
Accuracy pH measurement
Reference temperature +25 °C
Measured value resolution 0.01 pH
Display deviation
1
max. 0.5 % of measuring range
Repeatability
1
max. 0.2 % of measuring range
Measurement deviation
1
pH signal output max. 0.75 % of measuring range
Redox measurement
Measured value resolution 1 mV / 0.1 %
Display deviation
1
max. 0.5 % of measuring range
Repeatability
1
max. 0.2 % of measuring range
Measurement deviation
1
redox signal output max. 0.75 % of measuring range
Temperature measurement
Measured value resolution. 01 °C
Display deviation
1
max. 1.0 % of measuring range
Measurement deviation
1
temperature signal output max. 1.25 % of current output range
Ambient conditions
Ambient temperature (nominal operating conditions) –10 ... +55 °C
Ambient temperature (limit operating conditions) –20 ... +60 °C
Storage and transportation temperature –25 ... +65 °C
Relative humidity (nominal operating conditions) 10 ... 95 %, non-condensing
Ingress protection of panel-mounted instrument IP 54 (front panel), IP 30 (enclosure)
Ingress protection of field instrument IP 65
Pollution degree 2 acc. to IEC 61010-1
Installation category II
Maximum altitude 2000 m above sea level
Electromagnetic compatibility Interference emission and interference immunity acc. to
EN 613261:1998 / A1:1998
Mechanical construction
Dimensions of panel-mounted unit (H × W × D) 96 × 96 × 145 mm
Installation depth approx. 165 mm
Dimensions of field instrument (H × W × D) 247 × 170 × 115 mm
Weight of panel-mounted unit max. 0.7 kg
Weight of field instrument max. 2.3 kg
Measured value display LC display, two lines, five and nine digits, with status indicators
Materials
Housing of panel-mounted unit Polycarbonate
Front membrane Polyester, UV-resistant
Field instrument standard versions / CSA GP version ABS PC Fr / Polycarbonate
Power supply
Supply voltage 100 / 115 / 230 V AC +10 / –15 %, 48 ... 62 Hz
24 V AC/DC +20 / –15 %
Power consumption max. 7.5 VA
Mains protection microfuse, medium slow 250 V / 3.15 A
1
According to IEC 746-1, for nominal operating conditions
Subject to modification.
%
Ω
°C
PM253E10.CHP
Liquisys M CPM 223 / 253 Technical data
Endress+Hauser 81
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