P399 Series Electronic Pressure Transducers

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Код документа	p399-series-electronic-pressure-transducers
Група обладнання	P399 Series Electronic Pressure Transducer
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Мова документа	англійська
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Текст документа

Product/Technical P399
Issue Date June 1, 2002

PRODUCT/TECHNICAL BULLETIN

P399 Series Electronic Pressure Transducers

The P399 Series Electronic Pressure Transducers are
compact, economical, rugged, direct-mount pressure
transducers. The P399 transducers produce a
low-voltage analog signal (nominal 0.5-4.5 VDC)
based on the sensed pressure. They are designed for
use in commercial refrigeration and air-conditioning
applications.

The P399 transducers feature welded stainless steel
construction with environmentally sealed electronics.
They resist the effects of wide ambient temperature
swings, high humidity, condensation, and icing. The
transducers are suitable for use with all noncorrosive
refrigerants as well as ammonia.
Figure 1: P399 Electronic Pressure Transducers,
The P399 Series provides transducers in several Style 47 (Left) and Style 49 (Right) Fittings
pressure ranges (up to 750 psis [52 bar]), covering
most common refrigeration and air-conditioning
applications.

Features and Benefits
 Rugged Stainless Steel Provides a durable assembly, eliminates
Construction potential of refrigerant loss due to O-ring
failures; resists Electromagnetic Interference
(EMI) and damage due to physical shock,
vibration, and pressure pulsations

 Environmentally Sealed Withstand the effects of adverse conditions
Electronics associated with typical Heating, Ventilating,
and Air-Conditioning/Refrigeration (HVAC/R)
applications

 Reliable, Repeatable Minimizes service and replacement costs
Performance and Long
Operating Life

 Available in Several Provides a single line of transducers for most
Pressure Ranges refrigeration and air-conditioning application
(up to 750 psis [52 bar]) needs

© 2002 Johnson Controls, Inc. 1
Part No. 24-7664-1873, Rev. A www.johnsoncontrols.com
Code No. LIT-125515
Application Note: If the transducer is used at an altitude above
sea level, use the following equation to determine the
IMPORTANT: P399 Series Electronic Pressure pressure that the sensor is reading:
Transducers are intended to provide input to
operating controls under normal operating Sensor reading = A + B –14.7
conditions. Where failure or malfunction of a P399 A = gauge reading
Electronic Pressure Transducer could lead to an B = local atmospheric pressure
abnormal operating condition that could cause
personal injury or damage to the equipment or other Dimensions
property, other devices (limit or safety controls) or
See Table 1.
systems (alarm or supervisory systems) intended to
warn of, or protect against, failure or malfunction of a
P399 Electronic Pressure Transducer must be
incorporated into and maintained as part of the Red Wire = 5.0 VDC Supply
5/16
control system. Black Wire = Common Maximum
White Wire = Output Signal (8)

P399 Electronic Pressure Transducers provide a
ratiometric analog signal (0.5-4.5 VDC), based on the 1/4 in. SAE Female Flare Fitting
sensed refrigerant pressure, to a variety of pressure Insert with Valve Depressor (Style 47)
controls. P399 transducers are suitable for use with all Plug
noncorrosive refrigerants and may also be used with
other noncorrosive fluid applications. They are also
ammonia compatible.
Pressure connections are available in two standard
styles: 2-1/4
(57) 1-1/16 3/4 in.
 1/4 in. SAE female flare fitting with Schrader® Maximum (27) HEX
valve depressor (Style 47)
 1/8 in.-27 NPT male fitting (Style 49)

Operation
Pressure applied to the P399 transducer transfers to a
silicon oil-filled chamber. A micro-machined silicon 1/8 in.-27 NPT Male Fitting (Style 49)
pressure sensor translates this pressure into an
electrical signal. Figure 2: Wire Harness and P399 Electronic
An Application-Specific Integrated Circuit (ASIC) Pressure Transducers, in. (mm)
conditions and amplifies the signal, producing a
ratiometric output signal. The output signal voltage Installation
varies in direct linear proportion to the sensed See Mounting and Wiring for information on installing
pressure. the P399 Series Electronic Pressure Transducers.
The P399 transducer receives a constant 5 VDC
(nominal) supply voltage and varies the output signal Parts Required
voltage, based on the sensed pressure. The output Unless purchased as a kit (see Table 2),
voltage varies from 10% to 90% of the supply voltage, P399 transducers require wire harnesses for all
providing a 0.5-4.5 VDC (nominal) signal. applications. Use Table 1 to select a wire harness.
The P399 transducer measures pressure as psis Table 1: Wire Harnesses
(compared to a sealed reference of one standard Product Code Length with Pigtail Leads
atmopsphere). The transducer compares sensed Number
pressure to a sealed reference of 14.7 psia.
WHA-P399-200C 6-1/2 ft (2.0 m)
Use this equation to convert psia to psis:
WHA-P399-400C 13 ft (4.0 m)
psis = psia - 14.7
WHA-P399-600C 19-5/8 ft (6.0 m)

2 P399 Series Electronic Pressure Transducers Product/Technical Bulletin
Mounting
The compact, lightweight P399 transducer mounts  Do not run low-voltage cable in conduit or wiring
directly to most refrigeration equipment pressure tap troughs with high-voltage wires.
ports.
 Ensure that the shielded cable is terminated
! according to code and the control’s instruction
sheets.
CAUTION: Risk of Equipment Damage.
Accumulation of oil, liquids, or sediment in
Checkout
the pressure chamber can cause transducer
malfunction. Locate pressure tap points on the top IMPORTANT: The P399 transducer is a
side of the refrigerant lines to reduce risk of precision sensing device and testing accuracy is
equipment damage or malfunction. typically beyond the capability of field diagnostic
tools.

