Thermatel? TG1/TG2 Series Flow/Level/Interface Switch

Product Description:

Thermatel? TG1/TG2 provides a two-wire intrinsically safe circuit between the probe and a remotely mounted DIN rail enclosure. This flow/level/interface switch delivers a new level of performance and reliability not previously available in earlier switches. Featuring continuous diagnostics with fault indication, narrow hysteresis, and fast response time...

Applications:

Chemical, crude oil processing, natural gas processing, nuclear power, water and wastewater treatment, nuclear power, power generation, etc.

Features:

(1) Simple field calibration - factory pre-calibrated upon request;

(2) Detection of flow changes in gas and liquid, as well as flow vs. no-flow conditions;

(3) Excellent low-flow sensitivity;

(4) Continuous diagnostics detect sensor faults;

(5) mA output provides repeatable indication of flow rate and failure detection;

(6) Process conditions up to +850°F (+450°C) and 6000 psi (413 bar).

Working Principle:

(1) The THERMATEL sensor contains two RTD elements. One serves as a reference, and the second is heated to a temperature above the process temperature. The electronics detect the temperature difference between the two elements. The temperature difference is greatest in air and decreases as cooling occurs due to changes in the medium. Increased flow further reduces the temperature difference.

(2) The setpoint is adjusted to trigger an alarm at the desired temperature difference. Once the setpoint is reached, the relay changes state.