Reference Manual
00809-0100-4631, Rev BA
April 2007
Rosemount 1154 Series H
3-4
Since the span adjustment affects zero one-fifth as much as the span,
the 0.125 mA increase in span causes a 0.025 mA increase in zero.
Therefore, turn the zero adjustment (at 50 inH
2
O) until the output
reads 20.000 mA. The unit should now be calibrated for 0 to 50 in
H
2
O.
5.
Zero Elevation/Suppression. Elevate zero. Turn screw until the output
reads 4 mA with –75 inH
2
O applied to the high side of the transmitter
(applying 75 inH
2
O to the low side will give the same result). The
output may stop changing before the desired 4 mA reading is
obtained. If this occurs, turn off power to the unit and unplug the
amplifier board (see Figure 5-2 on page 5-6 to locate the amplifier
board). To elevate or suppress zero a large amount, use the following
procedure:
Material
•
Wire: 22-gauge tinned solid copper—Fed Spec QQW343, ASTM B33
•
Solder: 60% tin, 40% lead (60/40)—Fed Spec QQ-S-571
•
Flux: MIL F 14256 Type A; Fed Spec QQ-S-571 Type RA
Method
a. Locate the three turret terminals on the component side of the
amplifier board. Remove any jumper wires between them (see
Figure 3-3).
b. To elevate zero, connect a jumper wire between the middle
terminal and the terminal marked “EZ” (see Figure 3-3, Detail B).
c. Wrap the jumper wire once around each terminal and cut off any
excess.
d. Solder the jumper wire to the terminals using proper electronics
soldering techniques. Clean solder joints thoroughly with isopropyl
alcohol.
e. Plug the amplifier board back in and complete the zero adjustment.
To suppress zero, follow the same procedure, except connect the
jumper wire between the middle terminal and the terminal
marked “SZ” (see Figure 3-3, Detail C).
6.
Recheck full scale and zero and fine tune if necessary.
NOTE
There is some mechanical backlash in the zero and span adjustments, so
there is a dead band when you change the direction of adjustment. Because
of the backlash, the simplest procedure, if the desired setting is overshot, is to
intentionally overshoot a larger amount before reversing the direction of the
adjustment.
Summary of Contents for Rosemount 1154DH
Page 6: ...Reference Manual 00809 0100 4631 Rev BA April 2007 Rosemount 1154 Series H 1 2 ...
Page 10: ...Reference Manual 00809 0100 4631 Rev BA April 2007 Rosemount 1154 Series H TOC 4 ...
Page 12: ...Reference Manual 00809 0100 4631 Rev BA April 2007 Rosemount 1154 Series H 1 2 ...
Page 52: ...Reference Manual 00809 0100 4631 Rev BA April 2007 Rosemount 1154 Series H 6 10 ...
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