½ in. NPT conduit port
Use 2-conductor shielded cable for cable extensions up to 300m (1000 ft.)
Maintain cable shield through splice.
Black (5 to 24 VDC)
Silver (DC return)
Signet Instruments
Other Brands
Input
Gnd.
10 kΩ
+
5 to 24
VDC
-
black
silver
red
pull-up resistor required (10 kΩ recommended).
Use 2-conductor shielded cable for cable extensions up to 300m (1000 ft.)
Maintain cable shield through splice.
Other
instrument
Blk, sensor
power
Red, freq.
input
Shld,
Gnd
instrument
Red (signal out)
3. Sensor Wiring
SAFETY INSTRUCTIONS
1. Do not remove from pressurized lines.
2. Do not exceed maximum temperature/pressure specifi cations.
3. Wear safety goggles or faceshield during installation/service.
4. Do not alter product construction.
5. Apply sealant or PTFE tape to sensor threads, inspecting threads to ensure integrity.
Do not install a sensor with damaged threads.
10x I.D. 5x I.D.
Inlet
Outlet
Flange
15x I.D. 5x I.D.
Reducer
20x I.D. 5x I.D.
90° Elbow
50x I.D. 5x I.D.
40x I.D. 5x I.D.
25x I.D. 5x I.D.
2 x90° Elbow
2 x 90° Elbow
3 dimensions
Valve/Pump
2. Sensor Mounting Position
Vertical mounting is recommended for best overall performance. Mount at a maximum of 30°
when air bubbles are present. DO NOT mount on the bottom of the pipe when sediments are
present.
1. Location of Fitting
Recommended sensor upstream/
downstream
mounting requirements.
Pipe fi ttings MUST be installed by a certifi ed welder only. Signet will not assume liability of any kind for improper fi tting
installations.
2540 Hot-Tap sensor specifi cations and limitations depend on the lowest maximum rating of the components associated
with the system. For example, if a ball valve in the system is rated at a maximum 100 psi @ 175°F, you must limit the entire
system's maximum pressure/temperature rating to 100 psi @ 175°F. All higher maximum specifi cations MUST yield to the
component with the lowest maximum specifi cation.
Maximum Operating Pressure/Temperature:
• 17 bar (250 psi) @ 82°C (180°F) with standard FPM sensor fi tting O-rings.
• 17 bar (250 psi) @ 100°C ( 212°F) with optional EPDM sensor fi tting O-rings.
Note: Pressure/temperature specifi cations refer to sensor performance in water. Certain chemical limitations may apply.
Chemical compatibility should be verifi ed.
Signet 2540 High Performance Flow Sensor
+30°
0°
Process Pipe
-30°
*3-2540.090*
3-2540.090 D 08/07 English
English
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