AUX E&H Series Instrucciones de operaciones Pagina 37
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5.5.2 Check
The function group CHECK is only accessible for instruments equipped with the Plus packet.
Two different monitoring functions can be selected for the measurement in the function group
CHECK:
SCS electrode monitoring
The sensor check system monitors the pH and reference electrode for inaccurate measurement
and total failure.
The SCS detects:
– Breakage of electrode glass
– Fine short circuits in the pH measuring
circuit, e.g. moisture or dirtbridges in
clamping points
– Soiling or blocking of reference electrode
– Leakage current on IsFET sensor
Three methods are used:
– Monitoring of pH electrode for high
resistance (an alarm is signalled when the
impendance drops below a minimum value
of 500 kΩ). This function cannot be
selected when using an antimony or IsFET
electrode (A4).
– Monitoring of reference electrode
impedance (an alarm is signalled when the
defined threshold is exceeded). This
function can only be selected with a
symmetrical connection.
– Monitoring of leakage current with IsFET
sonsors (pre-alert E168 at I
Leak
>200 nA,
error E008 at I
Leak
>400 nA).
Caution:
• Do not remove the electrode from
the process without Hold. Since
the SCS is measured against
PMC, no contact between the
inner conductor and PMC would
trigger an alarm.
PCS alarm (Process Check System)
Function AC is used to examine the measuring signal for deviations. If the measuring signal is
constant for a specific period of time (several measured values), an alarm is issued. This type
of behaviour may be caused by soiling, blocking, etc.
Function CC monitors the relay activity. Due to freely selectable monitoring periods for the limit
functions, a relay failure will be recognised and an alarm will be triggered.
Note:
• Reference electrode monitoring is
only possible in conjunction with
the symmetrical connection (with
PMC).
• A current PCS alarm is auto-
matically deleted as soon as the
sensor signal changes.
• Due to its semiconductor
component, the IsFET sensor is
light-sensitive and reacts with
measured value fluctuations. For
this reason, avoid direct solar
radiation during calibration and
operation. Normal ambient light
does not affect the measurement.
22 mA
SCS.CDR
Fig. 5.8 SCS alarm
Constant measuring signal
= alarm is triggered
LIVE.CDR
t
Fig. 5.9 PCS alarm (live-check)
PM253E5A.CHP
Liquisys M CPM 223 / 253 Instrument configuration
Endress+Hauser 35
- 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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