Type 650 Positive Bias Relay

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.

Specifications

Flow Capacity

50 SCFM (1,500 Nl/min) at 100 psig (7 BAR) supply with 20 psig (1.4 BAR)

Exhaust Capacity

15 SCFM (450 Nl/min). Downstream 5 psig (0.34 BAR) above set pressure

Sensitivity

1/4" (3.2 mm) water column

Effect of Supply Pressure Change

0.1 psi for a 50 psig change

Maximum Supply Pressure

250 psig (17.24 BAR)

Maximum Signal Pressure

150 psig (10.34 BAR)

Maximum Output Pressure

150 psig (10.34 BAR)

Ambient Temperature Limits

40°F to 200°F (-40° C to 93° C)

Weight

1.75 Ibs. (794 gm)

Mounting

pipe, panel or bracket

Ordering

Model Number
Port Size
(NPT)
Output Range

psi

bar
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
1/4"
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
0-1

OPTIONS - Add proper letter onto end of model number:

E - Tapped Exhaust: allows captured exhaust.

Z - Fixed Negative Bias: -4+ psi bias

U - BSP Porting

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