Installation Recommendations
The transmitter is a simple device to install . However, the following measures are recommended for reliable, trouble-
free operation:
•
Align pipe accurately . Piping should be accurately aligned and of correct length . The high pressure body of the
transmitter can withstand shock and flow/pressure pulsation . However, the piping should be firmly supported by external
mounting brackets, both upstream and downstream of the meter, to avoid any pipe flexing actions that could reduce
meter life .
•
Use rigid mounting . If the transmitter inlet or outlet are to be rigidly mounted, and the opposing port is to be connected
to flexible hose, the end connected with the flexible hose must be rigidly mounted .
•
Use Teflon® tape for sealing NPT fitting .
•
Install unions . Install a union near the inlet or outlet of the transmitter . This will facilitate quick, easy meter removal and
inspection during periodic maintenance procedures .
•
Ensure the fluid is traveling in the direction of the flow arrow . See
.
OTEE:
N
The MR flow transmitter display board can be rotated 180° for optimal viewing . Simply remove the MR flow
transmitter cover, disconnect the ribbon cable, rotate the display board 180°, reconnect the ribbon cable, and
reinstall cover . See Figure 10 for cover screw tightening sequence .
•
Use at least a 200 mesh (74 micron) filter . The transmitter will allow particulate to pass that would jam most valves and
flow controls . Systems that do not have filtration should be equipped with at least a 200 mesh (74 micron) filter . Most
hydraulic systems already have much finer filtration . Dirt, ferrous metal or sealing agents, such as Teflon® tape may lodge
and cause malfunction . If the meter is jammed at a fixed position, follow cleaning and maintenance instructions .
•
Do not
use thread locking compounds as thread sealant .
•
Do not
install the transmitter near turbulence producing fittings such as elbows, reducers, or close coupled valves . The
transmitter does not require flow straighteners or special lengths of straight inlet/outlet piping to stabilize turbulent
flow patterns . However, to assure maximum operational reliability, avoid installation of elbows, valves and/or reducers
immediately adjacent to the meter inlet .
•
Do not
install the transmitter near fast-acting valves . Fast-acting valves have the potential to create high magnitude
hydraulic pressure spikes . These spikes can damage the internal components of the meter, resulting in inaccuracies
or malfunction .
•
Do not
allow unidirectional transmitters to be operated against the direction of the flow arrow . The standard transmitter
is a unidirectional flow meter . The piston acts as a check valve to block flow in the reverse direction . This causes an
excessive pressure differential, which can result in damage to internal meter components . The transmitter is also available
in a modified design, which offers a reverse flow bypass feature to accommodate bidirectional flow .
OTEE:
N
Transmitters with a reverse flow bypass feature are available . Consult factory for details .
Electrical Connections
Cable may be shortened or lengthened as required for proper installation . The cable is soldered directly to the electrical
connector at the factory .
Cable replacement requires disassembly of the electrical connector .
4
2
1
3
2
1
4
3
Figure 1: 4-pin cable connection
DC Output Connection
Loop Power Connection
No Connection
(-) 4…20 mA Out
0V DC
No Connection
(+) DC Power
(+) 4…20 mA In
0…5 or 0…10V DC Output
No Connection
User Manual
Page 7
November 2013