Hach-Lange SI794 P User Manual User Manual
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Temperature input *
Pt100/Pt1000/NTC 30 kΩ/NTC 8.55 kΩ/Balco 3kΩ
2-wire connection, adjustable
Measuring range
Pt 100/Pt 1000
-20.0 ... +200.0 °C
(-4 ... +392 °F)
NTC 30 kohms
-20.0 ... +150.0 °C
(-4 ... +302 °F)
NTC 8.55 kohms
-10.0 ... +130.0 °C
(-4 ... +266 °F)
Balco 3 kohms
0.0 ... +100.0 °C
(+32 ...+212 °F)
Adjustment range
10 K
Resolution
0.1 °C / 1 °F
Measurement error
1,2,3
<0.5 K (<1 K for Pt100; <1 K for NTC >100°C)
Temp compensation
Linear –19.99 ... +19.99 %/K
of process medium
(reference temp 25 °C)
HOLD input
Galvanically separated (OPTO coupler)
Function
Switches transmitter to HOLD mode
Switching voltage
0 ... 2 V (AC/DC)
Inactive
10 ... 30 V (AC/DC) Active
CONTROL input
Galvanically separated (OPTO coupler)
Function
Control input for automatic cleaning/calibration
system
Switching voltage
0 ... 2 V (AC/DC)
Inactive
10 ... 30 V (AC/DC) Active
Output 1
0/4 to 20 mA, max. 10 V, floating
(galvanically connected to output 2)
Measured variable *
pH or mV value
Overrange*
22 mA in the case of error messages
Output averaging filter *
Low-pass, filter time interval 0 ... 120 s
Measurement error
1
< 0.3% current value + 0.05 mA
Start/end of scale
Configurable within the measuring range for
pH or mV
Span allowed
pH 2.00 ... 18.00 / 200 ... 3000 mV