TG

Sealed aquastats (e.g., THG60010) are housed in an IP55-rated enclosure, protecting internal contacts and adjustment mechanisms from moisture and dust ingress; suitable for washdown or damp environments. Open-capillary models (e.g., THG67005, THG45008) expose the adjustment mechanism and require drier installation conditions. Sealed variants are specified when environmental contamination or washdown cycles are present; open designs are standard in controlled plant rooms.

Capillary length determines the sensing-bulb distance from the control body. TG offers 1 m, 1.5 m, and 3 m lengths. Select based on the physical distance between the sensing point (e.g., boiler outlet pipe) and the control location (e.g., plant room wall). Longer capillaries (3 m) suit remote tank or duct installations; shorter lengths (1 m) are standard for compact boiler packages. Stainless-steel capillaries (THG60010) provide corrosion resistance in aggressive environments.

Manual reset (e.g., THG70002) requires an operator to physically reset the thermostat after a temperature cutout event; the device does not re-engage automatically. This is mandated for boiler safety limit controls to ensure operator awareness of an overheat condition. Automatic-reset models (THG45008) re-engage when temperature drops below setpoint and are used for comfort or process limits where downtime is acceptable.

Most TG thermostats (e.g., THG70002) carry 16 A at 250V contacts, rated for resistive loads. This drives relay or contactor selection if higher currents or DC loads are required. Engineers must confirm contact rating matches the load circuit; oversizing the thermostat contact for inductive or motor loads requires an intermediate relay. Consult the specific SKU datasheet for exact amperage and voltage limits.

No. TG rectangular thermometers are passive display devices with no electrical contacts or switching capability. They provide direct visual temperature indication for operator monitoring only. For alarm or control, use TG aquastats or sealed thermostats with contact ratings and setpoint adjustment. Thermometers are complementary instruments for cross-checking sensor performance.

TG aquastats specify setpoint tolerance (e.g., ±0/−6°C on THG70002, +3°C/−2°C on THG60008) and differential range (e.g., 2±1°C to 45°C depending on model). Differential is the temperature drop between on and off, critical for preventing chatter and controlling system hysteresis. Tighter differentials suit process control; wider differentials (20–45°C) are typical for boiler safety limits. Check the SKU specifications for your application's stability requirements.