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简单介绍：
The ability to maintain constant-differential pressure drop across a built-in needle valve ensures a constant volumetric flow rate
Maintains constant bubbling rate in liquid level applications,
详情介绍：
Features & Benefits
The ability to maintain constant-differential pressure drop across a built-in needle valve ensures a constant volumetric flow rate
Maintains constant bubbling rate in liquid level applications,eliminating the problems of typical conventional bubbling systems
The ability to produce reasonable purge rates eliminates the need for a supply regulator
Epoxy powder coating provides improved corrosion resistance
Description
The Series 62 Constant-Differential Relays serve as air-flow controllers maintaining a constant air purge for each setting of an integral needle valve.
By maintaining a constant-differential pressure drop across a built-in needle valve (for any flow setting up to 2.1 cu. ft. of air per hour), Series 62 Relays ensure a constant volumetric rate of flow, regardless of variations in process or supply pressure.
The constant-differential pressure across the built-in needle valve is regulated by a spring-loaded diaphragm. This
diaphragm controls the action of the supply-port plunger, which automatically admits supply air to the needle valve at the required rate. Excess purge air bleeds to the atmosphere.
Siemens constant-differential relays eliminate most of the problems encountered in conventional bubbling systems, because:
Each relay holds the bubbling rate constant, thereby maintaining high measurement accuracy
The differential pressure maintained across the needle valve is approximately 1-1/2 psi, which allows wider needle valve openings that are less subject to clogging
Full supply pressure (up to 150 psig) is connected to the purge system for a greater margin of safety
Ordinary air-line impurities have no effect
In addition to the preceding advantages, the Series 62 Constant-Differential Relays ensure reasonable purge rates at all times, because they eliminate the need for a supply regulator. Another safety feature is the automatic exhaust, which bleeds off any excess air caused by the presence of foreign particles on the pilot seat of the supply-port plunger.
Specifications
Supply Pressure：Maximum: 150 psig
Minimum: 5 psi above highest output pressure required
Rotometer Pressure： Maximum: 200 psig (1380 kPa)
Supply Pressure Effect：0.18 scfh (max.) flow change for 25 psi increase of supply
Ambient Temperature Limits：-40 to 180 oF (-40 to 82oC)
-40 to 160 oF (-40 to 71oC) with Rotometer
Materials of Construction：Relay: Aluminum, brass, stainless steel, Neoprene, Buna-N
Rotometer: Stainless steel, Polycarbonate, Borosilicate,glass, Viton, Kynar®
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The ability to maintain constant-differential pressure drop across a built-in needle valve ensures a constant volumetric flow rate
Maintains constant bubbling rate in liquid level applications,eliminating the problems of typical conventional bubbling systems
The ability to produce reasonable purge rates eliminates the need for a supply regulator
Epoxy powder coating provides improved corrosion resistance
Description
The Series 62 Constant-Differential Relays serve as air-flow controllers maintaining a constant air purge for each setting of an integral needle valve.
By maintaining a constant-differential pressure drop across a built-in needle valve (for any flow setting up to 2.1 cu. ft. of air per hour), Series 62 Relays ensure a constant volumetric rate of flow, regardless of variations in process or supply pressure.
The constant-differential pressure across the built-in needle valve is regulated by a spring-loaded diaphragm. This
diaphragm controls the action of the supply-port plunger, which automatically admits supply air to the needle valve at the required rate. Excess purge air bleeds to the atmosphere.
Siemens constant-differential relays eliminate most of the problems encountered in conventional bubbling systems, because:
Each relay holds the bubbling rate constant, thereby maintaining high measurement accuracy
The differential pressure maintained across the needle valve is approximately 1-1/2 psi, which allows wider needle valve openings that are less subject to clogging
Full supply pressure (up to 150 psig) is connected to the purge system for a greater margin of safety
Ordinary air-line impurities have no effect
In addition to the preceding advantages, the Series 62 Constant-Differential Relays ensure reasonable purge rates at all times, because they eliminate the need for a supply regulator. Another safety feature is the automatic exhaust, which bleeds off any excess air caused by the presence of foreign particles on the pilot seat of the supply-port plunger.
Specifications
Supply Pressure：Maximum: 150 psig
Minimum: 5 psi above highest output pressure required
Rotometer Pressure： Maximum: 200 psig (1380 kPa)
Supply Pressure Effect：0.18 scfh (max.) flow change for 25 psi increase of supply
Ambient Temperature Limits：-40 to 180 oF (-40 to 82oC)
-40 to 160 oF (-40 to 71oC) with Rotometer
Materials of Construction：Relay: Aluminum, brass, stainless steel, Neoprene, Buna-N
Rotometer: Stainless steel, Polycarbonate, Borosilicate,glass, Viton, Kynar®
