Rockwell Automation 1734sc-IE4CH E+H Instruments via HART to PlantPAx User Manual - Manual (Page 149)

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)
• Temperature
Conductivity (analog sensors)
• Conductivity
• Resistivity (conductive measurement only)
• Concentration
pH / ORP (digital sensors)
Oxygen (digital sensors)
• pH value
• Oxidation-reduction potential
• Oxygen
• Temperature
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
μ
H (output 1)
24
μ
H (output 2)
1.2 nF (output 1)
negligible (output 2)