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Auto-Sample
If a data logger is connected and operating in the manual sampling mode or a data logger is not
connected the following automatic sampling rates may be selected with SW100 dip switch
settings:
Dip switch settings
3 4 5
Sampling frequency
ON ON ON No automatic sampling
OFF ON ON 5 minutes
OFF OFF ON 15 minutes
OFF ON OFF 30 minutes
OFF OFF OFF 1 hour
This auto-sample function will not function if a data logger is connected and operating in
automatic sampler mode programmed through the JCS.
4-20 MA Analog Output
The analog output signal at pin 18 of the 25 pin connector can be configured to provide the
instrument's native mode 0-2 Volt output or the optional 4-20 mA output by setting the option
board jumper (SW101) to the "V" position for voltage, or the "I" position for current. (Pin 23 is
the ground pin for the analog output function. Pin 18 is positive with respect to the ground pin).
• The 0-2 Volt output circuit can drive loads of 10 k ohms or higher.
• The 4-20 mA output is a passive transmitter and requires the connected receiver to supply
between 10 and 28 volts of excitation potential.
The 631-X must have the auto ranging feature disabled in order to get accurate analog output
readings. The approximate range of the H
2
S concentration must be known before the instrument
can be set into that specific range (0,1, 2 or 3). The analog output signal is based on each
individual range and not the entire range (0-50 ppm).
Note that neither analog output circuit is floating. The negative terminals of both circuits are
connected to the instrument's common ground buss.
SW101 Functions:
V = 0-2V analog output
I = 4-20 ma analog output
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