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2-wire transmitter
for pH Type 202701/10
for redox Type 202701/20 The 2-wire transmitter is intended for linking a pH or redox combination electrode with plug con-
nection to indicators/controllers with an active 4—20 mA input. On the output side the 2-wire
transmitters have a connection for supply and standard signal. Zero and slope of pH combina-
tion electrodes are adjusted at the indicator /controller. No calibration is required for redox elec-
trodes.
The 2-wire transmitter is screwed directly on to the electrode head of the combination elec-
trodes.
This circuit arrangement largely prevents interference from dirt, humidity, or electrical fields from
live conductors. A conventional coaxial cable or a 2 wire cable with screen is sufficient as con-
nection between the transmitter and the indicator. This permits trouble-free transmission over
larger distances between the transmitter and the indicator.
An isolated supply is recommended when operating the transmitters with a PLC.
Type 202701 for pH
The 2-wire transmitter converts the high-impedance signal of the pH electrode
(up to 1000MOhm) into a standard 4—20 mA signal.
Type 202702 for redox
The 2-wire transmitter converts the signal of the redox electrode into a standard 4—20 mA
signal.
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