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10 pH indicator
10.1 pH measurement circuit
The JUMO dTRANS Az 01 indicator/controller (1) requires a standard input
signal (0(4) — 20 mA) that is proportional to the pH.
The 2-wire pH transmitter (2) provides this standard signal.
The pH combination electrode (3) is connected to the 2-wire pH transmitter (2),
which in its turn is connected to the JUMO dTRANS Az 01 (1). A temperature
probe (4) can be connected to the indicator/controller as an option. This
temperature probe can be used to measure the temperature of the liquid. The
dTRANS Az 01 can indicate this temperature, control it, and/or use it for
temperature compensation of the pH value.
As a further option, the JUMO dTRANS Az can supply the voltage for the 2-
wire transmitter.
Example
A combination of:
- (1) JUMO dTRANS Az 01, (configured as a pH indicator,
rAnG 21
)
- (2) JUMO 202701 (2-wire transmitter for pH)
- (3) pH combination electrode
- (4) optional temperature probe (Pt100 or Pt1000)
10.2 Calibration
Calibration
options
The electrode parameters of a pH combination electrode are subject to
manufacturing tolerances and variations depending on usage. To compensate
for these changing electrode parameters, the indicator/controller offers two
calibration procedures:
PGM
EXIT
K1
K2
K3
K4
C
(1)
(2)
(3)
(4)
