Page 1
Signet 2450 Pressure Sensor
0
-40 -20 0 20 40 60 80 100 120
°F°C-40 -4 32 68 104 140 176 212 248
(bar)
(psi)
1.7
3.4
5.2
6.9
8.6
10.3
25
50
75
100
125
150
12.1
175
13.8
200
225
15.5
275
19.0
-XH
-XL
-XU
*3-2450.090-1*
3-2450.090-1 Rev. K 05/13 English
English
1. Description
The 2450 Pressure Sensor has a one-piece injection molded PVDF body and ceramic diaphragm for superior compatibility in corrosive
liquids. These sensors are available with Digital (S
ranges for optimal measurement resolution. Built-in temperature compensation provides outstanding accuracy over a wide operating
range. Versions with 1/2 in. union process connection are best suited for in-line installations.
Integral adapters (sold separately) may be used to create a compact assembly with fi eld mount versions of the 8450 Pressure Transmitter
and the 9900 Transmitter.
2. Specifi cations
General
Compatibility
Digital (S3L) models: 8450, 8900, 9900
4 to 20 mA models: PLC
Wetted materials:
• Sensor housing: PVDF
• Diaphragm: Ceramic
• Seal: FPM
Process connection:
• -3X, -7X:
where X = U, L, or H
Rear connection:
Cable type: 3 cond + shield, 22 AWG
Standard cable length:
• -3X, -7X: 4.6 m (15 ft)
Sensor Accuracy: ±1% of full scale @ 25 °C
Thermal sensitivity shift: ±0.03% of full scale per °C
Shipping weight: 0.3 kg (0.65 lb.)
Electrical
Power Requirements:
• Digital (S
• 4 to 20 mA models: 12 to 24 VDC ±10% regulated
Short circuit & reverse polarity protected
Digital (S
• Type: Serial ASCII, TTL level 9600 bps
• Accuracy: ±1% of full scale @ 25 °C
• Repeatability: ±0.5% of full scale
• Resolution: 0.01 psi (0.001 psi for -XU)
• Update rate: <100 ms
4 to 20 mA output:
• Accuracy: ±32 μA
• Repeatability: ±0.5% of full scale
• Resolution: <5 μA
• Span: Field-scaleable
(see section 6.3 for factory settings)
• Max loop impedance: 100 Ω @ 12 V
325 Ω @ 18 V
600 Ω @ 24 V
• Update rate: <100 ms
• Operating range (Max. pressure for accuracy specifi cations):
-XU 0 to 0.7 bar (0 to 10 psig)
-XL 0 to 3.4 bar (0 to 50 psig)
-XH 0 to 17.2 bar (0 to 250 psig)
3
L) models: 5 to 6.5 VDC ±10%, <1.5 mA
3
L) output:
Safety Instructions
1. Prior to installation or removal:
• Depressurize and vent system
• Drain below sensor level
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
4. Wear safety goggles or faceshield during installation/service.
Table of Contents
1. Description
2. Specifi cations
3. Installation
4. Digital (S
5. 4 to 20 mA Wiring
6. 4 to 20 mA Span
5. Do not alter product construction.
6. Dispose of properly; DO NOT INCINERATE!
7. Ordering Information
USE THE ATTACHED ADHESIVE LABEL TO PRESERVE THE SAFETY INSTRUCTIONS!
3
L) digital output or fi eld-scaleable 4 to 20 mA output. Select from three (3) pressure
• Vacuum range:
-XU -0.1 to 0.7 bar
(-1.5 to 10 psi)
-XL -0.41 to 3.4 bar
(-6 to 50 psi)
-XH -0.96 to 17.2 bar
(-14.6 to 250 psi)
• Proof pressure
(Max. pressure without damage):
-XU 1.4 bar (20 psig)
1
/2 in. Union male thread,
3
/4 in. NPT male thread
-XL 5.2 bar (75 psig)
-XH 20.7 bar (300 psig)
Environmental
• Relative humidity:
0 to 95%
(Non-condensing)
• Storage temperature: -20 °C to 100 °C (-4 °F to 212 °F)
• Operating temperature: -15 °C to 85 °C (5 °F to 185 °F)
Standards and Approvals
• CE
• RoHS Compliant
• Manufactured under ISO 9001 for Quality,
ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.
