Specifications

Instruction Manual Alpha DO 500

2.3 Connecting Peripherals

2.3.1 Connection Terminals

Remove Back Cover:

Remove the screws from the four corners at the back of the DO Transmitter.

Remove the back cover. The connectors are exposed on the back PCBA as

shown in the Figure 1 below.

Connectors:

x SL2 – 12 to 24 V DC power

x SL1 – Dissolved Oxygen electrode & Temperature probe connections

(wiring has to be done in the detachable connector

SL1

SL2

Figure 1: Outer Side of Back PCBA

SL1 Connections SL 2 Connections

1. DO Input, +ve terminal

1. DC Power Supply +ve

terminal

2. DO Input, -ve terminal

2. DC Power Supply –ve

terminal

3. No Connection 3. No Connection

4. No Connection

5. PT100 Compensate

(Short to pin 6 for 2-wire

RTD)

6. PT100 Sense

7. PT100 Ground

8. No Connection