Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
265/346
Calibration
7.5.7 Adjusting long-stroke capacity rod
SAB 110-128-163-202, SAB 81-89 and SAB 330 (capacity and Vi)
As shown in Fig. 35, the capacity transmitter is fitted with a single calibration button surrounded by a
green and red LED.
Fig. 35: Long-stroke capacity rod for SAB 110-128-163-202, SAB 81-89 and SAB 330 (capacity and Vi)
During normal operation the red LED is flashing rather slowly. The green LED is switched on constantly
when the transmitter is in 100% position whereas it flashes quickly when the transmitter is in 0%
position.
Calibration is carried out as follows:
1. Apply supply voltage minimum five minutes before calibration.
2. Press the calibration button for approximately five seconds to get the transmitter in calibration
mode. The red LED will change from normal flash to OFF.
3. Move the slide to minimum position and press the calibration button once. The red LED will
switch ON immediately. After a while, the red LED will turn OFF again indicating that it is ready
for 100% calibration.
4. Move the slide to its maximum position and press the calibration button twice. The red LED will
start flashing quickly. After a while, the red LED will change to a normal flash rate indicating that
calibration is completed.
5. Calibration will be remembered even in case of a power failure. However, if power supply is
turned off during the calibration process the transmitter will return to the last saved values and it
is necessary to recalibrate.
6. It is possible to reset the transmitter to Factory values. Press the calibration button for minimum
20-30 seconds. The green and red LED will flash shortly (one after the other) when the factory
reset is complete.
The 4-20 mA signal from the transmitter is permanently available. However, during calibration the signal
is based on the default calibration values, so it will neither show 0% at minimum capacity nor 100% at
maximum capacity.
Calibration
push button
LED supply
LED digital
output
Plug connection
Out 4-20 mA
Supply +24V DC
Common
GND
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