User Manual Owner's manual

Rockwell Automation Publication PROCES-UM002A-EN-P - July 2014 149
Liquiline M CM42 Transmitter Appendix M
Measured Variables
pH / ORP (analog sensors)
• pH value
• Oxidation-reduction potential (ORP)
• Tem p e r a t ure
Conductivity (analog sensors)
• Conductivity
• Resistivity (conductive measurement only)
• Concentration
pH / ORP (digital sensors)
Oxygen (digital sensors)
• pH value
• Oxidation-reduction potential
• Oxygen
• Tem p e r a t ure
Signals from Instrument to Control System
Signal Details
Output signal Max. load with a supply voltage of 24 V: 500 Ω
Max. load with a supply voltage of 30 V: 750 Ω
• Current output 1:
1x 4...20 mA, potentially isolated against sensor circuit
• Current output 1 and current output 2 (optional):
2x 4...20 mA, potentially isolated against sensor circuit
• Only for HART communication:
0.8...1.2 mA peak to peak
Ex specification current output 4/20 mA Intrinsically safe supply and signal circuit with type of protection: EEx ia IIC T6 passive
Max. input voltage Ui
Max. input current Ii
Max. input Pi
Max. internal inductivity Li
Max. internal capacity Ci
30 V
100 mA
750 mW
221
μH (output 1)
24
μH (output 2)
1.2 nF (output 1)
negligible (output 2)