Electrical Boundaries; Transmitter Mounting; Figure 6 Maximum Load Of Sf72 - Including Cable Resistance - Michell Instruments SF72 User Manual

SF72 Transmitter User's Manual
2.4.1

Electrical Boundaries

Figure 6
2.5

Transmitter Mounting

Prior to installation of the transmitter, unscrew and remove the black, green or blue
plastic cover and retain for future use. Take care to prevent any contamination of
the sensor before installation (handle the transmitter by the main body only,
avoiding contact with the sensor guard).
The SF72 can be mounted either into a fl ow-through sensor sampling block (optional) or
directly into a pipe or duct. It can be operated at pressures of up to 45 MPa (450 barg
/ 6500 psig) when fi tted with the bonded seal or O-ring provided.
The recommended gas fl ow rate, when mounted in the optional sampling block, is 1 to
5 Nl/min (2.1 to 10.6 scfh). However, for direct insertion applications, gas fl ow can be
from static to 10 m/sec (32.8 fps).
NOTE: Pass the seal over the mounting thread and assemble into the sampling
location, by hand, using the wrench fl ats only. DO NOT grip and twist the
sensor cover when installing the sensor.
When installed, fully tighten using a wrench until the seal is fully compressed and to the
following torque settings:
• G 1/2" BSP
• 3/4" - 16 UNF
• 5/8" - 18 UNF
Michell Instruments
600
500
400
300
200
100
12 14 16
Maximum Load of SF72 - Including Cable Resistance
56 Nm (41.3 ft-lbs)
40 Nm (29.5 ft-lbs)
30.5 Nm (22.5 ft-lbs)
18 20 22 24
Supply Voltage
INSTALLATION
26 28
5