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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

3-4150.096   Rev C  09/13   English 

© Georg Fischer Signet LLC  2013 

Cleaning Instructions

1.  Turn the valve body clockwise to the closed position, isolating the 

valve from the system. See fi gure 2.

2. Remove the fl oat assembly by unscrewing the top of the body 
 

and lifting the black cover assembly up. See fi gure 3.

3.  Carefully clean the seat area of any dirt or debris.

4.  Carefully clean any dirt or debris from inside the vent chamber.

5.  Reinstall the clean fl oat assembly, making sure that the O-ring is not 

damaged and is seated properly. See fi gure 3.

6.  Reinstall the black cover assembly on the air release valve body.  

HAND-TIGHTEN ONLY.

7.  Operate by turning the air release valve body counter-clockwise to the 

open position.

 

HAND-TIGHTEN ONLY. See fi gure 3.

8.  For proper operation, make sure that the red vent cap is tightened all 

the way to the stop. HAND-TIGHTEN ONLY.

BLACKCOVER

ASSEMBLY

O-RING

SEAT AREA-

MAKE SURE

AREA IS FREE

OFDIRTAND

DEBRIS

REDVENT CAP

WITH LEAKAGE

GUARD.

VENTLEVER

SPRING

FLOAT

CONSTRUCTED

FOR EASY IN

LINE SERVICE.

SHUTOFFIS

BUILT-INNO

DRAINDOWN

REQUIRED.

Figure 3

 Ordering Information

Part Number

Code

Description

4150-0003

159 001 587

Stilling/Bubble Chamber

3-4150-1

159 001 596

Turbidimeter, White Light, 0 to 1000 NTU/FNU

3-4150-2

159 001 597

Turbidimeter, Infrared, 0 to 1000 NTU/FNU

3-4150-3

159 001 598

Turbidimeter, White Light, 0 to 100 NTU /FNU With AutoClean

3-4150-4

159 001 599

Turbidimeter, Infrared, 0 to 100 NTU/FNU With AutoClean

3-4150-5

159 001 600

Turbidimeter, White Light, 0 to 1000 NTU/FNU With AutoClean

3-4150-6

159 001 601

Turbidimeter, Infrared, 0 to 1000 NTU/FNU With AutoClean

4150-0001

159 001 593

Pressure Regulator

4150-0004

159 001 589

Replacement cuvette with ultrasonic transducer

4150-0005

159 001 595

Tubing Kit:  1-shutoff clamp, 1-backpressure valve, 

2-connecting tubing with fi ttings, 1-drain vent

4150-0007

159 001 602

Replacement cuvette set (3 glass cuvettes)

3-4150.380

159 001 588

Replacement Desiccant

3-4150.381

159 001 613

**Replacement Desiccant cap with gasket 

(Special Order Only)

3-4150.382

159 001 650

Turbidity Lamp Replacement kit, White

3-4150.386

159 001 652

O-ring kit for cuvette

3-4150-24V

159 001 723

**24 Volt Power Supply 

(Special Order Only)

3822-4000

159 001 592

*Formazin Stock Solution, 4000 NTU/FNU, 500 ml

3822-4001

159 001 585

*Calibration Kit, Turbidity, 100, 10 & 0.02 NTU/FNU

3822-4002

159 001 591

*Formazin Stock Kit

3822-4003

159 001 586

*Calibration Kit, Turbidity, 1000, 10 & 0.02 NTU/FNU

** 

signet-specialproduct@georgfi scher.com.

* Material Safety Data Sheets (MSDS) are available online at  www.gfsignet.com

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