Weidmuller introduces a flexible, compact trip amplifier for process signal levels

Citation

(1999), "Weidmuller introduces a flexible, compact trip amplifier for process signal levels", Sensor Review, Vol. 19 No. 2. https://doi.org/10.1108/sr.1999.08719bad.011

Weidmuller introduces a flexible, compact trip amplifier for process signal levels

Weidmuller introduces a flexible, compact trip amplifier for process signal levels

Keywords Signal processing

Weidmuller has introduced a compact EMC-compliant single-level trip amplifier for monitoring process signal levels. Offering four operating modes with adjustable set-points and dead-bands, it acts as a very flexible signal level detection device (see Plate 10).

Plate 10 Weidmuller introduces a flexible, compact trip amplifier for process signal levels

The Weidmuller MC8/TRIP Amplifier has a volt-free relay contact output, which detects when a process signal exceeds a pre-set threshold. Occupying just 10mm of DiN-rail width, it is available in two versions, both offering similar features and designed to operate within a temperature range of 0°C and +55°C. The MC8/TRIP/4..20/1C is used for monitoring 0mA to 20mA process signals, while the MC8/TRIP/0.. 10/1C is for 0V to 10V signals. The trip set-point for the relay can either be set by manual adjustment of an integral potentiometer, or this can be over-ridden by a separate mA input signal. The dead-band, the difference between the level at which the device trips, and then reverts to an un-tripped state, is also adjustable, avoiding multiple tripping due to noisy signals, or to enable the introduction of a time delay. The units feature in-built LEDs which indicate whether the unit is in the tripped or un-tripped state, and whether the set-point is being controlled remotely.

Four operating modes can be manually set by DIP switches on the side of the Trip Amplifier. These enable a permutation of tripping function and reaction to power failures. Tripping of the internal relay can be initiated by the process signal either exceeding, or falling below, a pre-set threshold. In the event of a failure in power to the unit when the relay is in the un-trip condition, the relay can either be energised, or de-energised. Internally, the functions are electrically isolated from each other up to 1kV.

For further information contact John Bauckham, Weidmuller Ltd, 1 Abbey Wood Road, Kings Hill, West Malling, Kent ME19 4YT. Tel: +44 (0)1732 877032; Fax: +44 (0)1732 874296.