Section 6

6.3

4–20 mA Option

 

 

 

 

 

 

The 4–20 mA option provides a current loop for controlling external devices

 

 

 

such as a chart recorder or PC. Either one or both of the 4–20 mA outputs can

 

 

 

be factory installed and are isolated from each other.

 

6.3.1

4–20 mA Connection

 

 

 

 

 

 

The interface has a 3-ft cable with a connector on one end, and a 10-ft cable

 

 

 

with two open wire leads on the other. Insert the connector into the sampler

 

 

 

receptacle labeled “Auxiliary”, located on the left side of the control housing.

 

 

 

On the 10-ft cable, the wire with clear insulation is positive (+) and the wire

 

 

 

with black insulation is negative (-).

 

 

 

 

Table 16 4–20 mA Connections (J18)

 

 

 

 

 

 

 

 

Pin

 

Signal Description

 

Wire Color

 

 

 

 

 

 

 

A

 

Output 1 + (pos)

 

Yellow

 

 

 

 

 

 

 

B

 

Output 1 - (neg)

 

Black

 

 

 

 

 

 

 

C

 

Output 2 + (pos)

 

Red

 

 

 

 

 

 

 

D

 

Output 2 - (neg)

 

Green

 

 

 

 

 

 

Rating:

Isolation Voltage:

Between sampler and either 4–20 mA output: 2500 V ac

Between the two 4–20 mA outputs: 1500 V ac

Maximum Resistive Load: 600 ohm

Output Voltage: 24 V dc - no load

Cable Required

4–20 mA Interface Cable (Cat. No. 2924), 25 ft long, 4-pin connector on one end, tinned wire leads on the other end.

6.3.2 4–20 mA Programming

Note: When the 4–20 mA outputs are disabled and not completely turned off, they will continue to output a steady 4 mA.

1.From the Main Menu, select OPTIONS > ADVANCED OPTIONS > 4–20 mA

OUTPUTS > SELECT.

2.Enable the 4–20 mA outputs by pressing CHANGE CHOICE while in the 4–20 mA output menu.

3.When the display shows the outputs as enabled, press ACCEPT.

4.Choose either OUTPUT A or OUTPUT B. Use the UP and DOWN keys to highlight the choice, then press SELECT.

11:00 AM 21 - APR - 01

4–20 mA OUTPUTS

 

 

SELECT

OUTPUT A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT B

 

 

 

 

 

 

 

 

 

 

RETURN

 

Page 87

8990cm.fm

4–20 mA Option

Page 89
Image 89
Hach 900 MAX manual Section MA Option, MA Connection, 2 4-20 mA Programming, mA Connections J18, Rating

900 MAX specifications

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