4.3 Current Output Zero Adjustment
While monitoring the current output, and with both pressure ports open to atmosphere, the zero may be
adjusted by turning the zero adjustment screw. (See Diagram 5 for location of zero adjustment.) Factory
settings are:
Unidirectional Pressure Ranges
Bidirectional Pressure Ranges
Zero Adjustment
Output
Zero Adjustment
Output
4mA (0.08 mA)
4-20 mA
12 mA (0.08 mA)
4-20 mA
4.4
Current Output Span Adjustment
Span or full scale output adjustments should only be performed by using an accurate pressure standard
(electronic manometer, digital pressure gauge, etc.) with at least comparable accuracy to the 267 or
267MR transducer (<
±
1% full scale). With full range pressure applied to the high pressure port (reference
port open to atmosphere), the span may be adjusted by turning the SPAN adjustment screw. (See
Diagram 1 for location of Span adjustment.) Factory Settings are:
Unidirectional Pressure Ranges
Bidirectional Pressure Ranges
Span Adjustment
Output
Zero Adjustment
Output
20mA (0.08 mA)
4-20 mA
20 mA (0.08 mA)
4-20 mA
Example 1:
Unidirectional pressure range of 0 to 1” W.C. with 4 to 20 mA output
Apply 1.00” W.C., adjust span to 20 mA (±0.08mA)
Example 2:
Bi-directional pressure range of 5” W.C. with 4 to 20 mA output
Apply 5.00” W.C., adjust span to 20 mA (±0.08mA)
5.0 MODEL 267 OPTIONAL LCD DISPLAY
The 267MR is available with an optional 3-1/2 digit LCD display. The LCD is adjusted at the factory
prior to shipment. The LCD is connected to the zero and span adjustment potentiometers. Therefore,
adjustment of the zero and span according to Section 4 adjusts the LCD display.
6.0 Multi-Range Operation – Model 267MR only
The 267MR is re-rangeable by accessing the switches located internal to the transducer housing. To access
the “Dip” switches, remove the screws on the top of the case and lift off the cover. The “Dip” switches are
located on the electronics board as show in Diagrams 1 and 5. The voltage output version has 5 switches,
while the current version has 4. The location of these switches, “on” (up position) or “off” (down
position) determine what range has been selected. See Table 1 below for switch positions for in.W.C.
Multi-Range units are factory set to the highest range. As an example, an MR2 range is factory set to 0 to
1” W.C.
If the 267MR Range is re-configured from the factory calibration, place the correct range label (enclosed) on
the over label, over the area indicating the factory default range.
Notes: Voltage output is set based upon ordering code. See switch settings below to confirm voltage output.
If it is a 0-5 VDC
output, the
switches are set:
To change the range
to 0 to 0.25 in.WC
with a 0-10 VDC
output change the
switches to:
