Honeywell 50021579-001, T775-SENS-WR, T775-SENS-WT, T775-SENS-OAT Temperature Sensors for the T775 Series User Guide
Honeywell 50021579-001, T775-SENS-WR, T775-SENS-WT, T775-SENS-OAT Temperature Sensors for the T775 Series
DESCRIPTION
The T775 temperature sensors are 1097 Ohm sensors for use with the T775 Series 2000 electronic standalone controller in commercial heating and cooling applications.
NOTE: See the T775 Series 2000 Spec Data sheet (63-1318) for a complete list of compatible devices.
FEATURES
- Fast response time and highly accurate
- 1/2 in. (6.35 mm) stainless steel probe with a thermally conductive epoxy
- All sensors are 1,097 Ohms PTC at 77°F (25°C)
- The 50021579-001 is a standard temperature sensor for indoor applications
- The T775-SENS-WR is a water resistant sensor with 5 ft leads
- The T775-SENS-WT is a water tight sensor with 6 ft leads
- The T775-SENS-OAT is for sensing outdoor air temperature and is housed in a weatherproof case for outdoor use (knockouts allow for 1/2 in. conduit connection)
- Two year warranty
APPLICATIONS
Some typical applications for the 50021579-001 and T775-SENS-WT/-WR sensors include:
- Monitoring return air temperatures
- Monitoring discharge air temperatures
- Monitoring mixed air temperatures
Use the T775-SENS-OAT to measure outside air temperature.
SPECIFICATIONS
- Probe Dimensions: See Figures 1 through 4
- Operating temperature range: 50021571-001: -40 F to 350 F (-40C to 177C) Short term spikes to 392F (200C) okay.
- T775-SENS-WR and T775-SENS-WT: -40F to 270F (-40C to 132C)
- T775-SENS-OAT: -40F to 158F (-40C to 70C)
- Accuracy: Meets DIN-IEC-751 Class A standards for overall accuracy of ± 0.06% at 32°F (0°C)
- Self Heating Coefficient: 4 mW/C (Measured in air with velocity of 1m/sec.)
- Response Time: Air (Velocity = 1 m/s) = 15 sec. max.
- Temperature Coefficient: 3,850 ppm/C
- Environmental Compliance: RoHS-Directive 2002/95/EC
- Applied Current: 1.0 mA Max.
- Sensor Output: 1 K Ohms at 32 F (0 C)
- Approvals: RoHS: Compliant
Sensor Resistance vs. Temperature
Figure 1 show how sensor resistance varies with temperature for a sensor having a positive temperature coefficient (PTC) or 2.1 Ohms per degree F (3.85 Ohms per degree C).
OTHER COMPATIBLE T775 SENSORS
There are a number of other temperature, humidity, and differential pressure sensors that are compatible with the T775 electronic stand-alone controller. The table below shows compatible temperature sensors. See the T775 Specification Data for a full list of compatible sensors (63-1318).
Product Number |
Description |
Application |
More Info |
C7031D2003 |
5 in. immersion sensor (well included, 5001774-001) |
Hot or chilled water | Form no. 63-2590 |
C7031B2005 |
6 inch duct sensor with wiring box | Duct Air | Form no. 63-2590 |
C7031J2009 |
12 ft duct averaging sensor with four elements | Duct discharge air | Form no. 63-2590 |
C7046D1008 |
8 in. duct probe with mounting flange | Duct discharge air mounts on flat duct or plenum surface | Form no. 60-2350 |
C7100D1001 |
12 in. flat response, duct averaging sensor with flange | Averaging duct discharge air for use in troubleshooting | Form no. 60-2521 |
C7130B1009 |
Room mount sensor | Wall mount air temperature sensor | Form no. 63-2044 |
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
- Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
- Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
Dimension Drawings
- 50021579-001 dimensions in inches (mm)
- T775-SENS-WR dimensions in inches (mm)
- T775-SENS-WT dimensions in inches (mm)
- T775-SENS-OAT dimensions in inches (mm)
INSTALLATION
The 50021579-001 and T775-SENS-WR/WT remote probe temperature sensors are single point temperature sensors with Stainless Steel (304 Series) probes. Use care when installing the probes. Pay attention not to kink the cable, especially on the 5 ft units. The red/black wires should be securely connected to the controller. The probe must be strapped tightly to the pipe, duct, or device that is being monitored. A loose attachment could affect the accuracy. To ensure good contact, thermal grease is recommended. Insulating the sensor will help the overall accuracy. When installing the T775-SENS-WR sensor (5 ft cable), it may be necessary to wire tie the cable, depending upon the application.
TROUBLESHOOTING
If… |
Then… |
| Sensor reads 0 ohms or very low | Sensor or wires are shorted together Verify that (2) leads are not shorted to the probe. |
| Sensor reads infinity or very high | Sensor or wires are cut or open |
| Erratic readings | Bad wire connections – Condensation or Moisture problem |
| Inaccurate Sensor | If you suspect that the sensor is not reading within the specified tolerance, disconnect the sensor wires from the Building Management System (DDC Controller) and attach a NIST traceable ohmmeter across the two wires. Compare the reading to the table listed below. If you feel that the sensor is different from the table below please contact ACI for further assistance. |
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