Thermo Scientific AquaSensors
™
AquaTrace
™
Trace DO System User Guide
12
General System Installation Instructions:
1.
Connect the sample chamber outlet to a vented drain.
2.
Connect the process supply to the sample chamber inlet. The sample supply flow rate must be
between 50 and 400 mL/min and the sample pressure must not exceed 60 psi. Use an
appropriate flow or pressure valve to obtain consistent flow.
3.
Connect the appropriate power to the AV38 Remote Display. Route the power line through the
cord grip in the AV38 housing and connect the leads to the appropriate terminals. Follow local
codes and regulations governing the power supply. Refer to the AV38 User Guide for details on
connecting power.
4.
The Trace DO sensor is supplied with the sensor cable connected to the AV38 Remote Display.
If the sensor has been disconnected for any reason, reconnect it to the appropriate terminals.
Follow the connection guide on the AV38 terminals or refer to the sensor set-up section in this
user guide.
5.
Unscrew the sample chamber retaining ring and remove the Trace DO sensor.
6.
Carefully remove the protective cap from the sensor head. Refer to Section 4.1 of this user
guide, the sensor set-up, for detailed information on handling and setting up the sensor.
7.
Insert the sensor back into the sample chamber and tighten the retaining ring.
8.
Open process flow to the sample chamber. Observe the chamber and verify that it purges any
trapped gas and drains properly.
9.
Power up the AV38 Remote Display.
10.
The AV38 Remote Display includes optional host communications, relays and analog outputs
that can be used with various control systems. Refer to the AV38 user guide for detailed
instructions to configure these options.
3.2 Wiring
A DataStick sensor can be configured to operate using one of several standard communications
protocols. A label at the end of the sensor cable identifies the specific communication protocol used by
that sensor. The sensor supplied with the AquaTrace DO system uses the MODBUS RTU protocol
enabling it to communicate with the AV38 Remote Display.
There are two different methods to make the electrical connection between the Trace DO sensor and
the AV38 Remote Display. The sensor can be wired directly to the Remote Display.
In cases where the
AV38 Remote Display is mounted more than 30 feet from the AquaTrace panel, the sensor can be
connected using an interconnect cable and a junction box. The system is supplied with the sensor
directly wired to the Remote Display.
Direct
Connection:
1.
Insert the sensor cable through a watertight cord grip into the AV38 Remote Display. Conduit
holes are located on the base of the AV38 for this purpose.
2.
Connect the sensor wires to the AV38 as shown on the AV38 wiring chart.
Indirect Connection (using extension cable and a junction box):
1.
Insert the sensor cable and interconnect cable through watertight cord grips into the junction
box.
