PX751C coplanar transmitter,
$1875, with flange, $150, shown
smaller than actual size.
B-235
PX751C SMART TRANSMITTER
LCD Meter Options
The LCD meter can be digitally
customized by the user to meet
process needs. The meter can be
configured to display engineering
units, percent of range, or custom
user scale, or to alternate between
any 2 of these.
Power Supply
The DC power supply should
provide power with less than 2%
ripple. The transmitter requires a
minimum of 250 Ω of loop resistance
to communicate with a HartTMbased
communicator. With 250 Ω drop, the
transmitter will require a minimum of
16 Vdc to output 20 mA.
Diagnostics and Service
The diagnostic and service functions
listed here are primarily for use after
the transmitter is installed in the field.
The Transmitter Test feature helps
verify that the transmitter is
operating properly, and can be
performed either on the bench or in
the field. The transmitter test
command initiates an extensive
diagnostics routine that can quickly
identify potential electronics
problems. If the transmitter detects
a problem, messages to indicate the
source of the problem are displayed
on the communicator screen.
The Loop Test feature is designed
to verify proper loop wiring and
transmitter output, and should only
be performed after the user installs
the transmitter. This function tests
the output of the transmitter, the
integrity of the loop, and the
operations of any recorders or
similar devices installed in the loop.
Calibration
Calibrating a smart transmitter is
different from calibrating an analog
transmitter. The smart transmitter
requires 3 steps:
⻬ Rerange—sets the 4 and 20 mA
points to the desired pressures.
⻬ Sensor Trim—adjusts the
position of the factory
characterization curve to optimize
the transmitter performance over a
specified pressure range or to
adjust for mounting effects.
PX751C
(Shown Installed with 3-Valve Manifold)
⻬ Analog Output Trim—adjusts the
analog output to match the plant
standard or the control loop.
Advanced Functions
Cloning: Quickly copies the same
configuration to multiple units. The
cloning process involves configuring
a transmitter, saving the configuration
data, then sending a copy of the
data to a separate transmitter.
Multidrop: Communication
between the host and the
transmitter takes place digitally with
the analog output of the transmitter
deactivated. With HartTMsmart
protocol, up to 15 units can be
connected on a single pair of twisted
wires or over leased phone lines.
B
Burst Mode: Provides faster digital
communications to control system
by eliminating the time required
for the control system to request
data from the transmitter. Burst
mode applies only to the
transmission of dynamic data
(pressure and temperature).
Low-Power Option
User-selectable
3-wire 1 to 5 Vdc or 0.8 to 3.2 Vdc
outputs are available with the
low-power option. The digital signal
is superimposed on the voltage
signal, available to any host
conforming to HartTMprotocol.
Low-power units operate on
6 to 12 Vdc with no load.
B-236
PX751C SMART TRANSMITTER
SPECIFICATIONS AND REFERENCE DATA
Specifications
Service:
Liquid, gas and vapor applications
Zero and Span Adjustment:
Zero and span values can be set anywhere
within the range limits stated in tables.
Span values must be greater than or
equal to the minimum span stated in the
range limits tables.
4 to 20 mA Models
Output:
2-wire 4 to 20 mA output, user selectable
for linear or square root; digital process
variable superimposed on 4 to 20 mA
signal, available to any host that conforms
to the HartTMprotocol
Power Supply:
External power supply required. Standard
transmitter operates on 10.5 to 55 Vdc
with no load. A minimum of 250 Ω of loop
resistance is required to communicate
with a Hart
TM
based communicator. With
250 Ω drop, the transmitter will require a
minimum of 16 Vdc to output 20 mA.
Load Limitations:
)
Load (Ω
1935
1500
1000
500
0
10.520304055
Communications require a minimum loop
resistance of 250 Ω.
1
For CSA approval, power supply must not
exceed 42.2 V.
Operating Region
Voltage (Vdc)
42.4
1
Low Power Models
Output: 3-wire 1 to 5 Vdc or 0.8 to 3.2 Vdc
user selectable. Also user selectable for
linear or square root output configuration.
Digital process variable superimposed on
4 to 20 mA signal, available to any host
that conforms to the HartTMprotocol.
