103
Communication setup
There are a total of three analog input channels available on the sampler. These inputs
accept 4–20 mA dc or –4.0 to +4.0 V dc analog signals. They can be logged and graphed
and can also be used to trigger alarms, cause setpoint samples, and control 4–20 mA
outputs.
8.5.2 Analog inputs programming
Analog input channels can accept a signal from an external device. This signal may
range from –4.0 V dc (min) to +4.0 V dc (max) or from 4 to 20 mA dc depending on the
input selected. In some cases, input signals from certain devices may also fall
somewhere within those ranges. For that reason, each analog input channel must be
mapped to the minimum and maximum signal limits of the external device.
To map an external device to an analog input channel:
1. From the Main Menu, select
OPTIONS, ADVANCED OPTIONS, DATALOG.
2. Highlight Select Inputs using the UP and DOWN keys and press SELECT.
Note: If logging is enabled on any channel, then that channel will have an arrow in front of the
channel name to signify the channel is logged.
3. Highlight the analog channel to log using the UP and DOWN keys, then press
SELECT.
4. Press
CHANGE CHOICE to cycle between Logged and Not Logged, then press
ACCEPT.
5. Enter a Logging Interval using the numeric keypad. Press
ACCEPT.
6. Select unit of measurement (ppm, ppb, afd, cfs, cfm, cfd, cms, cmm, cmh, cmd, gps,
gpm, gph, lps, lpm, lph, or mgd).
7. Enter Low Point.
8. Enter High Point.
9. Select another channel to configure, or press
RETURN to back up one step, or press
MAIN MENU to return to the Main Menu display.
Table 19Analog input pin assignments
Pin Signal Description Wire Color
A +12 V dc White
B Signal Ground Blue
C Voltage Input 1 (–4.0 V dc to +4.0 V dc) Yellow
D Current Input 1 (4–20 mA dc) Black
E Voltage Input 2 (–4.0 V dc to +4.0 V dc) Red
F Current Input 2 (4–20 mA dc) Green
G Voltage Input 3 (–4.0 V dc to +4.0 V dc) Gray
H Current Input 3 (4–20 mA dc) Brown
J not used Violet
K not use Orange
Note: There is no pin labeled “I”.
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
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