Declaration of Conformity according to FCC Part 15:
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and,
(2) This device must accept any interference received,
including interference that may cause undesired operation.
China RoHS (Go to www.gfsignet.com for details)
Dimensions
34 mm
¾ in.
NPT
19.1 mm
(0.75 in.)
(1.34 in.)
3-2450-3X, -7X
½ in.
Male
Union
81 mm
(3.18 in.)
97 mm (7.75 in.)
(8450)
Adjustment
96 mm
(3.78 in.)
3-8450, 3-9900-1
3
L) Wiring
216.1 mm (8.5 in.)
(9900-1)
Page 2
3. Installation
Diaphragm
Capillary Tube
Cable gland
Reducer coupling
4-20
mA
FREQ/
DATA
WHT WHT
BLU BLK
N/C RED
SHIELD
SENSOR
INPUT
SHIELD
–
+
FREQ/
DATA
3-8052-1
Integral junction box,
3/4 in. NPT
• Signet 2450 Pressure Sensors are gauge pressure sensors. Gauge pressure sensors
measure the difference in pressure between the process on one side of a diaphragm
and the atmospheric pressure on the opposite side of the diaphragm. A tiny capillary
tube inside the sensor body is used to ensure that the back of the diaphragm remains at
atmospheric pressure. If moisture is allowed to propagate down this tube to the rear of
the diaphragm, the sensor may be damaged.
Important Installation Recommendations
• The ceramic diaphragm is subject to breakage by over-pressure conditions or mechanical contact.
HANDLE WITH CARE. Do not attempt to test the sensor by pressing on the diaphragm.
• Short duration pressure pulses or shocks, called ‘‘water hammer,’’ are generated by a rapid change in fl ow rate caused by the
operation of system components such as compressors, pumps, pistons and valves. Water hammer can reach pressure levels
far exceeding the over pressure rating of our pressure sensors and damage the ceramic diaphragm.
• A pressure snubber is a device for slowing the rate of change of system fl ow. Installation of a properly sized snubber at or
near the input of a pressure sensor will protect it from water hammer damage. Snubbers are available through plumbing and
instrumentation dealers.
• When threading the sensor into a piping system, any backpressure can damage the ceramic diaphragm.
Open nearby valves to relieve any backpressure while threading the sensor into the pipe.
• If the nearby valves cannot be open while threading the
sensor into the pipe, a bleed valve can be installed to
avoid overpressure.
• Make sure there are no air bubbles in the pipe,
particularly if a long and fl exible hose is used to tap
into the process pipe. Air bubbles could cause reading
fl uctuation and errors.
Process Pipe
F
l
e
x
i
b
l
e
h
o
s
No Air Bubbles
Main Valve Closed
e
Bleed Valve Open
3.1 Integral Assembly Sensor Modifi cation
• Modify sensor part number 3-2450 per fi gure 1.
• Apply sealant or PTFE tape to the process connection threads per fi gure 2, after
inspecting threads to ensure integrity. Do not install a sensor with damaged threads.
• Thread the sensor into the 3-8052 mounting kit.
• Tighten the sensor 1½ turns past fi nger tight into the process connection.
152 mm
(6 in.)
3-9900
3-8450
3-9900.396
Angle Adjustment Adapter Kit
• Install 8450 transmitter (refer to 8450 manual for wiring info) or 9900 Transmitter with
Angle Adjustment Adapter (refer to 9900 manual for information).
• The 3-8052 Integral kit includes:
• 3-9000.392-1 liquid tight connector, ½ in. NPT
• Conduit base to attach 8450.
Figure 1
3-8052
Integral mount kit
Figure 2
3.2 In-line Remote Assembly
The optional 3-8052-1 Integral Junction box with ¾ in. process connection offers a
convenient terminal point to extend the 2450 cable over a distance greater than 4.6 m (15 ft).
• The kit includes:
• Conduit base and cap with junction terminals
• 3-9000.392-1 liquid tight connector, ½ in. NPT
To extend the wires longer than 4.6 m (15 ft):
• Modify sensor 3-2450 as described in fi gure 1.
• Terminate the three wires to the terminal board located in the cap assembly.
• Add customer supplied wire to extend the cable.
