5-1
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 5 Installing Sensor to Transmitter
QmBS Sensor / QTA Transmitters
5.1 Overview
This section describes how to connect Brooks QmBS sensors to QTA transmitters. This section also
describes how to connect the QTA sensor to a remote host, for use in MVD Direct Connect
installations.
5.2 Cable Types
Brooks offers 4-wire cable with a factory-installed Eurofast connector.
5.3 Wiring to FM or DIN Transmitters
To connect the cable, follow the steps below.
1. To connect the cable to the sensor, plug the Eurofast connector onto the top of the sensor
connection.
Attention!
The connector is keyed for appropriate orientation.
2. Identify the wires in the 4-wire cable. The 4-wire cable supplied by Brooks consists of one pair
of 18 AWG (0.75 mm
2
) wires (brown and black), which should be used for the VDC
connection, and one pair of 22 AWG (0.35 mm
2
) wires (blue and white), which should be used
for the RS-485 connection.
3. To connect:
•
To a field-mount transmitter, connect the four wires from the sensor to terminals 1–4 on
the mating connector of the transmitter. See Figure 5-1. Do not ground the shield, braid, or
drain wire(s) at the transmitter.
•
To a DIN rail mount transmitter, connect the four wires from the sensor to terminals 1–4 on
the transmitter. See Figure 5-2. Do not ground the shield, braid, or drain wire(s) at the
transmitter.
Large electromagnetic fields can interfere with
flowsensor communication signals.
Improper installation of cable or conduit can cause
measurement error or flowsensor failure. To reduce the
risk of measurement error or flowsensor failure, keep
cable or conduit away from devices such as transformers,
motors, and power lines which produce large
electromagnetic fields.
CAUTION
