Max Machinery 286-300 SERIES TRANSMITTERS - Manual (Page 4)

Installation
Mounting: The Model 286 transmitter screws on and off of the flow meter. Due to the random location of
the starting point of the threads, one transmitter will probably not line up with the “in” and “out” ports of the
flow meter like another will. The electrical outlet of the transmitter can be rotated clockwise or counter
clockwise one turn by loosening the clamping screw. See the Transmitter Diagram (next page).
Two flats are provided for installing the transmitter on the flow meter. Care should be taken when installing
and removing the transmitter. The wire of the stator is of fine gauge and can be easily damaged.
Moisture Protection: The Amphenol and the weather-tight, explosion-proof transmitters both have their
circuitry enclosed in a liquid-tight and vapor-tight enclosure. All joints are sealed by welding or O-rings. If
a weather tight condition is desired, either the Amphenol or the weather-tight, explosion-proof transmitter
will work. To seal the weather-tight transmitter, pipe dope must be used on the liquid-tight conduit. If an
explosion proof transmitter is required, a potted seal fitting must be used.
If a transmitter is located outside and is not properly sealed, moisture may form inside the housing. This
will cause the circuitry to give an inaccurate output or, in some cases, no output at all. In the long run, this
will cause corrosion and failure.
Temperature Considerations: High ambient temperatures (> 120°F/ 50°C) should be avoided if possible.
It is a good idea to locate the transmitter away from hot spots such as steam pipes, ovens and heaters. The
electronics of the 286 Series Transmitters are rated for operation up to 80° C (175° F). Because some heat
travels from the flow meter to the transmitter electrical enclosure, the temperature of the electronics is a
function of both the ambient and the flow meter temperature. The graph below shows the relation between
the maximum ambient transmitter temperature and the fluid temperature through the flow meter.
The stator of the 286 transmitters is insulated with an electrical coating that is rated to 130°C which limits
the maximum flow meter fluid temperature to about 130°C (265°F).
Mechanical Installation
286-300-350 © 2002, Max Machinery, Inc. (4)
Transmitter High Temperature Limits
0
10
20
30
40
50
60
70
80
90
0 20 40 60 80 100 120 140 160
Flow Meter Fluid Temp (°C)
Am
b
ie
n
t
T
e
m
p
(°
C)
SAFE
OPERATING
REGION
Stator
Limit
Limit for Transmitter Electronics
Discontinued