CALIBRATION
M5736/0619 IP210A SERIES
A
5
If 4 to 20 mA
0% = 4 mA
25% = 8 mA
50% = 12 mA
75% = 16 mA
100% = 20 mA
3. Turn the “Span” adjusting screw counter-clockwise to increase output.
4. Repeat steps 1& 2 until unit is calibrated.
Reverse Acting
2. Apply the 100% signal to unit and adjust “Span” adjusting screw until output is at the high setpoint.
Forward Acting
1. Apply the 0% input signal to unit and adjust "Zero" adjusting screw until output reaches the high output pressure set-point. Turn
counter-clockwise to increase.
2. Apply the 100% input signal to unit and adjust "Span" adjustment until output pressure is at the low setpoint.
3. Repeat steps 1& 2 until unit is calibrated.
IMPORTANT: Turn the “Span” adjusting screw clockwise to increase output
1. Apply the 0% input signal to unit and adjust the “Zero” adjusting screw to the low setpoint output. Turn screw counter-clockwise to
increase output. If there is no change in output, keep turning adjustment screw counter-clockwise until output begins to rise. It is
imperative that the output pressure be closely monitored as turning the zero screw excessively could damage the flexure.
Note: input percentage refers to the following examples:
Once the transducer has been mounted, and air supply connections finished, the unit's calibration must be checked before placing into
service. Remove rubber plugs to gain access to “ZERO” and “SPAN” adjusting screws. See Figure 3 for “ZERO” and “SPAN” locations. Re-
install rubber plugs after calibration is complete.
SIGNAL IMPEDANCE
INPUT SIGNAL
OUTPUT RANGE
NOMINAL IMPEDANCE
(OHMS)
POTENTIOMETER RV1 SIZE
(OHMS)
4-20mA
3-15 PSIG
180
1000
4-20mA
3-27 PSIG
215
1000
4-20mA
3-120 PSIG
260
1000
4-20mA
2-60 PSIG
225
1000
The input impedance will vary depending upon the potentiometer setting of the “SPAN (RV1)”, (
SEE FIG. 2
). The I/P circuit design consists
of a resistor and potentiometer in parallel with the coil/flexure. The following are some of the nominal impedences that would be measured
across the signal leads of the average calibrated transducer. These values are helpful when determining power requirements and for
troubleshooting.
BLACK
WHITE
RV1
121 Ω
R2
100 Ω @ 25°C
COIL
300 Ω
J2
J1
I / P SCHEMATIC
RT1
R1
68 Ω
FIGURE 2
