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7 Maintenance and troubleshooting
Maintenance:
• Maintenance means that all measures which will guarantee the safety of operation and
reliability of the entire measuring system are taken in due time.
Maintenance of CPM 223 / 253 includes:
• Calibration (see chapter 5.9)
• Cleaning of assembly and sensor
• Checking of cables and connections
Troubleshooting:
Determination and elimination of the cause of the problem in the case of an operating fault.
Troubleshooting refers to measures that can be performed without intervention in the instrument
(for instrument defects, see chapter 8, Corrective maintenance).
Troubleshooting of the CPM 223/253 and the measuring system is performed with the aid of the
troubleshooting table in chapter 7.1.
Warning:
• Please be aware of effects work
performed on the instrument might
have on the process control
system or the process itself.
• When removing the sensor during
maintenance or calibration, please
consider potential hazards due to
pressure, high temperatures and
contamination.
Note:
• Please contact your E+H support
office if you have any queries. You
can also send your queries to the
E+H Service Organisation via the
Internet.
www.endress.com
7.1 Troubleshooting common problems
Error
Possible cause Remedy Equipment need, spare parts
Device cannot be
operated, value 9999
– Operation locked Press simultaneously the CAL and
MINUS keys
See chap. 4.3
Measuring chain not
adjustable
– Reference system poisened Test with new Sensor pH/mV sensor
– Diaphragma clogged Clean or grind down diaphragma HCl 3 %, use file (only file in one
direction)
– Measuring line open Short-circuit pH input on
instrument ⇒ display pH 7
– Sensor asymmetry voltage too
high
Clean diaphragma test with other
sensor
HCl 3 %, use file (only file in one
direction)
– Potential matching (PA/PM)
Liquisys ⇔ wrong medium
asymm.: no PA or PA conn. to PE
symm.: PA connection mandatory
See chap. 3.5
No or creeping change
of display
– Sensor soiled Clean sensor See chap. 8.6.2
– Sensor ageing Replace sensor new sensor
– Sensor defective (ref. electrode) Replace sensor new Sensor
– No internal buffer Check KCl supply
(0.8 bar above medium pressure!)
KCl (CPY 4-x)
Measuring chain slope /
slope too low
– No high-resistance connection
(moisture, dirt)
Check cables, connectors and
junction boxes
pH simulator,
Insulation see chap. 8.6.5
– Instrument input defective Check instrument directly pH simulator
– Sensor ageing Replace sensor pH sensor
Measuring chain slope
not adjustable / no slope
– Hair crack in glass membrane Replace sensor pH sensor
– No high-resistance connection
(moisture, dirt)
Check cables, connectors and
junction boxes
pH simulator,
insulation see chap. 8.6.5
Maintenance and troubleshooting Liquisys M CPM 223 / 253
60 Endress+Hauser
- Endress Hauser 1
- Table of contents 3
- 1 General information 4
- 1.5 Product structure 5
- 2 Safety 6
- 2.5 Immunity to interference 7
- 2.6 Declaration of conformity 7
- 3 Installation 8
- 3.2 Dimensions 9
- 3.3 Mounting 10
- PM253E03.CHP 11
- 3.3.2 Mounting examples 12
- Endress+Hauser 11 13
- 3.4 Electrical connection 14
- 131094-4G 15
- Construction of special 16
- CPK1_12e.EPS 16
- Fig. 3.13 16
- • If the software setting 18
- Setpoint 19
- 4.3 Keys 20
- PM253ED4.CHP 21
- 4.5 Operating concept 22
- 4.5.2 Access codes 23
- 4.5.3 Menu structure 23
- • If a change is made but not 23
- • See the appendix of these 23
- 5 Instrument configuration 25
- RELAY2.CDR 26
- Oper.Mode 27
- Glass A5 28
- Fig. 5.4 29
- Alarm signalling and 29
- 28 Endress+Hauser 30
- PM253E5A.CHP 31
- Fig. 5.7 32
- User-defined current output 32
- Sel. Out2 33
- Tabelle (3) 34
- Table (3) 34
- 5.5 Monitoring functions 35
- Rel.Assg 36
- Curr.Assg 36
- CleanTrig 36
- 5.5.2 Check 37
- • Due to its semiconductor 37
- A.Thresh 38
- Err.Delay 38
- LowAlarm 38
- HighAlarm 39
- ProcMonit 39
- Tmax Low 39
- Tmax High 39
- GRENZ-E.CDR 40
- not allowed 41
- Pulse length modulation 42
- Pulse frequency modulation 42
- PM253E5B.CHP 43
- 5.6.4 ChemoClean function 44
- • Use relays 3 (water) and 44
- • When “Economy” is selected 44
- LC PV R2 45
- LC State 46
- 120 R239 48
- 0.3 R2310 48
- Clean = ChemoClean (5) 49
- Neutra controller (6) 49
- ChemoClean (5) 49
- Proc.Type 51
- 5.7 Service 52
- S.Default 53
- Contr E1 54
- SerNo E113 54
- LSG E114 54
- 5.10 Calibration 55
- the user is 55
- ≤ 0.05 and value 56
- 59.18 N2 59
- PV Offset 60
- 6 Interfaces 61
- Endress+Hauser 61 63
- 62 Endress+Hauser 64
- Endress+Hauser 63 65
- 64 Endress+Hauser 66
- Endress+Hauser 65 67
- 8.1 Diagnosis 68
- Endress+Hauser 67 69
- 223EXPHE.CDR 70
- 8.2.2 Disassembly of CPM 223 71
- 8.2.3 Assembly of CPM 223 71
- 8.2.4 Spare parts for CPM 223 72
- 253EXPHE.CDR 73
- 8.3.2 Disassembly of CPM 253 74
- 8.3.3 Assembly of CPM 253 74
- 8.3.4 Spare parts for CPM 253 75
- 8.4 Spare parts orders 76
- 8.6.1 pH/redox transmitter 77
- 8.6.2 pH/mV electrodes 77
- 8.6.3 Assembly 77
- 8.6.4 Liquid KCl supply 77
- 9 Accessories 79
- 10 Technical data 81
- 80 Endress+Hauser 82
- Endress+Hauser 81 83
- 11 Appendix 84
- Endress+Hauser 83 85
- 84 Endress+Hauser 86
- Endress+Hauser 85 87
- 12 Index 88
- PM253E12.CHP 89
- Declaration of contamination 91
- BA 194C/07/en/07.02 92
- Printed in Germany / CV5 / DT 92
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