Honeywell SMV 3000 User Manual page 35

4.2 Mounting SMV 3000 Transmitter,
ATTENTION
Precautions for
Mounting
Transmitters with
Small Differential
Pressure Spans
Figure 9
Spirit
Balance
Center
Section
1/99
The mounting position of an SMV 3000 Transmitter is critical as the
transmitter spans become smaller for the absolute and/or differential
pressure range. A maximum zero shift of 0.048 psi for an absolute
pressure range or 1.5 in H
from a mounting position which is rotated 90 degrees from vertical. A
typical zero shift of 0.002 psi or 0.20 in H
rotation from vertical.
To minimize these positional effects on calibration (zero shift), take the
appropriate mounting precautions that follow for the given pressure range.
For a transmitter with a small differential pressure span, you must
ensure that the transmitter is vertical when mounting it. You do this by
leveling the transmitter side-to-side and front-to-back. See Figure 9 for
suggestions on how to level the transmitter using a spirit balance.
You must also zero the transmitter by adjusting the mounting position
of the transmitter. Refer to start-up procedure in Section 7 for SMV
3000 transmitter model SMA110 and transmitters with small
differential pressure spans.
Leveling a Transmitter with a Small Absolute Pressure Span.
Process
Head
SMV 3000 Transmitter User's Manual
Continued
O for a differential pressure range can result
2
O can occur for a 5 degree
2
23