User Manual

Installation And Maintenance Instructions
Barksdale, Inc., 3211 Fruitland Avenue, Los Angeles, CA 90058-0843 [phone], www.barksdale.com Bullet in N o. 2 721 39- C 6- 26- 02
INTRINSICALLY SAFE PRESSURE TRANSMITTER
445 SERIES445 SERIES
445 SERIES445 SERIES
445 SERIES
W A R N I N G ! READ BEFORE INSTALLATION
Fluid hammer and surges can destroy any pressure transmitter and must always be avoided. A pressure snubber should be installed
to eliminate the damaging hammer effects. Fluid hammer occurs when a liquid flow is suddenly stopped, as with quick closing solenoid
valves. Surges occur when flow is suddenly begun, as when a pump is turned on at full power or a valve is quickly opened.
Barksdale pressure transmitters having a pressure range 2,000 psi and higher have a built in pressure surge protection in the input
port. The designis such that an orifice is made an integral part of the pressure port. Designed with the upstream side of the orifice as
a sharp corner, it acts as a very effective protection. Other orifice devices can be installed upstream of the pressure transmitter in the
piping system for extra protection where the system engineer requires it.
Liquid surges are particularly damaging to pressure transmitters if the pipe is originally empty. To avoid damaging surges, fluid lines
should remain full (if possible), pumps should be brought up to power slowly, and valves opened slowly. To avoid damage from both
fluid hammer and surges, a surge chamber should be installed, and a pressure snubber should be installed on every transmitter.
Symptoms of fluid hammer and surge’s damaging effects:
1. Pressure transmitter exhibits an output at zero pressure (large zero offset). If zero offset is less than 10% FS, user can usually
re-zero meter, install proper snubber and continue monitoring pressures.
2. Pressure transmitter output remains constant regardless of pressure.
3. In severe cases, there will be no output.
TORQUE REQUIREMENTS:
Apply pipe compound sparingly to male pipe threads only. Avoid pipe strain on Transmitter housing by properly supporting and
aligning piping.
Apply wrench to the hex flats of fittings only, then tighten the connection. Adequate support of piping and proper mounting of the
pressure transmitter should be made to avoid excessive shock and vibration.
TORQUE TO 125 - 150 pound inches.
See Control Drawing TD-B77 for Intrinsically Safe Installation
CAUTION: This device should only be installed by service personnel properly trained on
Intrinsically Safe System requirements.
*
Agency Approval
Telemetering Equipment for Use in Hazardous Locations
UL File No. E146589, Guide No. WYMV, WYMV7.
*
Intrinsically Safe Pressure Transmitter for use in
Hazardous Locations, Class I, Groups A, B, C & D,
Class II, Groups E, F & G only when installed in
Accordance with Control Drawing TD-B77.
All models are tested to meet or exceed the published
specifications. The calibration and testing were done using
instrumentation and standards traceable to the National
Institute of Standards and Technology (NIST). Also tested
in accordance with MIL-STD-45662A.
CALIBRATION
HAZARDOUS LOCATIONS
Full scale pressure cycles:
10
8
to 300 psi, 10
7
to 1,000 psi,
10
6
to 7,500 psi
15 g's, 10 to 2000 Hz
(MIL-STD-202, M204, Cond. B)
50 g's, 11 ms (MIL-STD-202,
M213, Cond. G)
1 meter jacketed cable, standard
Calibration Reference Conditions
Ambient Temperature:
Relative Humidity:
Barometric Pressure:
Accuracy (LH&R):
Long Term Stability:
Proof Pressure:
Life, Cycling:
Vibration:
Shock:
Wetted Material:
Electrical Connection:
Pressure Cavity Volume:
Enclosure Rating:
Performance Characteristics
2 times rated pressure range,
or 13,000 psi, whichever is
less
75°F
40 to 60%
29.92 in.Hg.
±0.25%, Best Straight Line
(BSL)@75°F
Will repeat within ±0.25% FSO
of original calibration on curve
for 1 year
300 series and 17- 4 PH
stainless steel.
0.075 inches maximum
See alternate connections on back
NEMA 4X
Excitation:
Output:
Zero Output:
Full Scale Output:
Protection:
Loop Resistance:
Temperature Range:
Agency Temp.Code:
Temperature Error:
Weight:
Wiring:
12 to 28 VDC
4 to 20 mA
4 mA, ± 2.0% of FSO @ 75°F
20 mA, ± 1.0% @ 75°F
Reverse polarity protected
See loop resistance chart on back page
Compensated: -40
o
to +160
o
F(-40
o
to 71
o
C)
Operating: -40
o
to 185
o
F (-40
o
to 85
o
C)
T4
±0.01% of FSO/°F over the compensated
range.
5.9 oz (167.5 grams)
H3,H5 Cable T4,T5 Pins
Red (+Excite)
Pin 1
Black (Common)
Pin 2
Drain (Case Ground)
Pin 4
H6 - SJO Cord Wire Code:
White
Black
Green
(+Excite)
(Common)
(Case Ground)
Specifications: