546-622-053 Dwyer Instruments Series I/P Current to Pressure Transducer Page 3
1.4 Pneumatic Connections
1.4.1 The 1/4 NPT supply and output ports are marked “IN” and “OUT” respectively on the base of the unit. Clean all
pipe lines to remove contamination before installation. Apply pipe compound to male threads of the air line only.
Avoid getting compound in the air lines.
Clean dry instrument quality air must be used. To insure optimum performance supply pressure should be
regulated. To provide stable inlet pressure and prevent contamination of the internal section of the transducer the
use of an Instrument Air Filter Regulator is recommended.
The two unmarked ports on the base of the unit are gage ports but may be used as alternative output ports. Any
unused ports must be plugged.
1.5 Electrical Connections
1.5.1 Electrical connections are made to the black and white leads extending out from the 1/2 NPT conduit fitting.
When the positive side of the input signal is connected to the black lead, the output pressure will increase as the
input signal increases. For reverse acting mode (increasing input signal decreases output pressure), connect
positive side of the input signal to the white lead.
Figure 1 DIN 43650 Connector
2. OPERATION
2.1 Calibration
2.1.1 Zero and Span should always be checked after mounting. If unit is calibrated in a vertical position and then
mounted at an angle, readjustment of the zero is necessary. To calibrate use the following procedure:
1. Open protective covers to expose zero and span adjustment screws.
2. Connect the recommended air supply to the inlet of the transducer and an accurate pressure gage to the outlet.
3. Connect the electrical input and set the input signal to the minimum value of the range being used
(e.g. 4 mA for a 4-20 mA unit).
4. Observe the output pressure. If necessary adjust zero screw until reaching minimum output pressure setting.
Turn zero screw counter clockwise to increase pressure, clockwise to decrease pressure.
If unable to achieve output during calibration process, turn adjustment screw counter
clockwise for up to 30 revolutions, until output pressure rises.
5. Increase electrical input signal to its maximum value (e.g. 20 mA for a 4-20 mA unit).
6. Observe the output pressure. If necessary adjust the span screw until reaching maximum output pressure setting.
For I/P (current) input models turn span screw counter clockwise to increase pressure,
clockwise to decrease pressure. For E/P (voltage) input models turn span screw clockwise
to increase pressure, counter clockwise to decrease pressure.
7. The Zero and Span adjustments are interactive. After adjusting the span it will be necessary to recheck the zero.
Repeat steps 3-6 until both end points are at the required values.
8. For reverse acting performance interchange the black and white electrical signal leads and carry out the same
procedure as described above. Note that zero will now be set at maximum output pressure and the span will now
be set at minimum output pressure.
Figure 2 Electrical Schematic
NOTE
NOTE
Notes:
1. For 4-20 mA and 10- mA use J1 as positive input.
2. For 10-50 mA change R4 to 100 Ohms.
3. For 1-9 VDC and 0-10 VDC remove R2, use J5 as
positive input.
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