Service manual

MDS E-SCAN SERVICE
64
8.5 Maintenance
MDS E-Scan Monitor Divert System Periodic Inspection Checklist
We recommend the following checks be performed at least on a monthly basis under normal
operation.
§ Desiccant condition: The desiccant seen through the view plug on the sensing head should
be light orange when effective and clear when no longer effective. The desiccant can be
renewed by heating to approximately 250°F (121°C) until it recovers its original color.
§ Isolation valve position: Verify (if equipped) it is turned fully counter-clockwise
(completely open)
§ Check printer for error/warning logs: Refer to chapter 5 in the manual for explanations.
Keep a copy of printouts for EMC service personnel.
The following checks are made from the Monitor panel of the system by pressing MENU,
selecting DIAG and then VOLTAGES.
§ U1 Meas / U2 Meas: between 2.00 to 8.00 (depends on calibration and current product
strength)
§ U1 Temp / U2 Temp: Compare temp. on solids meter to the voltage using (Voltage -
0.5V)x50=°C
§ U1 Lamp / U2 Lamp: Less than 3.80 (If not adjust R20 on Analog Board in sensing head
for approx. 3.50. Measure lamp voltage in the sensing head across TB1-3 and TB1-9.)
§ U1 0–10 / U2 0–10: Depends on range of unit and current product strength (Ex: If 50-80%
is the range, 50%=0 and 80%=10)
§ U1 +5 / U2 +5: Between 4.75 and 5.25
§ U1 +15 / U2 +15: Between 13.50 and 16.50
§ U1 –15 / U2 –15: Between –16.50 and –13.50
§ MDS +15: Between 13.50 and 16.50
§ MDS –15: Between –16.50 and –13.50