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. 31, the capacity transmitter is fitted with a single calibration button surroun-
ded by a green and red LED.
Calibration
push button
LED supply
LED digital
output
Plug connection
Out 4-20 mA
Supply +24V DC
Common
GND
Fig. 31: 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 indicat-
ing 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 calibra-
tion the signal is based on the default calibration values, so it will neither show 0% at mini-
mum capacity nor 100% at maximum capacity.
Calibration
244/319
Engineering manual - Unisab III 1.10
001930 en 2014.09
To Next Page
Loading...
Need help?
General