Power Consumption:
3 mA, 18 to 36 mW
Minimum Load Impedance:
100 kΩ (V
Indication:
Optional 2-line, 5-digit LCD meter
Overpressure Limits: Transmitters
withstand the following limits without
damage:
Gage/Differential Models (CA/CD):
Range 1:
0 to 2000 psig (0 to 13.8 MPa)
Ranges 2 to 5:
0 to 3626 psig (0 to 25 MPa)
OUT
+ wiring)
Absolute Models (CA):
Range 0: 0 to 60 psia (0 to 413.7 kPa)
Range 1: 0 to 120 psia (0 to 827.4 kPa)
Range 2: 0 to 300 psia (0 to 2070 kPa)
Range 3: 0 to 1600 psia (0 to 11030 kPa)
Range 4: 0 to 6000 psia (0 to 41370 kPa)
High-Process Temperature
Models (HP/HG)
All Ranges, 0 to 3626 psig
(0 to 25 MPa) “T” Style Gage and
Absolute Models (TA/TG):
Range 1: 0 to 750 psia (0 to 5.2 MPa)
Range 2: 0 to 1500 psia (0 to 10.3 MPa)
Range 3: 0 to 1600 psia (0 to 11.0 MPa)
Range 4: 0 to 6000 psia (0 to 41.4 MPa)
Range 5: 0 to 15000 psia (0 to 103.4 MPa)
Static Pressure Limits
Differential Pressure Models Only:
Operates within specification between
static line pressure of 0.5 psia and
3626 psig; 2000 psig for range 1 (ranges
2 and 3 for high-accuracy models)
Burst Pressure Limits:
All Except Type T:
10,000 psig (69 MPa)
Type T:
Ranges 1 to 4: 11,000 psi (75.8 MPa)
Range 5: 26,000 psig (179 MPa)
Failure Mode Alarm: User selectable to
drive output either high or low when gross
transmitter failure is detected
Temperature Limits
Ambient: -40 to 85°C (-40 to 185°F);
with integral meter, -20 to 80°C (-4 to 175°F)
Storage: -46 to 110°C (-50 to 230°F);
with integral meter, -40 to 85°C (-40 to 185°F)
Process Temperature Limits
Differential, Gage and Absolute:
Silicone Fill Sensor1with
Coplanar Flange-40 to 250°F
Side Flange-40 to 300°F
Level Flange
Horizontal Mount-40 to 250°F
Vertical Mount-40 to 300°F
Inert Fill Sensor Option10 to 185°F
High-Temperature Models:
Fill MaterialTemperature Range
D.C. Silicone 200
Inert-50 to 350°F
Neobee M-20
Type “T” Gage and Absolute:
Silicone Fill Sensor
Inert Fill Sensor
1
1
1
1
-40 to 375°F
0 to 375°F
-40 to 250°F
-22 to 250°F
Humidity: 0 to 100% RH
Turn-On Time: Performance within
specifications less than 2.0 seconds after
power is applied
Volume Displacement:
<0.08 cm
3
(0.005 in3)
Damping: User selectable from
0 to 36 seconds for one time constant.
This software damping is in addition to
sensor module response time.
3, 4
2
2
2
2
2
2
PX751H high-process temperature
traditional flange differential and
pressure gage, $2860, shown
smaller than actual size.
All Models
Response Time:
Dead Time (Td): 45 ms nominal
Time Constant (Tc): 55 ms
Update Rate: 20 times/s minimum
Vibration Effect: < ±0.1% of URL per
gram when tested from 15 to 2000 Hz
in any axis relative to pipe-mounted
process connection
Power Supply Effect:
<0.005% of calibrated span per volt
RFI Effects: ±0.1% of span from 20 to
1000 MHz, and field strength up to 30 V/m
Transient Protection (Optional):
Meets IEEE standard 587, Category B
meets IEEE standard 473,
surge withstand capability 2.5 kV crest,
1 MHz waveform
Process Connections (All Except
Level, High-Pressure Gage and
Absolute Models):
1
⁄4-18 NPT on 21⁄8" centers;
1
⁄2-14 NPT on 2, 21⁄8, or 21⁄4" centers
Level Models:
High-Pressure Side: 2, 3 or 4",
Class 150, 300 or 600 flange
50, 80 or 100 mm: PN40 or
High Gage or Absolute Pressure:
1
⁄4-18, 1⁄2-14 female, G1⁄2 A DIN 16288
male (available in stainless steel for
ranges 1 to 4) or autoclave type F-250-C
(pressure relieved
1
⁄4 OD high pressure tube 60° cone;
9
⁄16-18 gland thread;
available in stainless steel for range 5 only)
Wetted Parts:
Flanges: Plated carbon steel standard;
stainless steel, Hastelloy C or Monel
optional (available on PX751C only)
Wetted O-Rings: Glass-filled TFE
Housing: Low-copper aluminum with
polyurethane paint
Cover O-Rings: Buna-N
Note: Calibrations at 20°C (68°F) per
ANSI Z210.1
1
Process temperatures above 185°F (85°C)
require derating the ambient limits by a 1.5:1
ratio (0.06:1 ratio for Type H).
