Instruction manual

79
MODEL 5081-C SECTION 11.0
MAINTENANCE
SECTION 11.0
MAINTENANCE
11.3 CORRECTIvE MAINTENANCE
Refer to Figure 11-2 and Figure 11-3 for an exploded
view of the 5081-C Transmitters.
Tables 11-1 and 11-2 list suggested spare parts along
with part numbers. Sales and service locations are
located on the back pages of this manual.
11.1 OvERv IEw
Maintenance consists of "Preventative" and
"Corrective" measures.
11.2 PREvENTATIv E 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 4.2, step 4, for instructions
on how to set this value.
Temperature/Current output segments change to indi-
cate the current output level. See Figure 10-1.
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.
5000
µS/cm
F
A
u
L
T
H
O
L
D
©
FIGURE 11-1. Hold Annunciation
Hold field illuminated
imposed Current o utput
CALiBRATE PRo GRAM d iAGNo SE
2 5
0
C 2 1 . 0 0
E x I T N E x T E N T E R
mA
%