• Terminate to the transmitter or the 4 to 20 mA input device.
• Apply sealant or PTFE tape to the process connection threads per fi gure 3, after
inspecting threads to ensure integrity. Do not install a sensor with damaged threads.
• Tighten the sensor 1½ turns past fi nger tight into the process connection.
Figure 3
3.3 Tank Installation Options
Submersible:
• Refer to the GF product 3-2250-XX for submersible installations.
Side Tank Mount:
• Install GF ball valve to allow isolation of the sensor for maintenance.
• It is recommended that a 3-8052-1 kit be used to protect the back end of the sensor.
WARNING: Exposing the sensor body to elevated temperatures that are different than
the tank fl uid temperatures will cause inaccurate reading.
2 2450 Pressure Sensor
Page 3
3.4 1/2 Inch Male Union Installation
+
-
+
-
3-8052
3-8050.521
4 to 20 mA
loop monitor
Power Supply
DC 12 - 24 V
Black (Loop +)
Red
White (Loop - )
Shield
Optional
Earth Ground
Loop Input
Loop Input
The 2450-3X and the 2450-7X sensors have a union-style
process connection. To assemble:
1. Slide union nut onto pipe or fl exible tubing.
2. Install end connectors.
3. Hand-tighten union nut to secure.
Pipe
Union Nut
End Connector
O-Ring
Sensor
Refer to Signet Measurement and Instrumentation Product
Catalogue for ordering information.
4. Digital (S3L) wiring
• All models of the 2450 provide
Digital (S3L) output when powered
with 5 VDC.
• Connecting the SHIELD to a direct
earth ground may reduce electrical
noise interference.
• The maximum Digital (S3L) cable
length is dependent upon the
instrument to which the sensor
is connected.
Consult the instrument manual for
wiring details.
• Connect the 2450
cable directly to Digital
3
(S
L) I/O terminals.
3-8052
not supplied
3-9900
3
S
L connector
Optional
Earth ground
SHLD
GND
DATA
V+
Shield
White
Red
Black
3-8900
I/O Module Connector
I/O Module 3-8900.401-X
+5VDC (Black)
Frequency
Input
Freq. Input (Red)
1
GND (Shield)
+5VDC (Black)
Frequency
Input 2
Freq. Input 2 (Red)
OR
S3L
S L (Red)
Input
2
GND (White/Shield)
+5VDC (Black)
S3L
Input
1
GND (White/Shield)
Analog Output 1
(if applicable)
Analog Output 2
(if applicable)
S L (Red)
3-8900.621C
1
2
3
4
5
3
6
7
8
9
3
10
11
+
-
12
13
+
-
14
3-8450
S3L connector
White
GND
IN
V+
Red
Black
White
Red
• When the 2450 includes a
junction box, connect the 2450
terminals to any Digital (S
I/O port as shown.
WHT WHT
BLU BLK
N/C RED
mA
SHIELD
DATA
SENSOR
INPUT
White
Black
Red
Shield
Black
+
SHIELD
–
FREQ/
DATA
Cable gland or
conduit connection
4-20
FREQ/
3-8052-1
3
L)
5. 4 to 20 mA Loop Wiring
• The 2450-7X models provide a 4 to 20 mA loop output when powered with 24 VDC.
• Connecting the SHIELD to a direct Earth ground may reduce electrical noise interference.
• Red wire is not used, do not remove the heat shrink. See Section 6, 4 to 20 mA span adjustment.
5.1 Current Loop With No Junction Box
• Connect the 2450 cable directly to a loop device as shown.
5.2 Current Loop With Junction Box
• When the 2450 includes a junction box, connect the 2450
terminals to the loop device as shown.
Power Supply
DC 12 - 24 V
Loop Input
Loop Input
+
WHT WHT
4-20
BLU BLK
N/C RED
mA
SHIELD
FREQ/
DATA
SENSOR
INPUT
Black
SHIELD
+
–
FREQ/
-
White
DATA
3-8052-1
+
-
32450 Pressure Sensor
Page 4
6. 4 to 20 mA Span Adjustment
The 4 to 20 mA endpoint values are independent of one another and may be adjusted in the fi eld. For example, to reduce the 20 mA
endpoint value from the maximum full scale limit set at the factory, but to allow the 4 mA endpoint to remain at 0 psig, perform only the
steps listed in 6.2 below. NOTE: The RED wire, which is not connected during normal 4 to 20 mA operation, assumes an important role
in the following procedures.
