Hach-Lange SI794 D tr User Manual - Manual (Page 91)

Temperature input NTC 22 kohms / NTC 30 kohms*
2-wire connection, adjustable
Measuring range -20.0 ... +150.0 °C / -4 ... +302 °F
Adjustment range 10 K
Resolution 0.1 °C / 1 °F
Measurement error 1,2,3 < 0.5 K (<1 K at > 100°C)
HOLD input Galvanically separated (OPTO coupler)
Function Switches transmitter to Hold mode
Switching voltage Inactive 0 ... 2 V (AC/DC)
Active 10 ... 30 V (AC/DC)
CONTROL input Galvanically separated (OPTO coupler)
Function Control input for automatic cleaning system
Switching voltage Inactive 0 ... 2 V (AC/DC)
Active 10 ... 30 V (AC/DC)
Output 1 0/4 to 20 mA, max. 10 V, floating
(galv. connected to output 2)
Process variable * O
2
saturation/O
2
concentration
Overrange * 22 mA in the case of error messages
Output filter * Low-pass, filter time interval 0 ... 120 s
Meas. error 1 < 0.3 % current value + 0.05 mA
Start/end of scale Configurable within selected range
Span allowed 5 ... 500 % / 0.5 ... 50 mg/L (ppm)
Output 2 0/4 to 20 mA, max. 10 V, floating
(galv. connected to output 1)
Measured variable Temperature
Overrange * 22 mA in case of temp error messages
Output filter * Low-pass, filter time interval 0 ... 120 s
Measurement error 1 < 0.3 % current value + 0.05 mA
Start/end of scale * -20 ... +150 °C / -4 ... +302 °F
Span allowed 20 ... 170 K (68 ... 338 °F)
91