Hach-Lange SI794 P User Manual - Manual (Page 97)

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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