About AS4 4-20mA Input and Repeater with Display and Alarms

THE INSTRUMENT

Often it is more cost effective to replace a sensing head with one which is pre-calibrated at a testing station, thus reducing disruption of the measuring system. Technovation offers such an industry standard 4-20mA transmitter consisting of an electrochemical sensor, its associated circuitry and in a Ex-Proof  housing and Ex-proof Sensor head.

FEATURES

The two-wire transmitter with a local display for measured parameter value allows the signal and power to be supplied on a single wire-pair by modulating the power supply current with the input signal source. The transmitter is immune to voltage drops from long runs and noise from motors, relays, actuators, switches, transformers and industrial equipment.

APPLICATIONS

Every transmitter is supplied pre-calibrated for a customer specific range. The table below gives an indication of the gases/ranges offered. These transmitters can be connected to a DC system which supplies the DC Power for the loop. They could also be connected to stand alone controllers and PLCs and other data acquisition systems

STANDARD SPECIFICATIONS

Power Supply                : 12 to 24 VDC

Sensor Expected life     : 2 years in air

Sensor type                     : Electrochemical

Duty                               : Continuous

Operating temp             : 5 oC to 45 oC

Operating Humidity       : 10 - 90 % RH

Operating Pressure       : Ambient

Output impedance         : 2 M Ohms

Calibration                     : Via built in Span and Zero potentiometers.

Housing                         : Cast Aluminum Ex-proof housing

Sampling                       : Diffusion mode OR in flow through mode.

Display                           : LCD Display.

Size and weight            : 120x120x90 mm. 1kg

Connection size            : M20 threaded cable entries for cable gland and for sensor head.