GF Signet 2450 Pressure Sensor - Manual (Page 4)

Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
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3-2450.090-1 Rev. K 05/13 English © Georg Fischer Signet LLC 2013
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.
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
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.
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 (S 3 L), 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 (S 3 L), 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 (S 3 L), 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 (S 3 L) confi guration/diagnostic tool
+
-
+
-
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
Wire Nut
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.