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MODEL 5081-T SECTION 11.0
MAINTENANCE
SECTION 11.0
MAINTENANCE
11.3 TRANSMITTER MAINTENANCE
Periodically clean the transmitter window with house-
hold ammonia or glass cleaner. The detector for the
infrared remote controller is located behind the win-
dow at the top of the transmitter face. The window in
front of the detector must be kept clean.
Most components of the transmitter are replaceable.
Refer to Figure 11-2 and Table 11-1 on the following
page for parts and part numbers.
11.1 OVERVIEW
Maintenance consists of "Preventative" and
"Corrective" measures.
11.2 PREVENTATIVE MAINTENANCE
11.2.1 Transmitter Maintenance. Transmitter mainte-
nance consists of periodic calibration. A monthly cali-
bration is a good starting maintenance schedule. This
schedule can then be fine tuned to the site process.
11.2.2 Sensor Maintenance. Sensor maintenance
consists of periodic cleaning of the electrode.
A weekly cleaning is a good starting maintenance
schedule. This schedule can then be fine tuned to the
site process.
11.2.3 Initiating HOLD Function For Maintenance.
To place the transmitter into the Hold operational
mode prior to servicing the sensor, press the HOLD
key on the IRC (infrared remote control). The mes-
sage field will respond with a message concerning the
present hold condition. Press the IRC editing key to
toggle to the On condition. Press ENTER to activate
HOLD output.
Hold Mode will maintain the operating current output
at the programmed value regardless of process
changes. Refer to Section 7.2.3, step 4, for instruc-
tions on how to set this value.
Temperature/Current output segments change to indi-
cate the current output level.
The section of the LCD reserved for hold annunciation
(Refer to Figure 11-1) will display HOLD when the
transmitter is in the Hold Mode.
To return transmitter to normal operation, press HOLD
on the IRC again to access the hold toggling function.
Always calibrate after cleaning or replacing the sen-
sor.
Press the IRC editing key to toggle to the OFF condi-
tion. Press ENTER to disengage the HOLD output
function.
'"""
µS/cm
F
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FIGURE 11-1. Hold Annunciation
Hold field Illuminated
Imposed Current Output
CALIBRATE PROGRAM DIAGNOSE
25
0
C 21.00
EXIT NEXT ENTER
mA
%