Hach 900 MAX ユーザーズマニュアル
Section 6
Page 93
8990cm.fm
Analog Inputs
Figure 28
Deadband Concept
6.5 Analog Inputs
6.5.1 Analog Inputs Connection
Note: 4–20 mA inputs must be
isolated. Maximum load per unit is
200 ohms.
isolated. Maximum load per unit is
200 ohms.
Analog voltage as well as analog current input signals are accommodated in a
single connector.
single connector.
To connect the analog voltage signal (-4.0 to +4.0 V dc):
1.
Tie ground wire to Pin B (ground).
2.
Tie analog voltage wire to the appropriate voltage input pin
(Pin C, E, or G).
(Pin C, E, or G).
For example, to connect an analog voltage input to analog input channel 1, tie
the ground wire to pin B and your positive wire to pin C.
the ground wire to pin B and your positive wire to pin C.
To connect an analog current signal (4–20 mA dc)
1.
Tie ground wire to Pin B (ground).
2.
Connect analog current wire to both voltage and current input pins for the
appropriate channel (Pin C and D, or E and F, or G and H).
appropriate channel (Pin C and D, or E and F, or G and H).
7.60
7.40
7.20
7.00
6.80
6.60
6.40
pH
Alarm Off
Alarm On
Deadband
Low Alarm Setpoint= 6.9 pH
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