PART FOUR - SERVICE AND MAINTENANCE
SECTION 1 - GENERAL INFORMATION
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
90
P A R T F O U R - S E R V I C E A N D M A I N T E N A N C E
S
ECTION
1
1.1 Inspecting Sensor
Cable
1.2 Replacing Fuse(s)
1.3 Replacing Relays
If a measurement problem exists and you suspect the sen-
sor cable, inspect it for physical damage. If an interconnect
cable is used, disconnect the cable at both ends (sensor
and analyzer) and, using an ohmmeter, check its wires for
continuity and internal shorts.
The analyzer is equipped with two board-mounted fuses
(type T slow-blow; 5 mm x 20 mm size). Fuse values are
shown next to each fuse (Figure 2-3 or 2-4). The fuses
protect the 115 and 230 volt line power circuits.
WARNING:
DISCONNECT LINE POWER TO AVOID THE
POSSIBILITY OF ELECTRICAL SHOCK.
1.
After disconnecting line power, open the analyzer door
and locate the fuses (shown in Figure 2-3 or 2-4).
2.
Remove the blown fuse and replace it with a GLI fuse
or an equivalent. Refer to PART FIVE -- Spare Parts --
for GLI fuse kit part number.
3.
Reconnect line power and close the analyzer door.
The analyzer relays are soldered into a complex, multi-
layered circuit board. To avoid the possibility of damaging
this board while attempting to replace a relay:
•
Simply return the complete analyzer to the GLI Cus-
tomer Service Dept. or your local factory-authorized
service organization for relay replacement.
-- or --
•
Replace the complete scaling board assembly contain-
ing the relays. Refer to PART FIVE -- Spare Parts -- for
the GLI scaling board assembly part number.
GENERAL INFORMATION
