Krohne introduces the new OPTITEMP TT 51 temperature transmitter. The device was especially designed for use in the chemical industry. In keeping with industry requirements, the transmitter guarantees accurate measurements over the long term and superior reliability. For use in safety-related applications, the OPTITEMP TT 51 features SIL2 approval as per IEC 61508.
Constant measuring accuracy over a long period of time is crucial when it comes to monitoring process temperatures. The OPTITEMP TT 51 features a newly developed electronic system that boasts a long-term measuring error of just 0.05% of the span. Considered over a period of five years, the long-term error is a mere quarter of the drift of comparable temperature transmitters.
The superior reliability of a measuring station equipped with an OPTITEMP TT 51 temperature transmitter can be attributed to more than one principle. The OPTITEMP TT 51 features SmartSense insulation monitoring to detect moisture in the measuring insert. If the measuring insert (and the sensor element) absorbs moisture, the electrical isolation resistance immediately decreases, resulting in a measurement error. This safety risk can thus be quickly detected and eliminated. Even the gradual failing of a sensor, seen in the diminishing isolation resistance, is detected. This allows the measuring inserts affected to be replaced in a timely manner, reducing downtime.
A second, redundant sensor can be connected to the OPTITEMP TT 51 transmitter by way of a dual input. As it is highly unlikely for both sensors to fail at the same time, the reliability of the measuring station increases significantly once again. In addition to the isolation monitoring of both sensors, measurement errors between the sensors can be detected via the integrated sensor drift detection feature. These errors are the result of things like sensor ageing, for example. The sensor can then be replaced accordingly.
The OPTITEMP TT 51 is either mounted directly to the measuring insert (head-mounted transmitter) or it is installed separately in a control cabinet as a rail-mounted transmitter. The head-mounted version is particularly robust. External influences such as the ambient temperature, vibrations, moisture and electromagnetic waves have no significant impact on the measuring result.