4.2.4 Distance from Sensor
The maximum cable length between the sensor and the transmitter is 1000 ft (300 m).
Brooks supplies 4-wire cable to connect the sensor to the transmitter. The cable is fitted with a
Eurofast
®
connector for connection to the sensor. Cable can be ordered in lengths ranging from 6.5 ft
(2 m) to 500 ft (150 m). For longer cable lengths, contact the factory.
4.2.5 Accessibility for Maintenance
Ensure that the transmitter is mounted in a location that will allow easy access to the terminals and
the front panel.
4.3 Mounting and Removing the Transmitter
The transmitter is designed to be mounted on a 35 mm rail. The DIN rail must be grounded. See
Figure A-3 for dimensions.
If the temperature is above 113 °F (45 °C) and you are mounting multiple transmitters, they must be
mounted at least 0.33 in (8,5 mm) apart. Use an end bracket or end stop to space the transmitters.
See Figure 4-2.
Figure 4-2 Mounting Multiple Transmitters
Example
The transmitter is mounted 350 feet from a DC power supply. If you want to use
16 AWG cable, calculate the required voltage at the DC power supply as follows:
Minimum Supply Voltage = 19.2V + (Cable Resistance x Cable Length x 0.33A)
Minimum Supply Voltage = 19.2V + (0.0080 ohms/ft x 350 ft x 0.33A)
Minimum Supply Voltage = 20.1V
0.33 or greater
(8,5 or greater)
End bracket or end stop
0.33 in (8,5 mm) minimum spacing
Dimensions in
inches
(mm)
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 4 Installing DIN Rail Mount Transmitter
QmBS Sensor / QTA Transmitters
4-3