2
104°C ( 220°F) limit in vacuum service;
71°C (130°F) for pressures below 0.5 psia.
3
71°C (160°F) limit in vacuum service.
4
Not available on model PX751CA.
10
⁄16 flange
B-237
COMMERCIAL GRADE—TYPE “C”
DIFFERENTIAL, GAGE, AND ABSOLUTE PRESSURES
Specifications
Differential and Gage CD/CG Models
Accuracy: ±0.075% of span ±0.100%
of span for differential range 1. For
rangedowns greater than 10:1 of URL
(15:1 for differential range 1), accuracy
= ±[0.025 + 0.005 ( URL
(6.9 MPa) for line pressures from
0 to 2000 psi (0 to 13.7 kPa)—can be
calibrated out at line pressure;
±0.2% of URL/1000 psi (6.9 MPa) for
line pressure above 2000 psi (13.7 MPa)
Range 1:
±0.25% URL/1000 psi (6.9 MPa)
Span Error*:
±0.2% rdg/1000 psi (6.9 MPa)
Range 1:
±0.4% rdg/1000 psi (6.9 MPa)
*Ranges 4 and 5 must be field calibrated
Total Performance**:
±0.25% of span for ±28°C (50°F)
temperature changes, up to
1000 psi (6.9 MPa) line pressure,
from 1:1 to 5:1 rangedown
** Total performance is based on the
combined errors of reference accuracy,
ambient temperature effect, and span line
pressure effect.
Stability: ±0.25% of URL for 5 years
for ±28°C (50°F) temperature changes,
up to 1000 psi (6.9 MPa) line pressure
Range 1: ±0.2% URL for 1 year
Mounting Position Effect:
Zero shifts up to 2.5 inH
(0.62 kPa), which can be calibrated out;
no span effect
Weight:
Type C: 6.0 lb (2.7 kg)
Span
RANGES: PX751CD, CG, PD, PG, HD, HG, AND LEVEL MODELS
Standard features include plated carbon steel flange, stainless steel diaphragm, 4 to 20 mA
output with digital signal based on HartTMprotocol, glass-filled TFE O-ring and silicone fill fluid.
Ordering Examples: PX751CD-1-B4, smart differential pressure sensor with coplanar flange
and range of -2.5 to 25 inH2O, 2" pipe mounting bracket, $2330 + 50 = $2380.PX751CG-2-B4, smart gage pressure sensor with coplanar flange and range of
(6.9 MPa) for line pressures from
0 to 2000 psi (0 to 13.7 MPa)—can be
calibrated out at line pressure;
±0.2% of URL/1000 psi (6.9 MPa)
for line pressures above 2000 psi
(13.7 MPa)
Span Error*:
±0.2% of rdg/1000 psi (6.9 MPa)
* Ranges 4 and 5 must be field calibrated.
Stability:
Ranges 2 and 3:
±0.1% of URL
for 12 months
Ranges 4 and 5:
±0.2% of URL
for 12 months
Mounting Position Effect:
Zero shifts up to 5 inH
which can be calibrated out;
no span effect
Weight: 6.2 kg (13.6 lb)
% of span
]
)
O (1.27 kPa),
2
PX751H, high-process
temperature flange,
$2475, shown with
standard stainless steel
side flanges, smaller
than actual size.
AVAILABLE FOR FAST DELIVERY!
To Order (Specify Model Number)
MODEL NO.PRICERANGE (psi)COMPATIBLE METER
GAGE PRESSURE
Standard features include stainless steel side flanges, stainless steel diaphragm, 4 to 20 mA output
with digital signal based on HartTMprotocol, glass-filled TFE O-ring and D.C. 200 silicone fill fluid.
