Acromag Model ST133 temperature transmitter

Acromag’s Model ST133 temperature transmitter is an isolated thermocouple/millivolt signal conditioner. This high-performance version of the economy-level ST132 also converts sensor input signals from eight thermocouple types or a ±100 mV range and outputs a proportional 4-20 mA process control signal, but with the addition of 1500 V isolation between the input and output circuits to shield equipment from high-voltage surges and transient signals.

Units support mounting in DIN Form B sensor heads or on a DIN rail. They are CE compliant with pending UL/cUL Class 1 Div 2 Zone 2 approvals and operate reliably over a -40 to 80°C operating range.

Many applications require high isolation to combat and reject the effects of large common-mode voltages, electrical noise, surges and system ground loops. The ST133 bridges the gap between economy units and more expensive high-performance isolated transmitters.

Other features include signal linearisation and cold-junction compensation functions, with response times as low as 30 ms. Windows software helps quickly configure the transmitter using a USB cable connection.

A rugged design helps these transmitters operate reliably in harsh industrial environments. Ambient temperature drift is less than 75 ppm/°C for long-term stability. The ST133 is shock (50g) and vibration (5g) resistant and includes high-level electrical noise immunity (RFI, EMI, ESD, EFT and surge protection).