3-8050.521
6.1 To adjust the 4 mA endpoint in the fi eld:
• Carefully remove the heat shrink tube that is protecting the red wire.
• Expose the sensor to the pressure desired to correspond with 4 mA (any
3-8052
pressure in the operating range).
• With power applied as described in Section 5, connect the RED wire to
the WHITE wire for 15 seconds.
(After about 10 seconds the output will drop to 3.6 mA and remain there
until the RED wire is disconnected.)
• Disconnect the RED wire from the WHITE wire; the 4 mA endpoint has
been adjusted.
NOTE: The output will act as a switch if the 4 and 20 mA endpoints are set
very near to the same value.
6.2 To adjust the 20 mA endpoint in the fi eld:
• Expose the sensor to the pressure desired to correspond with 20 mA (any pressure in the operating range).
• With power applied as described in Section 5, connect the RED wire to the BLACK wire for 15 seconds.
(After about 10 seconds the output will rise to 22 mA and remain there until the RED wire is disconnected.)
• Disconnect the RED wire from the BLACK wire; the 20 mA endpoint has been adjusted.
NOTE: The output will act as a switch if the 4 and 20 mA endpoints are set very near to the same value.
Minimum span is ±2% of maximum range.
• After adjusting the 4 to 20 mA span, protect the red wire by installing the provided wire nut.
• For easier re-spanning use the Signet 0250 USB to Digital (S
3
L) Confi guration/Diagnostic Tool.
Black (Loop +)
Red
White (Loop - )
Shield
Optional
Earth Ground
Loop Input
Loop Input
4 to 20 mA
loop monitor
+
-
Wire Nut
+
-
Power Supply
DC 12 - 24 V
6.3 To restore factory span:
• Disconnect power to the sensor. Wait 10 seconds to allow circuit to discharge.
• Connect the RED wire to the WHITE wire.
• Apply power as described in Section 5, but with the RED wire connected to the WHITE wire for 15 seconds.
(After about 10 seconds the output will drop to 3.6 mA and remain there until the RED wire is disconnected.)
• Disconnect the RED wire from the WHITE wire; factory settings have been restored.
• Replace cap on RED wire.
Mfr. Part No. Factory Span
3-2450-7U 4 to 20 mA = 0 to 10 psig
3-2450-7L 4 to 20 mA = 0 to 50 psig
3-2450-7H 4 to 20 mA = 0 to 250 psig
7. Ordering Information
Mfr. Part No. Code Description
3-2450-3U 159 000 683 10 psig, Digital (S3L), 1/2 in. Male Union, 15 ft Cable
3-2450-7U 159 000 906 10 psig, 4 to 20 mA, 1/2 in. Male Union, 15 ft Cable
3-2450-3L 159 000 682 50 psig, Digital (S3L), 1/2 in. Male Union, 15 ft Cable
3-2450-7L 159 000 908 50 psig, 4 to 20 mA, 1/2 in. Male Union, 15 ft Cable
3-2450-3H 159 000 681 250 psig, Digital (S3L), 1/2 in. Male Union, 15 ft Cable
3-2450-7H 159 000 910 250 psig, 4 to 20 mA, 1/2 in. Male Union, 15 ft Cable
3-8050-1 159 000 753 Universal Mount Junction Box
3-8052-1 159 000 755 ¾ in. NPT mount junction box
3-9000.392-1 159 000 839 Liquid tight connector kit, NPT (1 piece)
3-9000.392-2 159 000 841 Liquid tight connector kit, PG 13.5 (1 piece)
3-9900.396 159 001 701 Angle Adjustment Adapter Kit
5523-0322 159 000 761 Cable, 3 conductor + shield, 22 AWG, black/red/white/shield
3-0250 159 001 538 USB to digital (S3L) confi guration/diagnostic tool
WARNING!
Keep wire nut on red
wire when not in use.
Failure to protect the
red wire may cause
the 4 to 20 mA span
to be reset.
Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-2450.090-1 Rev. K 05/13 English © Georg Fischer Signet LLC 2013
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