Honeywell Mini-AT, User Manual, Page: 21 / 156

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Page 21
Mini-AT User Guide
Standard Instrument Mounting
The Universal Mounting Bracket (UMB) permits installation of the Mini-AT on American, Rockwell, Romet,
Roots or Schlumberger meters that have an instrument drive. The UMB housing may be rotated about the base
plate so that the instrument and index will face in any of four (4) directions, by removing all four (4) screws which
attach the base plate to the bracket housing. Replace them after you have repositioned the UMB housing.
Refer to Figure 2 and the following procedure when installing the Mini-AT on a meter.
1) Position the universal mounting bracket (UMB) and gasket on the meter
mounting plate. Install the four (4) mounting bolts and tighten.
2) Connect the pressure tubing to the 1/4" NPTF case pressure connector on
the rear of the instrument case.
3) Install the temperature probe slip-along fitting into the thermowell.
4) Insert the temperature probe into the slip-along fitting and tighten.
Meter Rotation
A reversing gear in the Universal Mounting Bracket (UMB) permits either clockwise (CW) or counterclock-
wise (CCW) meter rotation to drive the Mini-AT. Before installing the Mini-AT, note whether the meter’s
drive rotation is CW or CCW. The Mini-AT should be configured to match the meter rotation. In order to
check the instrument rotation:
•
Remove the two slotted-screws holding the transparent index cover
•
Remove the two (2) black thumbscrews and lift out the index. Compare the bevel gear placement with
figures 3 and 4 to determine if the instrument is setup to work with a CW or CCW instrument drive.
Mounting Bolts (4)
Figure 2
Back of a Mini-AT
Case Back
1/4" NPTF Case
Pressure Connector
Plug for Future
Expansion
RS-232 Serial Port
Location of PLog
Transducer (Optional)
Pulse Output
Strain-Relief Fitting
UMB (Back)
Temperature Probe
Armor
Isolation Baseplate