Hach Sigma 950, Инструкция по эксплуатации инструмента

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67
Communications Setup
8.3.2 Analog Inputs
8.3.2.1 Analog Voltage Inputs
Note: Note: 4–20 mA inputs must be isolated. Maximum load per input is 200 ohms.
There are a total of seven analog input channels available on the 950 Flow Meter. These
inputs accept 0–20 mA dc or -4 to +4 V dc analog signals. They can be logged and
graphed in the same manner as the five dedicated channels (level, flow, rainfall, etc.) and
can also be used to trigger alarms, cause set point samples, and control 0–20 mA
outputs.
Cable Required
Analog Input Cable Assembly, 25 ft (7.6 m), 10-pin connector on one end, tinned wire
leads on the other end (P/N 2706).
8.3.2.2 Analog Voltage Inputs Programming
To map an external device to an analog input channel:
Select an analog input channel (1, 2, and 3 are current inputs and 4 through 7 are voltage
inputs).
1. Select
DATA LOG
from the Advanced Options menu.
2. Highlight
SELECT INPUTS
using the
UP
and
DOWN
keys. Press
SELECT
.
Note: A channel with logging enabled will have an arrow in front of it to signify that 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.
Table 26 Analog Input Pin Assignments
1
Pin Signal Description Description Wire Color
A 12 V dc
Provides a source of +12 V dc which may be
used to power external analog devices
white
B ground
Used in conjunction with any or all the input
signals on Pins C–J.
blue
C input 1 (0–20 mA dc)
0–20 mA dc inputs for Channels 1 through 3.
yellow
D input 2 (0–20 mA dc) black
E input 3 (0–20 mA dc) red
F input 4 (-4 to +4 V dc)
-4 to +4 V dc inputs for Channels 4-7
green
G input 5 (-4 to +4 V dc) gray
H input 6 (-4 to +4 V dc) brown
J input 7 (-4 to +4 V dc) purple
K not used N/A orange
1
If the DO/Conductivity options was purchased, only three additional inputs are available (Pins C, D, and E).