Chapter 2. Installing the DewPro MMR101
8
DewPro MMR101 User’s Manual
2.3.1
Mounting the Unit
CAUTION!
Only trained personnel should install and operate this unit. Be sure to follow all applicable national
electrical codes and safety codes when installing this unit, especially for units installed in hazardous
(classified) locations (IS or XP)
You can mount the MMR101 using a:
• Compression Fitting - when installing into a pipe or container.
• Bracket - when measuring trace humidity in ambient air.
Use the appropriate section that follows to select a mounting location and properly install and mount the MMR101.
2.3.2
Using a Compression Fitting
CAUTION!
If you are installing the DewPro into a pressurized system (up to 10 bar), depressurize the system
before installing or removing the sensor. Pressurized systems require a stainless steel compression
fitting.
1.
If you are installing the DewPro into a pressurized system, mount it after the shut-off valve and then depressurize
the pipe/container.
2.
The MMR101 is supplied with a stainless steel compression fitting with a stainless steel ferrule. If you are supplying
a fitting, it should be a stainless steel compression fitting with the following:
• For insertion into pressurized systems, the fitting should have a 1.471 stainless steel ferrule.
• For un-pressurized systems, the fitting only needs a nylon ferrule; however, a stainless steel ferrule can be used.
3.
Adjust the compression fitting to obtain a minimum sensor immersion depth of 3 in. (75 mm).
4.
Insert the sensor into the pipe/container into the mating connector. Ideally, the sensor tip should be positioned in
the center of the pipe.
CAUTION!
When inserting the sensor into the pipe/container, make sure it does not touch the inside wall
of the pipe/container.
5.
Hand-tighten the nut.
6.
Using a wrench, tighten the nut 1
¼
turns. When tightened properly, the fitting can withstand the specified
maximum pressure.
