3
5.1.
Pressure Connections
The instruments pressure ports are marked by
+
and
−
symbols. The pressure applications need to be installed
according to the label.
• Differential pressure
+
= higher pressure
measurement:
−
= lower pressure.
• Pressure measurement
+
= pressure port
• Gauge measurement
−
= negative pressure port
5.2.
Shock Pressure Moderation
During pulsating pressure on the plant mechanical wear
and disturbances in functional capability may occur. To
avoid this we recommend installing absorbers into the
pressure lines.
5.3.
Zero Point Adjustment
Usually adjustment of the instrument is not necessary for
it is factory calibrated. The output signal can be adjusted
with inbuilt zero point potentiometer.
Location of zero point potentiometer
Adjustment sequence
• Open housing cover.
• Connect current indicator (0-20 mA) to output signal
between terminals 11 and 12.
• Connect and switch on power supply.
• Measuring system depressurized: Output signal = 0
resp. (4) mA. Correct offset using zero point potentio-
meter N.
• Mount housing cover.
5.4.
Switching Point Adjustment
The instrument’s main board has two calibration poten-
tiometers and a coding switch to set switching points. Af-
ter removing housing cover they are freely acessible.
Adjustment sequence
• Switch on supply voltage.
• Open housing cover.
• Selector setting 1: Display indicates actual value.
• Selector setting 2: Display indicates switching point I.
• Selector setting 3: Display indicates switching point II.
• The respective setpoint values for contact 1 and con-
tact 2 can be set in display using potentiometers K1
and K2.
• After adjustment is done turn selector to setting 1: ac-
tual value.
• Setpoint values can be displayed any time by turning
selector to position 2 or 3.
Selector and Set-up Potentiometer
5.5.
Electrical Connection
3-wire connection 24 V DC
2-wire connection 24 V DC
For Gaseous Media
Adjustable attenuator
valve
MZ41
During operating condition ad-
just needle valve that way,
that the indicator follows chan-
gements of pressure delayed.
MZ41
Mounting holes
Range adjustment: N = Zero point
Switching point
potentiometer
Selector
Selector
