Series 657 Relative Humidity/Temperature Transmitter
Dual Channel Design for Simultaneous 4-20 mA Output Signals
The Series 657 Relative Humidity/Temperature Transmitters provide two 4-20 mA channels to produce separate output signals for both relative humidity and temperature. These devices deliver ±2% accuracy for humidity and ±1°F for temperature measurements. Stainless steel probe can be easily mounted to most ductwork using either of the two optional kits below.
*NOTE: The configurator is only available for the Series 657C.
Product Applications
- Cleanroom monitoring
- HVAC/building control monitoring
Starting at $367.10
Specifications
- Service:
- Dry clean air.
- Range:
- Relative humidity: 0 to 100%; Temperature: 32 to 212°F (0 to 100°C).
- Accuracy:
- Relative humidity: ±2% (10 to 90% RH), ±3% (0 to 10% and 90 to 100% RH); Temperature ±1°F (0.5°C).
- Temperature Limits:
- 32 to 140°F (0 to 60°C).
- Pressure Limits:
- 1 psi (0.7 bar).
- Compensated Temperature Range:
- 32 to 140°F (0 to 60°C).
- Power Requirements:
- 10-35 VDC.
- Output Signal:
- 2 channels each 4-20 mA. Loop powered on the RH channel.
- Electrical Connections:
- 4 screw type terminals.
- Mounting Orientation::
- Mount in any position.
- Probe:
- 657-1: SS 5/16" x 10" (0.8 x 25.4 cm); 657C-1: 5/16˝ x 9-1/10˝ (0.8 x 23.1cm).
- Weight:
- 657-1: 5.5 oz (156 g); 657C-1: 10 oz (284 g).
Product Literature
Manuals
Catalog Pages
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| Model | Description | Availability* | Price | |
|---|---|---|---|---|
| A-159 | Mounting gland. Versatile adapter slips on any Series 160, 5/16" standard pitot tube made after Dec. 1990. Two-part stainless steel fitting slides over tube and provides permanent, secure mounting. Where duct interior is accessible, use the washers and jam nut supplied. For blind applications or in thicker materials, use model A-156 flange mounting plate. Once tube is adjusted to proper depth and angle, tighten smaller hex bushing to lock position. Graphite bushing inside assures leak-proof seal even at higher temperatures. TFE bushing also available. Note: For full insertion with this fitting, order next longer pitot tube. A-159 mounting gland is used for both duct mounting and flange mounting. | 1-3 days* |
$37.40 |
|
| A-158 | Split flange mounting. Can be added to any Dwyer® No. 160 standard pitot tube. Zinc plated steel. Gasket is pattern for mounting holes. Secure flange loosely to tube, adjust tube depth and tighten screws. Gasket of 1/16" Neoprene fits tightly around tube and against duct for leak-proof seal. Nuts, washers included. | 1-3 days* |
$19.10 |