Product Overview

P499 Series Electronic Pressure Transducers Product/Technical Bulletin4
Figure 3 shows the wire designations for a P499
transducer used in 0.5 to 4.5 VDC and 0 to 10 VDC
applications.
Figure 4 shows the wire designations for a P499
transducer used in 4 to 20 mA applications.
Figure 5 shows the wire colors for the wire terminations
in the Packard connector plug.
Figure 6 show the pins in the Packard connector
socket on the P499 transducer and the associated wire
color the pins are connected to when the Packard
connector plug is connected to the socket.
Checking Transducer Operation
Before applying power, check all wiring connections.
After applying power, operate controlled equipment
under normal conditions and use a reliable set of
pressure gauges to verify that the transducer and the
associated control are operating properly.
0.5 to 4.5 VDC Ratiometric Versions
The ratiometric versions of the P499 transducer
receive a constant 5 VDC (nominal) supply voltage and
vary the output signal voltage, based on the sensed
pressure. The output voltage varies from 10% to 90%
of the supply voltage, providing a 0.5 to 4.5 VDC
(nominal) signal.
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 3, Table 4, or Table 5.)
3. Measure the voltage between Supply (red) wire
and Common (black) wire. (See Figure 3.) Use this
in Step 3 as the measured supply voltage, V
s.
Figure 3: Wire Designations for 0.5 to 4.5 VDC
and 0 to 10 VDC Transducer Applications
P499 Transducer
for 0.5 to 4.5 VDC
and 0 to 10 VDC
Applications
FIG:p499_vdc_wires
Red Wire = Supply (+)
Black Wire = Common (-)
White Wire =
Connect cable shield lead at one point only; typically
to Common (or ground) at the control.
Output
Figure 4: Wire Designations for 4 to 20 mA
Transducer Applications
P499 Transducer
for 4 to 20 mA
Applications
Note:
The white wire is not used with 4 to 20 mA
transducer models. Isolate and insulate the
white wire in 4 to 20 mA transducer applications.
FIG:p499_4-20ma_wires
Red Wire = Supply (+)
Black Wire = Output (-)
White Wire = Not Used
Connect cable shield lead at one point only; typically
to Common (or ground) at the control.
Figure 5: Wire Terminations by Wire Color at
Packard Connector Plug on Wire Harness
Red Wire
Termina tion
Black Wire
Termina tion
White Wire
Termina tio n
IMPORTANT: The P499 transducer is a precision
sensing device and testing accuracy is typically
beyond the capability of field diagnostic tools.
IMPORTANT: The 0.5 to 4.5 VDC Ratiometric
Transducers are rated for 5.0 ±0.25 VDC, Safety
Extra-Low Voltage (SELV) or Class 2. Exceeding the
supply voltage rating can damage the transducer
and void any warranties.
Figure 6: Pin Terminations at P499 Packard
Connector Socket by Wire Color
Red Wire
Termina tio n
Black Wire
Termina tio n
White Wire
Termina tion