S01.0.0X.6C-19
Installation and Operating Manual GEWAS 191 AN / N
page 5 of 6
8
What to do in case of alarm
The control device can only be switched off by disconnecting it.
Seek and eliminate error causes.
Possible error causes:
- A water film is located at the water sensor.
- The contacts of the water sensor are bypassed (e.g. via a metal surface)
- The water sensor has been disconnected or is defective.
Reconnect the control device.
9
Operating and maintenance advices
1
For reliable operation of the GEWAS the monitored liquid has to have a minimum conductivity of
at least 50 µS/cm. Liquids with lower conductivity (e.g. deionised/demineralised water) a reliable
detection is not possible.
2
The solenoid is servo-controlled; i.e. the pressure at the infeed side of the solenoid needs to ex-
ceed the outlet side pressure by at least 50 kPa (0.5 bar). This condition is fulfilled if the water
feed line is open and the water can flow freely at the solenoid outlet. Unless this condition has
been fulfilled the solenoid cannot open. In such a case remedy fault cause (e.g. activate water in-
feed of the device connected), disconnect control device and reconnect again.
3
When dead the solenoid will always be closed. In order to guarantee the required sealing proper-
ties, you have to make sure that there are no foreign objects (stones, sand etc.) in the solenoid
line. We, therefore, recommend to clean the sieve insert of the solenoid regularly.
4
In order to ensure long-time and trouble-free operation of the device, the functioning of the device
has to be checked at regular intervals (as is the case with any safety device). To do so produce an
alarm at least once a month by short-circuiting both water sensor contacts by means of a metal
object (e.g. spoon, knife, etc.). Disconnect device and reconnect the device.
The solenoid has to react with a clearly audible "clack" sound. This is to make sure that even if the
water is calcareous and even if it is not regularly operated the solenoid is fully operational regard-
less of the calcareous deposits.
5
The control device should not operate without solenoid connected!
If the function of the solenoid is not required the solenoid must still be connected to the control de-
vice. The connection of the solenoid to the water feed is not essential then.
6
The device has to be treated and handled carefully in accordance with the above specifications
(do not throw, bump against, etc.). Protect from soiling.
7
!!! Do NOT use the GEWAS in a humid environment !!!
10
Decommissioning, reshipment and disposal
10.1 Decommissioning
Always disconnect the device before from its supply before decommission (e.g. at fuse). Valid general safety re-
quirements shall be observed.
Please also make sure that connected Loads are disconnected also and are in a safe state.
10.2 Reshipment and disposal
All devices returned to the manufacturer have to be free of any residual of measuring media
and other hazardous substances.
Measuring residuals at housing or sensor may be a risk for persons or environment
Use an adequate transport package for reshipment, especially for fully functional devices.
Please make sure that the device is protected in the package by enough packing materials.
Add the completed reshipment form of the GHM website
http://www.ghm-messtechnik.de/downloads/ghm-formulare.html
The device must not be disposed in the unsorted municipal waste! Send the device directly to
us (sufficiently stamped), considering the above if it should be disposed.
We will dispose the device appropriate and environmentally sound.
