Dwyer Series THC

The unit offers 61 programmable parameters for temperature and humidity control including set point, differential, direct/reverse acting, cycle time, alarm clock time, and decimal point adjustment. In the event of a probe error, the default operation of the relays can be set to open or close. The THC features error or alarm messaging and password protection.


The THC Temperature/Humidity Switch accepts up to two temperature probe inputs (sold separately) and a humidity sensor. A humidity sensor with 0-1V, 0-3V (sold separately), or 4-20 mA output can be used with the Series THC.


Measurement Range: Temperature: -58 to 302°F (-50 to 150°C); Humidity: 10 to 100% RH.

Input: Up to 2 thermistors and 1 humidity sensor.

Output: 4 SPST, 8A relays @ 250 VAC.

Horsepower Rating (HP): 1/3 HP.

Control Type: On/Off direction, direct or reverse acting, neutral.

Power Requirements: 110 or 230 VAC (depending on model).

Accuracy: Temperature: ±0.5% of probe range; Humidity: ±3% (20 to 80%) of range.

Display: Two 3-digit displays. 1/2″ digits.

Resolution: 0.1°.

Memory Backup: Nonvolatile memory.

Ambient Operating Temperature: 32 to 158°F (0 to 70°C).

Storage Temperature: -4 to 176°F (-20 t 80°C).

Weight: 1.17 lb (530 g).

Panel Cutout: 5.15″ x 2.37″ (131 x 111 mm).

Front Panel Protection: IP64.

Agency Approvals: CE.