Murphy PXT Series, Installation Instructions

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Description
The PXT Series pressure transmitters are state-of-the-art instruments providing 4 to
20 mA outputs. They feature a precision micro-machined silicon diaphragm with
fully welded stainless steel pressure port for greater accuracy, stability and a wide
range of compatibility. All wetted parts are 316L stainless steel or Hasteloy C276.
Specifications
Accuracy (Full Scale, Best Straight Line): ±0.25% including non-linearity,
hysteresis and repeatability. Long term stability better than 0.2% FS over
twelve (12) months.
Zero Setting: ±0.5% of full scale (0.25% typical).
Span Setting: ±0.5% of full scale BSL (RSS).
Overpressure/Proof Pressure: 400% for up to 500 psi (3.45 MPa)
[34 Bar]. 200% for higher ranges.
Burst Pressure:
Ranges 0-1000 psi = 600% of full scale or 4000 psi whichever is lower.
Ranges 2000 psi 13.79 MPa) [137 Bar]= 20,000 psi (27.5 MPa) [275 Bar].
Response Time: Frequency response better than 2 kHz.
Storage Temperature: -65 to 200°F (-54 to 93°C).
Operating Temperature: -40 to 180°F (-40 to 82°C).
Compensated Temperature: -20 to 160°F (-29 to 71°C).
Total Thermal Effects Over Compensated Range: ±2% FS TEB.
Physical:
Enclosure: Weather Resistant.
Body: 316 stainless steel. Meets NACE MR01-75.
Wetted Parts: 316L stainless steel or HASTELLOY C276.
Process Connection: 1/4 NPT female.
Electrical Cable: Integral; 60 in. (914 mm); vented.
1/2 in. NPT male conduit connection
Environmental Effect:
Humidity: No effect.
Mounting: Position/orientation has negligible effect.
Reverse polarity protected
Shock: 1000g 1ms Half sine Pulse in each of 3 mutually perpendicular axis
will not affect performance.
Vibration: Effect on output response is less than 0.05% FS/g at 30g Peak
10Hz to 2kHz, limited by 0.05 in double amplitude. (MIL STD 810C
Proc. 514.2-2 curve L).
PXT Power Requirements: Typically 24 VDC is required, using the Loop
Resistance Graph, 9-30 VDC.
PXT Series Transmitter Output: 4–20 mA, 2-wire.
Insulation: Greater than 10 Mohms @ 500 VDC.
RFI Protection: To the European standards of BS EN 50082-2:1991 in
accordance with IEC 801 parts 1 to 6 for suspectibility to EMC and to
BS EN 50081-1992 for emissions.
Voltage Surge/Spike: Protected against a 600 V spike to IEC 60-2. Reverse
polarity protected.
Sealed: Sealed at one atmosphere at sea level for ranges > 1000 psi (6.89
MPa) [68 Bar].
Vented: Vented for ranges < = 1000 psi (6.89 MPa) [68 Bar].
Laboratory Approvals: UL/
C
UL Class I, Div. 1, Groups A, B, C, D. Class II,
Division 1, Groups E, F, G; when installed with approved barrier per draw-
ing 05-08-0754 UL/cUL Class I, Div. 2, Groups A, B, C, D. Class II
Groups E, F, G, non-incendive per drawing 05-08-0754.
Ranges Available
†
PXT Series Pressure Transmitters
Installation Instructions
00-02-0475
Revised
2
0
12
-05
-04
Section 05
Please read the following information before installing .
A visual inspection of this product for damage during shipping is recommended before mounting.
WARNING
This Murphy instrument is susceptible to damage when exposed to
static electrical charges. To avoid damage, observe the following:
✔ ✔
Ground transmitter body before making electrical connections.
✔ ✔
When disconnecting, remove ground connection last.
✔ ✔
Disconnect all electrical power to the machine.
✔ ✔
Make sure the machine cannot operate during installation.
✔ ✔
Follow all safety warnings of the machine manufacturer.
✔ ✔
Read and follow all installation instructions.
Loop Resistance Graph
Supply voltage for the PXT must be within range of 9-30 VDC. The Graph below
shows the minimum supply voltage (VDC) required for a given load resistance (RL).
1500
1000
500
250
10 20 30 40 50 14
V @
250
ohm
0
T
otal Load Resistance (RL)
*
(OHMS)
Power Supply Voltage (VDC)
*
NOTE: Cable resistance effect included in RL.
19V, 500 Ω
29V, 1000 Ω
Under
Voltage
Area
Operating
Area
Over
Voltage
Area
R
R
Listed for Class
I
,
Div. 2, Groups A, B, C, D
and Div. I, Grps. A, B, C, D with a Barrier
Pressure Range
†
:
Specify For this range
30V30WC -30” H20 to +30” H20 (-76 cm H20 to +76 cm H20) [+/-0.075 Bar]
30V30 -30” Hg to +30 psig (-76 cm Hg to 207 kPa) [2.07 Bar]
30V100 -30” Hg to +100 psig (-76 cm Hg to 689 kPa) [6.89 Bar]
15 0-15 psi (103.4 kPa) [1.03 Bar]
60 0-60 psi (413.7 kPa) [4.13 Bar]
100 0-100 psi (689 kPa) [6.89 Bar]
200 0-200 psi (1.38 kPa) [13.78 Bar]
300 0-300 psi (2.07 kPa) [20.67 Bar]
400 0-400 psi (2.75 MPa) [27.56 Bar]
600 0-600 psi (4.14 kPa) [41.34 Bar]
1000 0-1,000 psi (6.89 MPa) [68.9 Bar]
2000 0-2,000 psi (13.79 MPa) [137.8 Bar]
3000 0-3,000 psi (20.69 MPa) [206.7 Bar]
5000 0-5,000 psi (34.48 MPa) [344.5 Bar]
6000 0-6,000 psi (41.37 MPa) [413.4 Bar]
†
NOTE: Conversions are approximate.
Installation 00-02-0475 page 1 of 2