Instruction Manual REG 21
6
2
Instrument description
The REG 21 pressure regulator measures differential pressures between its two
pressure ports, which lead to two chambers of a pressure measurement capsule.
Pressure is measured via a beryllium bronze membrane spring, which is displaced by
the pressure difference between the two chambers. Inductive displacement
transducers measure membrane deflection without contacting the membrane. The
instrument has no frictional parts or parts subject to mechanical wear, and performs
the following tasks:
Displays the measured value
Provides the voltage (current is also an option) proportional to the measured value.
Its two switching outputs make it suitable for use as either a two-point or a three-point
controller
The following are some additional features worth highlighting:
Overload protection
Adjustable switching hysteresis
High level of sensitivity
High level of accuracy and long-term stability
Automatic zero-point correction
Low temperature dependence
3
Start-up
3.1
Features
3.1.1 Inputs and outputs
Fig. 1: basic circuit diagram
Power supply:
Depending on the model, the power is supplied as either 230 V-AC,
115 V-AC, 24 V-AC or 24 V-DC. The details of the supply voltage are given on the
rating plate.
Pressure ports:
(-) port: reference pressure; (+) port: pressure to be measured.
The measurement range is given on the rating plate.
Analogue output:
The instrument produces a voltage output proportional to the
measured pressure. Output is in the range of 0...10 V (ranges of -
5…+5 V, 4...20
mA or 0...20 mA are optional). The spread of the analogue output values is
proportional to the measurement range. The type of analogue output is indicated on
the rating plate.
power supply
pressure
ports
analog output
switching output 1
switching output 2
