Jenway 3540 - Manual (Page 73)

conductivity reading should be between 180 and 220µS depending on the last
calibration or cell constant setting – if in doubt set the cell constant to 1.000 and re-
check. If this functions correctly then any problem is most likely to be associated with
the probe – if it fails to work correctly contact your local distributor or Jenway for
service advice.
8.70
Functional Check Temperature
Each channel has independent temperature measurement and display; conductivity
through the temperature sensor integrated in the probe and pH by its separate
temperature/ATC probe. If one of these is not connected or faulty the other will take
over for both channels. The temperature function of the conductivity channel can be
checked as described in section 8.60. To check the pH temperature/ATC function,
remove the probe from the mini-DIN connector on the rear panel and fit a 10K ohm
resistor between the pins indicated. The reading should be between 24 and 26
o
C
without the M symbol displayed, remove the resistor and ensure the reading returns
to the value entered for the manual temperature compensation and the M symbol is
displayed. If this functions correctly then any problem is most likely to be associated
with the probe – if it fails to work correctly contact your local distributor or Jenway for
service advice.
8.80 Functional Reset
Warning: Carrying out a reset will return all settings to their default values and
erase any stored data – ensure all setting information and valuable data is
recorded or backed up safely elsewhere before commencing this procedure.
Remove the power input jack plug from the rear panel connector.
Press and hold down the Enter [STO] key
While holding the key depressed reconnect the power input jack plug
The start up screen will be momentarily displayed and a stored reading will be
confirmed in an information box.
When the main measuring screen is displayed the reset will be complete.
If this does not resolve the problem please contact your local distributor or the
manufacturer for further advice.
10K ohm resistor
ATC Probe socket viewed from rear panel