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Technical Data | Installation & Operation | Ordering Data | Downloads | Back
We have engineered our duct probe to ensure long life, rapid response and to prevent heat loss from leaks. The sensor is mounted using PC board technology to eliminate strain on the sensor leads, increasing reliability. This assembly is potted in heat transfer compound to provide rapid response and protection from vibration.
Our molded case with hinged cover is easy to install. The cover is fastened with one captive screw. Provision is made for a front identification tag. The back is completely smooth so it fits flush against the mounting surface. Circuit board slots inside are designed to accept a 2-wire transmitter if required.
Duct Air Temperature Sensors - 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.
Our standard RTD uses a 100 ohm thin film element to DIN 43 760 (IEC 751) with a tolerance of 0.3°C. We also supply thin film RTD's with a tolerance of ± 0.1°C or 0.05% in values of 100, 500 and 1000 ohms.
Wire wound ceramic RTD's with accuracies as high as ± 0.06°C or 0.025% are in stock for high precision applications.
NTC Thermistors are the most sensitive sensors known for temperature measurement from -50°C to +150°C.
The temperature coefficient of thermistors 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 system accuracy.
Since thermistors are semiconductors they must not be exposed to temperatures near their maximum operating limits or they can drift out of specified tolerance.
Our standard thermistor has a 10K resistance at 25°C and a tolerance of ± 0.2°C. On request other calibrations and accuracies are available.
Duct Air Temperature Sensors - Installation & Operation
Temperature Sensors
InstallationDrill a hole in the duct large enough for the 1/4" sheath. The case should be mounted to the duct with two sheet metal screws. You will need a driver that is at least 3" long to reach to the bottom of the case. These drivers are available from Enercorp on request. 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.
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 itıs temperature range or mechanical causes. Damaged sensors can not be repaired and must be replaced.
RTD Temperature Transmitters
InstallationDrill a hole in the duct large enough for the 1/4" sheath. The case should be mounted to the duct with two sheet metal screws. All Enercorp RTD temperature transmitters are unaffected by position, are reverse polarity protected and supplied with a two pole terminal strip. All other versions are supplied with 22 awg leads.
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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| TS-D-( | stem length in inches | )-( | sensor type | )-( | sensor value | ) |
| R = RTD | 100=100 ohms | |||||
| T = Thermistor | 10k=10k ohms |
e.g. TS-D-12-T-10K Duct sensor, 12" long with 10K thermistor
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