S+S Regeltechnik PREMASGARD 1211-M Notice D'instructions page 11

G
®
PREMASGARD
Offset adjustment is done at a potentiometer on the circuit board within
an adjustment range of ± 10 % of the device's pressure range.
Ex-factory this potentiometer is in center position and is lacquer sealed.
All settings and adjustments that are made before must be done in this
configuration.
Offset adjustment is carried out using a tool called "screwdriver 2.5"
(blade with in mm).
Automatic offset setting
1. Before setting the zero point, the device must be in operation
for at least 60 minutes.
2. Connect pressure inputs P (+) and P (–) by means of a hose
(pressure difference between both inputs = 0 Pa).
3. For zero point setting press button uninterruptedly for 5 seconds.
A LED signalises prompting the calibration by short flashing,
and after a short countdown the measured (current) offset value
is added to the measurand and zero voltage safe stored.
Correct calibration is confirmed by steady light of the LED
for 3 seconds respectively indicated in the display (optional)
by switching from "AUTO 0" to "PROG 0".
Note: By releasing the button during the countdown (counter > 0),
zero point setting is immediately terminated!
Manual offset adjustment
At the potentiometer OFFSET ∆P can be balanced.
The adjustment range is ca. ± 10 % of the pressure range.
Here another reference point different from zero point can be used.
Display - individually
programmable
the output voltage is 5 V at 0 Pa pressure difference
121x - Modbus | Zero point calibration and configuration
Plug for
display
After successful zero point calibration,
(with the offset knob in central position)!
Output voltage 0 ...10 V
for pressure difference - ∆P ... +∆P
Schematic diagram
ON DIP A
min. max.
1 2 3 4 5 6 7 8
offset ON DIP B
auto
zero
1 2 3 4 5 6
1 2 3 4 5
11
PREMASGARD
ON
min. max.
1 2 3 4 5 6 7 8
offset ON DIP B
auto
zero
1 2 3 4 5 6
Plug for
display
1 2 3 4 5
DIP A: Bus address
DIP B: Bus parameters
(Baud rate, parity ...)
Telegram indicator
Reception (LED green)
Error (LED red)
LED and
pushbutton
zero point setting
(auto zero)
Offset correction
pressure
ca. ±10% of final value
Plug for display
contact is
on the right side
® 121x - Modbus
DIP
DIP A
DIP
(Ba
Tel
Rec
Err
LED
pus
zer
(au
Offs
pre
ca.
Plu
con
on