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Model 661 Amplifying Relay with Bias

Brand: Siemens AG
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Series 661 Amplifying Relays are fixed-gain force-balance instruments, which incorporate bias adjustment that amplify pneumatic instrument signals.
Features
  • Fixed-gain force and bias adjustment mechanisms amplify pneumatic instrument signals to provide control circuit design flexibility

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Specifications

Brand

Ambient Temperature

  • -40° to 180° F (-40° to 82° C)

Material of Construction

  • Brass
  • Stainless Steel
  • Aluminum
  • Neoprene

Supply Pressure

  • Maximum 80 psig (550 kPa)
  • Minimum 1 psi (7 kPa) Above Max. Required Output
  • Normal 20 psig (140 kPa)

Range Limit

  • 80 psig Max. for Input or Output - Whichever Limits

Overrange Limit

  • 100 psig (690 kPa) at Any Connection

Minimum Output Pressure

  • < 0.1 psig (0.7 kPa)

Ratio Accuracy

  • Within 1 % of Normal Ratio

Linearity

  • ± 1 % of Output Span

Reproducibility

  • Within 0.1 % of Output Span

Response Level

  • 0.2” H₂O (5 mmH₂O)

Flow Capacity

  • 2.2 scfm Min.

Air Consumption

  • 0.15 scfm Max.

Bias Range

  • Direct Acting: +30 psig to -15 psi (210 to -100 kPa)

Documentation

Data Sheets

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