ZDM
4
FM Rev. 11/10
2.2.2
Pressure Loss
Pressure loss is a function of the viscosity of the liquid being metered, and
its rate of flow. Detailed pressure loss information may be found in
Appendix A of this manual.
3.0
Installation Instructions
CAUTION:
For safety reasons, please read the cautionary information located at
the end of this manual, before attempting installation.
3.1
Mechanical Installation
The ZDM is shipped from the factory in two pieces (not counting the electrical
connecting cable or the sensor-mounting plate fastening bolts) consisting of the
mounting plate and the sensor body. We recommend that you install the mounting
plate first, then attach the sensor and finally connect the piping.
3.1.1
Installing the Mounting Plate
The sensor may be rigidly held in place on your installation through use of
the four threaded holes in the base of the mounting plate. These holes are
metric and sized as follows:
ZDM-XX02 to ZDM-XX08:
M6 (6 mm metric)
ZDM-XX09 to ZDM-XX40:
M8 (8 mm metric)
3.1.2
Attaching the Flow Sensor to the Mounting Plate
The sensor comes supplied with a set of four steel bolts and O-rings for
fastening the sensor to the mounting plate.
3.1.2.1
Install the O-rings into the grooves in the body of the sensor.
3.1.2.2
Position the sensor on the mounting plate so that the bolt holes in
the sensor line up with the bolt holes in the mounting plate.
3.1.2.3
Insert the bolts into the bolt holes and thread into mounting plate
until they are finger tight.
3.1.2.4
With an appropriately sized wrench, tighten the bolts to the speci-
fied torque in a diagonal bolt tightening pattern.
3.1.3
Bolt Torque Specifications
The following are the nominal torque specifications for all ZDM bolts.
Meter Model
Torque (N-m)
Torque (lb.-ft.)
ZDM-XX02 to ZDM-XX08:40
29.5
ZDM-XX09 to ZDM-XX20:70
51.6
ZDM-XX40:
120
88.5
