TPS miniCHEM-pH, Handbook, Page: 18 / 28

Page 18
5. Process Monitoring
Once the mini CHEM -pH has been installed, connected and calibrated, it can be
used for continuous monitoring. To monitor the process, WITHOUT any control or
alarm functions switch the function switch to
STANDBY .
6. Automatic Dosing
For Automatic Alarming or Control, switch the function switch to AUTO to enable
the Alarm LED and the (optional) relay output. These will be switched ON while
the pH exceeds the limit value, and will switch OFF once the pH is back within the
limit.
7. Manual Dosing
From time to time, a dose of chemical may be required even when the pH is within
the limit value. To do this, simply switch the function switch to
MANUAL,
if the
(optional) relay output is fitted.
NOTE: The output will be ON continuously while the function switch is set to
MANUAL
. It will not be switched OFF again until the switch is set back
to one of the other modes.
8. Fuse Replacement
If the current drain from any device connected to the output relay exceeds 1Amp,
the output protection fuse will blow.
To replace the fuse…
1. SWITCH THE
mini CHEM -pH OFF.
2. Pull out the black fuse carrier.
3. Replace the blown fuse
4. Push the fuse carrier with the new fuse back into place.
ALWAYS REPLACE THE FUSE WITH A 1 AMP, 240V
FUSE. USING A FUSE WITH HIGHER CURRENT RATING
MAY DAMAGE YOUR CONTROLLER, VOIDING THE
WARRANTY.
Before switching the mini CHEM -pH back to
AUTO
mode, ensure that the cause
of the blown fuse has been eliminated.
If the current drain of the device connected to the relay output is greater than 1
Amp, an external contactor should be used. Please consult an electrical contractor
or TPS for details.