Before applying power, check all wiring connections.
IMPORTANT: When installing the P399 After applying power, operate controlled equipment
transducers, observe all regulations governing the under normal conditions and use a reliable set of
handling and containment of hazardous or regulated pressure gauges to verify that the transducer and the
materials (refrigerants or lubricants). associated control are operating properly.
To verify if the transducer is working properly:
1. With the transducer in place and the controlled
IMPORTANT: Avoid severe pressure
system pressure stabilized, measure the pressure
pulsations on high-side pressure connections by
at the transducer with an accurate and reliable
positioning the transducer away from compressor
gauge.
discharge.
2. Measure the voltage between the transducer OUT
To mount the P399 transducer: and COMMON with a DC voltmeter.
1. Hand thread the P399 transducer to the pressure 3. Use the equation in Figure 3 to calculate the ideal
tap point. output voltage.
2. Tighten the connection using the wrench flats 4. Compare the voltages in Steps 2 and 3. If the
provided to avoid damaging the transducer. voltage from Step 2 deviates substantially from the
value calculated in Step 3, replace the transducer.
3. Perform a leak test on fittings and connections
It is normal for the transducer reading to differ
before putting the system into operation.
somewhat from pressure gauge readings due to
voltmeter and gauge tolerances, and other factors.
Wiring
!
WARNING: Risk of Electrical Shock.
Disconnect power supply before making electrical
connections to avoid possible electrical shock or
equipment damage.

Follow the wiring guidelines given to avoid causing Figure 3: Ideal Voltage Calculation
damage to the transducer and improper equipment
operation: Repairs and Replacement
Do not attempt to repair or recalibrate the P399 Series
 Ensure wiring conforms to the National Electrical
Electronic Pressure Transducers. In case of problems,
Code and local regulations.
contact your nearest Authorized
 Do not apply more than 6 VDC to the transducer. Johnson Controls/PENN™ Distributor or Sales
Representative.
 Do not extend the wiring harness leads more than
250 ft (76 m). Use 22 AWG, 3-wire, shielded cable
to extend wiring harness leads.

P399 Series Electronic Pressure Transducers Product/Technical Bulletin 3
Ordering
Table 2: P399 Pressure Transducer Standard Models
Connector Style Sold As Pressure Range
0-100 psis 0-200 psis 0-500 psis 0-750 psis
(0-6.9 bar) (0-13.8 bar) (0-34.5 bar) (0-51.7 bar)
1/8 in.-27 NPT male Transducer P399AAA-1C P399GAA-1C P399BAA-1C P399CAA-1C
(Style 49) Kit* P399AAA-1-200C  P399BAA-1-200C P399CAA-1-200C
1/4 in. female flare Transducer P399AAC-1C  P399BAC-1C P399CAC-1C
with Schrader valve Kit* P399AAC-1-200C  P399BAC-1-200C P399CAC-1-200C
depressor (Style 47)
* Kits contain transducer packaged with 6-1/2 ft (2.0 m) length wire harness with pigtail leads (WHA-P399-200C).
See Table 1 for information on wire harnesses.

Technical Data
Product P399 Series Electronic Pressure Transducers
Pressure Ranges See Table 2.
Overpressure 3x Pressure Range Maximum; short duration; infrequent, abnormal condition
Burst Pressure 5x Pressure Range Maximum
Vacuum 30 microns (0.03 mm Hg) maximum; short term
Media Compatibility Noncorrosive refrigerants, lubricating oils, ammonia
Supply Voltage 5.00 0.25 VDC ratiometric range, 6.00 VDC maximum
Current Draw 5 mA maximum at 5.0 VDC
Output Signal Ratiometric, 10% to 90% of supply voltage (0.5 to 4.5 VDC nominal)
Direct-Mount Pressure 1/8 in.-27 NPT male (Style 49),
Connections 1/4 in. SAE female flare with Schrader valve depressor (Style 47)
Temperature and Humidity Storage -40 to 257F (-40 to 125C)
Operating -40 to 158F (-40 to 70C)
Refrigerant -40 to 300F (-40 to 149C)
Humidity 0 to 100% RH
Accuracy ±1.5% Span, -4 to 158F (-20 to 70C); ±2.0% Span, -40 to -4F (-40 to -20C)
Materials Connector - Nylon, 30% glass filled
Main Body - Stainless steel all welded construction (304L)
Vibration 10G, 20-2000 Hz maximum
Agency Listings UL Recognized: File Number SA516; CCN’s SDFY2 (US), SDFY8 (Canada)

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult Johnson Controls/Penn Refrigeration Application Engineering at 1-800-274-5676. Johnson Controls, Inc. shall not be
liable for damages resulting from misapplication or misuse of its products.

Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201 www.johnsoncontrols.com

4 P399 Series Electronic Pressure Transducers Product/Technical Bulletin

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