Product Overview

P499 Series Electronic Pressure Transducers Product/Technical Bulletin 5
4. Use the equation in Figure 7 to determine the
calculated output voltage for the ratiometric
transducer.
5. Using your multimeter, measure the DC voltage
between the transducer Output (white) wire and
Common (black) wire. (See Figure 3.) This is the
measured output voltage.
6. Compare the calculated output voltage (Step 4)
and the measured output voltage (Step 5). If the
measured output voltage differs greatly from the
calculated output voltage, replace the transducer.
Note: It is normal for the transducer reading to differ
somewhat from pressure gauge readings due to
voltmeter and gauge tolerances, and other factors.
0 to 10 VDC Versions
To verify that the transducer is working properly:
1. With the transducer in place and the controlled
system pressure stabilized, measure the pressure
at the transducer with an accurate and reliable
gauge. This is the measured pressure (P).
2. Determine the maximum (P
max) and minimum
(P
min) pressure values for the transducer’s
pressure range. (See Table 6.)
3. Use the equation in Figure 8 to determine the
calculated output voltage for the 0 to 10 VDC
transducers.
4. Measure the voltage between the transducer
Output (white) wire and Common (black) wire with
a multimeter set to measure DC voltage. (See
Figure 3.) This is the measured output voltage.
5. Compare the calculated output voltage (Step 3)
and the measured output voltage (Step 4). If the
measured output voltage differs greatly from the
calculated output voltage, replace the transducer.
Note: It is normal for the transducer reading to differ
somewhat from pressure gauge readings due to
voltmeter and gauge tolerances, and other factors.
4 to 20 mA Versions
To verify that the transducer is working properly:
1. With the transducer in place and the controlled
system pressure stabilized, measure the pressure
at the transducer with an accurate and reliable
gauge. This is the measured pressure (P).
2. Determine the maximum (P
max) and minimum
(P
min) pressure values for the transducer’s
pressure range. (See Table 7.)
3. Use the equation in Figure 9 to determine the
calculated output current for the 4 to 20 mA
transducers.
4. Measure the P499 transducer output current. To
measure the P499 Output current: Disconnect the
P499 Output (black) wire from the control input
terminal. Set your multimeter to milliamperes (mA).
Then connect the multimeter’s red test-lead to the
P499 Output (black) wire and the multimeter’s
black test-lead to the control input terminal. The
milliamperes (mA) reading on your multimeter is
the measured output current.
5. Compare the calculated output current (Step 3) to
the measured output current (Step 4). If the current
from measured output current differs greatly from
the calculated output current, replace the
transducer.
Note: It is normal for the transducer reading to differ
somewhat from pressure gauge readings due to
multimeter and gauge tolerances, and other factors.
Figure 7: Voltage Calculation for 0.5 to 4.5 VDC
Ratiometric Transducers
P - (P )
min
V
= V 0.1 + 0.8 VDC
os [] ( )
V = Calculated Output Voltage
V = Measured Supply Voltage
P = Measured Pressure
P = Maximum Pressure Value
P = Minimum Pressure Value
o
s
max
min
FIG:idl_ratiometric
Figure 8: Voltage Calculation for 0 to 10 VDC
Transducers
V = Calculated Output Voltage
P = Measured Pressure
o
P = Maximum Pressure Value
P = Minimum Pressure Value
max
min
FIG:idl_10V
V
= 10 VDC
o ( )
P - (P )
min
Figure 9: Current Calculation for 4 to 20 mA
Transducers
I = Calculated Output Current
P = Measured Pressure
P = Maximum Pressure Value
P = Minimum Pressure Value
max
min
FIG:idl_mA
I = 4 + 16 mA
( )
P - (P )
min