Ordering Examples: PX751HD-2-B6, smart high-process temperature differential pressure
sensor with stainless steel side flanges, D.C. 200 silicone fill and ranging of 2.5 to 250 inH2O and
2" pipe mounting bracket, $2590 + 70 = $2660.PX751HG-4-B6, smart high-process temperature gage pressure sensor with stainless steel
side flange, D.C. 200 silicone fill fluid, 2" pipe mounting bracket and range of 3 to 300 psi,
$2475 + 70 = $2545.
OPTIONS FOR ALL MODELS
SUFFIXPRICEDESCRIPTION
-M$100Low power 1 to 5 Vdc (not avail. w/haz location cert)
-SS155All stainless steel flanges for differential pressure
-IN155Inert fill fluid (N/A on CA models)
-B4502" pipe mounting bracket for coplanar flange
-B6702" pipe mounting bracket for H-style transmitters
-M527551⁄2 digit LCD meter
B
B-239A
SINGLE ISOLATOR—TYPE “T”
DIFFERENTIAL, GAGE, AND
ABSOLUTE PRESSURES
PX751TG, TA GAGE
AND ABSOLUTE
PRESSURE
Vacuum to 10,000 psi
⻬ Gage or Absolute Pressure
⻬ 0.075% Accuracy
⻬ All Stainless Steel
Wetted Parts
⻬ 0.25% Long-Term
(5-Year) Stability
SPECIFICATIONS
“T” Style Gage and Absolute:
Accuracy: ±0.075% of span;
for rangedowns greater than
10:1 of URL, accuracy =
±[0.0075 ( URL
For Absolute Range 0 With Turndown:
>5:1 of URL, accuracy =
±
0.025 + 0.01( URL
[
Total Performance
(Ranges 1 to 4 Only)**:
±0.25% of span for 28°C (±50°F)
temperature changes, from 1:1 to 5:1
rangedown
** Total performance is based on the
combined errors of reference accuracy,
ambient temperature effect, and span line
pressure effect.
Ambient Temperature Effect
per 10°C (50°F):
Spans 1:1 to 30:1:
±(0.025% URL + 0.125% span)
Spans 30:1 to 100:1:
±(0.035% URL + 0.125% span)
Range 0: ±(0.1% URL + 0.25% span)
Range 5: ±(0.1% URL + 0.15% span)
For High-Gage and Absolute
Range 1, Spans 1:1 to 10:1:
±(0.025% URL + 0.125% span)
Spans 10:1 to 100:1:
±(0.05% URL + 0.125% span)
Stability—Low Absolute Model:
Ranges 1 to 5:
±0.1% of URL for 12 months
Ranges 0:
±0.2% of URL for 12 months
Stability—High-Gage
and Absolute Models:
±0.25% of span
for 5 years for
28°C (±50°F)
temperature change
Mounting Position Effect: Zero shifts
up to 0.62 kPa (0.09 psi),
which can be calibrated out;
no span effect
Weight:
1.4 kg (3.0 lb)
Span
)
Span
% of span
]
% of span
]
)
Starts at
$
1680
PX751T, gage or absolute pressure
single input design, 1⁄2 NPT stainless
steel fitting, $2100, shown with meter
option, smaller than actual size.
Standard features include SS diaphragm and 1⁄2 NPT process fitting, 4 to 20 mA output with
digital signal based on HartTMprotocol, glass-filled TFE O-ring and silicone fill fluid.
Ordering Examples: PX751TA-1-B4, smart absolute pressure sensor with stainless steel
input and range of 0.03 to 30 psia and 2" pipe mounting bracket, $2100 + 50 = $2150.PX751TG-2-B4, smart gage pressure sensor with stainless steel input and range of
1.5 to 150 psig and 2" pipe mounting bracket, $1680 + 50 = $1730.
OPTIONS FOR ALL MODELS
SUFFIXPRICEDESCRIPTION
-M$100Low power 1 to 5 Vdc (not avail. w/haz location cert)
-SS150All stainless steel flanges for Type “C”
-IN155Inert fill fluid (N/A on CA models)
-B4502" pipe mounting bracket for coplanar flange
-B6702" pipe mounting bracket for H-style transmitters
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