Calog Instruments’ locally designed and manufactured CALOG 9000 – a miniature DIN-rail mount programmable isolated transmitter – has being selling consistently well into the industrial market, due partly to its reliability and partly to the versatile range of programmable inputs that SmartView software allows.
With dimensions of only 92 x 92 x 26 mm, the device offers complete three-way isolation between power supply, input and output. The inputs are programmable to accept thermo-couples of type J, K, N, R, S, T and W5; RTDs of type Pt100 or Ni100; mV inputs up to 52 mV; 0–20 mA /4–20 mA inputs; voltage inputs up to 10 V; potentiometer inputs; and frequency inputs from NPN/PNP proximity switches.
Integral two-wire transmitter power is supplied as standard with the unit, as well as a precision reference for potentiometer inputs. The analog output is programmable for 0–20 mA/4–20 mA or 0–10 V. The power supply is 95–265 V a.c./d.c. as standard, while the 9240 model offers a 24 V d.c. isolated power supply instead. Both units meet European EMC directive 89/336/EEC and Low Voltage directive 73/23/EEC.
An RS-232 serial interface is standard, while an RS-485 option allows up to 99 transmitters to be linked on the same bus. The unit can also accept an ASCII based serial input signal for conversion to an analog output signal. A lineariser feature is included and the user can select s-curve, sphere, square-root extraction or off (no linearisation).
Configuration and field calibration is done via notebook computer or desktop PC, with user-friendly software downloaded from the Calog website. The serial interface allows connections to remote computers and scada systems using DPM’s DIGIbus protocol.
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