of the restricted materials including lead see note below mercury cadmium hexavalent chromium polybrominated biphenyls PBB ...

Страница 4: ...the sensor to a measurement device ST 110 sensors are weatherproof have excellent long term stability but do not offer the same level of ingress protection as the ST 100 The ST 110 is designed for continuous air temperature measurement when housed in the TS 100 aspirated radiation shield Thermal conductivity to the precision thermistor is minimized by using constantan wire which has twenty fold lo...

Страница 5: ...sensor is designed for use inside the Apogee fan aspirated radiation shield model TS 100 The ST 150 PRT temperature sensor is an accurate and durable sensor for use in all applications including air temperature measurements in the TS 100 The ST 300 PRT temperature sensor is a highly accurate 1 10 DIN and durable sensor for use in all applications including for air temperature measurements in the T...

Страница 6: ... than 0 003 C typical assuming pulsed excitation of 2 1 V DC Operating Environment 60 to 80 C 0 to 100 relative humidity Input Voltage Requirement 2 5 V DC excitation recommended see OPERATION AND MEASUREMENT section Datalogger dependent 2 1 V DC Output Voltage Range 0 to 2 5 V DC assuming input excitation of 2 5 V DC Datalogger dependent 16 to 27 mV DC assuming input excitation of 2 1 V DC Curren...

Страница 7: ...ed to ensure accuracy Sensors are compared for absolute temperature against the mean of two reference PRTs in a constant temperature bath over a range of approximately 35 to 60 C The reference PRT calibrations are directly traceable to NIST Accuracy for multiple classifications of PRTs across a temperature range of 60 to 60 C Temperature tolerance specifications y axis are defined by International...

Страница 8: ...rs must be in thermal contact with the medium of interest Accurate air temperature measurement requires a radiation shield see picture below to minimize the effects of shortwave radiation absorption causes warming occurs during the day and longwave radiation emission causes cooling occurs on clear nights by the sensor Proper ventilation is also required to ensure coupling and thermal equilibrium w...

Страница 9: ... 1352 and above Wiring for ST 100 Serial Numbers range 0 2724 ST 110 Serial Numbers range 0 2724 and ST 200 Serial Numbers range 0 1351 Plug each wire into the appropriate data logger terminal following the illustrations below Blue Analog Ground negative thermistor lead Red Excitation Channel excitation for thermistor Black Single ended channel positive thermistor lead Clear Ground shield wire Whi...

Страница 10: ...rease thermistor measurement sensitivity Increasing the excitation voltage will increase thermistor measurement sensitivity but will also increase self heating and current drain Conversion of Thermistor Resistance to Temperature The thermistor is a resistive element where resistance changes with temperature Thermistor resistance RT in Ω is measured with a half bridge measurement requiring a known ...

Страница 11: ...lead wires voltage is measured across the other two lead wires using a differential measurement and resistance of the PRT is calculated by dividing the measured voltage by the excitation current Ohm s Law Current does not flow in the wires where voltage is measured so resistance of the lead wires does not influence the measurement Temperature of the PRT is calculated from resistance using equation...

Страница 12: ...in March 2018 To ensure proper connection to your data device please note your serial number then use the appropriate wiring configuration below Wiring for ST 300 Serial Numbers 1076 and above Wiring for ST 300 Serial Numbers range 0 1075 White Analog Ground Black Low Side of Differential Channel 2 Green Low Side of Differential Channel 1 Orange PRT Excitation Channel Blue High Side of Differentia...

Страница 13: ...an be used Decreasing the excitation voltage will decrease current drain but will also decrease output voltage Increasing the excitation voltage will increase output voltage but will also increase current drain Conversion of PRT Resistance to Temperature The PRT is a resistive element where resistance changes with temperature PRT resistance RPRT in Ω is measured with a half bridge measurement requ...

Страница 14: ...e sensors are weatherproof and can be submerged in water or buried in soil porous media ST 110 sensors are weatherproof and designed for air temperature measurements inside radiation shields ST 200 series sensors are weather resistant but not weatherproof When sensors are not in use it is recommended that they be removed from the measurement environment cleaned and stored ST series temperature sen...

Страница 15: ...ck and white wires from the sensor The resistance should read 100 Ω and should not vary Connect the lead wires of the ohmmeter to the white and red wires from the sensor The resistance should read 10 kΩ and should not vary Connect the lead wires of the ohmmeter to the blue yellow and red wires from the sensor The resistance should be the sum of the resistances measured across the blue yellow and g...

Страница 16: ...ng up to 100 m of cable See Apogee webpage for details on how to extend sensor cable length http www apogeeinstruments com how to make a weatherproof cable splice For cable extensions shielded twisted pair cable is recommended in order to minimize electromagnetic interference This is particularly important for long lead lengths in electromagnetically noisy environments The precision bridge resisto...

Страница 17: ...r factory The warranty does not cover equipment that has been damaged due to the following conditions 1 Improper installation or abuse 2 Operation of the instrument outside of its specified operating range 3 Natural occurrences such as lightning fire etc 4 Unauthorized modification 5 Improper or unauthorized repair Please note that nominal accuracy drift is normal over time Routine recalibration o...

Страница 18: ...anship Apogee Instruments will repair or replace the items free of charge If it is determined that your product is not covered under warranty you will be informed and given an estimated repair replacement cost PRODUCTS BEYOND THE WARRANTY PERIOD For issues with sensors beyond the warranty period please contact Apogee at techsupport apogeeinstruments com to discuss repair or replacement options OTH...

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