GF Signet 2450 Скачать руководство пользователя страница 4

Georg Fischer Signet LLC, 3401 Aerojet 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. H 2/11  English 

 © Georg Fischer Signet LLC  2011 

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) Con

fi

 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.   

Mfr. Part No. 

Factory Span

 

 

 

 

 

 

 

 

                                                          

3-2450-7U 

4 to 20 mA = 0 to 10 psig                                                

 

3-2450-5L 

4 to 20 mA = 0 to 50 psig  

3-2450-7L 

4 to 20 mA = 0 to 50 psig

3-2450-5H 

4 to 20 mA = 0 to 250 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

3-2450-1L 

 

159 000 024 

 

50 psig, Digital (S

3

L), 

3

/

in

.

 NPT, 15 ft Cable   

 

 

3-2450-3L 

 

159 000 682 

 

50 psig, Digital (S

3

L), 

1

/

2

 in. Male Union, 15 ft Cable 

 

 

3-2450-5L 

 

159 000 907 

 

50 psig, 4 to 20 mA, 

3

/

in

.

 NPT, 15 ft Cable

3-2450-7L 

 

159 000 908 

 

50 psig, 4 to 20 mA, 

1

/

2

 in. Male Union, 15 ft Cable 

 

3-2450-1H 

 

159 000 026 

 

250 psig, Digital (S

3

L), 

3

/

in

.

 NPT, 15 ft Cable  

 

 

3-2450-3H 

 

159 000 681 

 

250 psig, Digital (S

3

L), 

1

/

2

 in.Male Union, 15 ft Cable

3-2450-5H 

 

159 000 909 

 

250 psig, 4 to 20 mA, 

3

/

in

.

 NPT, 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 

 

3/4 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)

5523-0322 

 

159 000 761 

 

Cable, 3 con shield, 22 AWG, black/red/white/shield

3-0250   

 

159 001 538 

 

USB to digital (S

3

L) con

fi

 guration/diagnostic tool

 

Loop Input 

 

 

Loop Input 

 

4 to 20 mA loop

monitor

Power Supply

DC 12 - 24 V

+

-

Black (Loop +)

Red

White (Loop - )

Shield

Optional
Earth Ground

3-8052

3-8050.521

WARNING!

Not protecting the 
red wire may cause 
the 4 to 20 mA span 
to be reset.

Wire Nut

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