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Pneumatic Volume Boosters, Volume Boosters & Air Relays

Home / Volume Boosters & Air Relays / Type 650 Positive Bias Air Relay

Type 650 Positive Bias Air Relay

Type 650 Positive Bias Air Relay
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PDF Sales Sheet

Instructions

Product Configurator

3D CAD MODELS

  • Description
  • Specifications
  • Ordering Information

Output pressure from input signal plus a preset bias

The Type 650 positive bias relay is a signal operated regulator that provides an output pressure that is the sum of the input signal pressure plus a preset bias. The unit allows flow capaci ties up to 50 SCFM with minimal pressure drop. An aspirator tube at the output maintains the set pressure under varying flow conditions by causing the main supp!y valve to open and close proportionally to the flow demand. There is a choice of four adjustment ranges for the positive bias settings. This unit is most often used for conversion of a low flow control signal to the higher flow requirements of an operating system.

Flow Capacity at 100 psig (7 bar) supply and 20 psig (1.4 bar) output

50 scfm (1415 Nl/min)

Port Size

1/2" BSP, 1/2" NPT, 1/4" BSP, 1/4" NPT, 3/8" BSP, 3/8" NPT

Max. Flow Cv

1

Sensitivity water column

0.25" (3.2 mm)

Supply Pressure Sensitivity

0.1 psig (0.007 bar) for a change of 50 psi (3.4 bar) in supply pressure

Max. Supply Pressure

250 psig (17 bar)

Max. Output Pressure

150 psig (10 bar)

Max. Signal Pressure

150 psig (10 bar)

Ambient Temperature Limits

-40° to 160°F (-40° to 71°C)

Weight

1.75 lbs (635 gm)

Mounting Options

Pipe, Panel, bracket

Body Materials

Aluminium

Other internal Materials

Stainless steel, brass, plated steel, acetal, nitrile, polyester fabric, abs plastic

Model Number Port Size
(NPT)
Bias Range

psi

bar
650-BA 1/4″ 0-2 0-0.14
650-BC 1/4″ 0-15 0-1
650-BD 1/4″ 0-30 0-2
650-BE 1/4″ 0-60 0-4
650-BF 3/8″ 0-150 0-10
650-CC 3/8″ 0-15 0-1
650-CD 3/8″ 0-30 0-2
650-CE 3/8″ 0-60 0-4
650-CF 3/8″ 0-150 0-10
650-DA 1/2″ 0-2 0-0.14
650-DC 1/2″ 0-15 0-1
650-DD 1/2″ 0-30 0-2
650-DE 1/2″ 0-60 0-4
650-DF 1/2″ 0-150 0-10

OPTIONS – Add proper letter onto end of model number:

E – Tapped Exhaust: 1/8″ NPT port allows captured exhaust.

T – Tamperproof Cover – prevents casual adjustment of bias setting.

U – BSP Porting

X – ATEX 2014/34/EU

Z – Fixed Negative Bias: built in -4+ psig bias

 

ACCESSORIES

Mounting Bracket:  P/N: 446-707-025

Pressure Gauge:
0-15 psi P/N: 446-725-003
0-30 psi P/N: 446-725-004
0-60 psi P/N: 446-725-001
0-150 psi P/N: 446-725-002

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