Analog Signal Units

The Analog signal units allow for either a current or voltage analog output from the sensor.

The different models are:

	Depth Rating	Function
DTU-A	Non-Submersible	DTU and Analog out functions - Current or Voltage out
ACU300	300m	Analog out functions - Current out
ACU1250	1250m	Analog out functions - Current out
AVU300	300m	Analog out functions - Voltage out
AVU1250	1250m	Analog out functions - Voltage out

• The units can be terminated via SubConn or pigtail
  
• The units require power (6 - 40 V) and connection to the analog input of the telemetry unit
  
• The units have RS232 comms which can be used to validate and upgrade the firmware
  

Range

Spec	Range	Notes
pH	2 - 10 pH
Current Output	4 - 20 mA	20 mA = no available value 4 - 19 mA = proportional to pH value
Voltage Output	0 - 5 V	> 4.9 V = no available value 0 - 4.9 V = proportional to pH value

note

The analog units require a 12 V / 250 mA power supply

DTU-A

DTU-A
Picture coming soon!

The DTU-A communicates to the sensor through the RS485 wires.

tip

We recommend a splice kit when connecting the DTU-A to a pigtailed sensor.

1. Make sure the sensor is in autonomous mode
   
2. Connect the DTU-A to the sensor and telemetry unit using the wiring instructions below
   
3. Turn on the power and the sensor will beep
   
4. Wait for first measurement output (until the sensor provides a measurement there is no change on the output)
   

Pin	Connection to Sensor	Connection to Telemetry Unit
Black	Ground	Ground
Red	Power	Power
Green/White	No Function	RS232 Sensor Receive
Green	No Function	RS232 Sensor Transmit
Orange	RS485B	Vout 0-5V / Current Loop
Orange/White	RS485A	Vout 0V / Current Loop

ACU/AVU

ACU/AVU300 and ACU/AVU1250

1. Make sure the sensor is in autonomous mode
   
2. If you have a SubConn terminated unit, connect the sensor to the SubConn end
   If you have a pigtailed terminated unit, connect the sensor using these wiring instructions

caution

Ensure you have the unit connected the correct way round, as per the picture above

3. Connect the unit to the telemetry unit using the wiring instructions below
4. Turn on the power and the sensor will beep
   
5. Wait for first measurement output (until the sensor provides a measurement there is no change on the output)
   

Pin	Function to Telemetry Unit
Black	Ground
Red	Power
Green/White	RS232 Sensor Receive
Green	RS232 Sensor Transmit
Orange	Vout 0-5V / Current Loop
Orange/White	Vout 0V / Current Loop

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