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Immersion Temperature Sensors, Probes
Fast response with spring loading
This probe is used to measure the temperature of fluids or gases in pipes. We spring load these probes to provide a good thermal contact with the base of the mating thermowell ensuring fast and accurate measurements. The temperature sensor which is PC board mounted for better reliability is potted in heat transfer compound for rapid response and vibration protection. Our molded case with hinged cover is easy to install. It is designed to accept a 2-wire transmitter.
Immersion Temperature Sensors, Probes - Technical Data
Platinum RTD's are the most stable temperature sensors between -50 and 400°C. They show almost no calibration drift with time. Their stability, wide temperature range and almost linear output make them the choice in demanding applications.
NTC Thermistors are the most sensitive sensors known for measurements from -50C to +150°C. Their temperature coefficient can be as high as several percent per degree C. This means that lead resistance from installation of thermistors in remote areas has minimal effect on accuracy.
Retrofit Work
Our step down adaptor model BUSHING-8-W, allows fast and easy retrofitting of new sensors to older systems with installed pipe thermometers or bulb and capillary thermometers. This is a brass step-down bushing to reduce the 1-1/4-18 UNEF thread commonly used on these older systems to the 1/2" NPT thread used by our pipe thermometers. Each is supplied with a brass sleeve to adapt the 1/4" stem to the 0.385 bore of the well.
Immersion Temperature Sensors, Probes - Installation & Operation
Temperature Sensors
InstallationImmersion sensors are provide with a 1/2" male NPT thread for thermowell mounting. The sheath is spring loaded to provide good thermal contact with the bottom of the thermowell. The assembly is not water tight and must be used with a thermowell which should be ordered separately. A conversion fitting, BUSHING-8-W, is available when reusing glass thermometer thermowells. All Enercorp thermistor temperature sensors are unaffected by polarity or position. Units with time over-ride (TOS) or setpoint over-ride (SS) features have labelled terminal blocks. All other versions are supplied with 22 awg leads.
Troubleshooting| Problem | Cause |
| Sensor reads 0 or only a few ohms | Sensor or leads are shorted |
| Sensor reads over full scale or very high | Sensor or leads are open |
| Readings are erratic | Loose connection |
These sensors have no built-in means of calibration. Minor adjustments must be made at the receiving instrument or DDC panel. If an adjustment of more than a degree is required first check your connections. If the connections are good the sensor may have been damaged by operation outside it's temperature range or mechanical causes. Damaged sensors can not be repaired and must be replaced.
RTD Temperature Transmitters
InstallationImmersion sensors are provide with a 1/2" male NPT thread for thermowell mounting. The sheath is spring loaded to provide good thermal contact with the bottom of the thermowell. The assembly is not water tight and must be used with a thermowell which should be ordered separately. All Enercorp RTD temperature transmitters are unaffected by position, are reverse polarity protected and supplied with a two pole terminal strip.
Troubleshooting| Problem | Cause |
| No reading | 1. Lead wires
are reversed 2. No power to board - check voltage is between 13 and 30 VDC |
| Reading too low or too high | 1. RTD wires
shorted or RTD defective. Check that RTD resistance is about 100 ohms +
0.4 ohms/degree C above 0°C. 2. Check for correct transmitter range. 3. Check for condensation or mechanical damage to board. |
| Readings are erratic | Loose connection. Screw down all connections tightly. |
| Calibration
These transmitters have clearly marked zero and span pots. To calibrate connect a precision decade box to the RTD terminals. Since 1 degree Fahrenheit change is equal to a 0.2 ohm change you need a very accurate decade box to calibrate accurately. Insert a DVM set to mA in the 2-wire loop and apply power. With the decade box set to the scale beginning resistance from the table adjust the zero pot to obtain 4 mA. Change the resistance in the decade box to the scale end and adjust the span pot as necessary to obtain 20 mA. Go back and forth until the readings are stable. |
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Immersion Temperature Sensors, Probes - Ordering Data
Order BUSHING-8-W
| TS -P- | ( | thermowell length in inches | ) | - | ( | sensor type | ) | - | ( | sensor value | ) |
| R = RTD | 100 = 100 ohms | ||||||||||
| T = Thermistor | 10K = 10k ohms | ||||||||||
e.g. TS-P-4-T-10K Immersion sensor, for 4" thermowell with 10K thermistor
Immersion Temperature Sensors, Probes - Downloads
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