Product Overview

P499 Series Electronic Pressure Transducers Product/Technical Bulletin2
Application
P499 Electronic Pressure Transducers provide several
output options:
• 0.5 to 4.5 VDC ratiometric
• 0 to 10 VDC
• 4 to 20 mA
Pressure connections are available in two standard
styles:
• 1/4 in. SAE 45
°
flare (7/16-20 UNF) internal thread
fitting with Schrader® valve depressor (Style 47)
• 1/8-27 NPT external thread fitting (Style 49)
Contact your local Johnson Controls/PENN
®
representative for more information on options
available for high-volume orders with specific
application requirements, including 316L stainless steel
construction and pressure ranges up to
1,764 psi (120 bar).
Typical applications include:
• HVAC and refrigeration applications
• chillers
• fan speed controls
• pumps and compressors
• agricultural applications
• industrial process control
Operation
Pressure applied to the P499 transducer acts on a
piezoresistive strain gauge, which is bonded with high-
temperature glass onto a stainless steel diaphragm.
The strain gauge translates media pressure into an
electrical signal. An Application-Specific Integrated
Circuit (ASIC) conditions and amplifies the signal. The
output signal varies in direct linear proportion to the
sensed pressure.
Dimensions
IMPORTANT: The P499 Series Electronic
Pressure Transducers are intended to provide an
input to equipment under normal operating
conditions. Where failure or malfunction of the P499
Electronic Pressure Transducer could lead to
personal injury or property damage to the controlled
equipment or other property, additional precautions
must be designed into the control system.
Incorporate and maintain other devices, such as
supervisory or alarm systems or safety or limit
controls, intended to warn of or protect against
failure or malfunction of the P499 Electronic
Pressure Transducer.
Figure 2: Dimensions for P499 Electronic
Pressure Transducers and Wire Harness with
Packard Connectors, in. (mm)
5/16
(8)
Maximum
1/8 in. 27 NPT External Thread (Style 49)
1/4 in. SAE 45 Flare Internal Thread
(7/16-20 UNF) with Depressor (Style 47)
o
See wire harness
ordering information.
FIG:P499dimen
2-11/16
(69)
1/2
(12)
7/8
(22)
Hex
Note: Transducer shown with Packard connectors.
Packard Connector Plug
with Wire Harness