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Qualitrol Electronic Pressure Monitor, 930

930 Electronic Pressure Monitor

Brand: Qualitrol Company
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Multi-function, electronic pressure monitor with adjustable pressure sensitive sensors that provide rapid pressure rise detection combined with seal-in relay functionality and static pressure monitoring and control.

Features continuous outputs for integration with SCADA systems and remote monitoring.

Optional multi-sensor models provide logic based operation to eliminate nuisance trip alarm potential.
Features
  • Field adjustable fast pressure rise and slow pressure settings
  • User selectable contacts for momentary or seal-in actuation with front panel LEDs status indicators
  • Constant milliamp output proportional to tank pressure for remote indication or for use with SCADA systems
  • 3 transducer versions available with various logic schemes for greater flexibility and reliable trip functionality
  • Detection and protection of dangerous pressure conditions
  • Electronic pressure sensors continuously output current pressure level with logic to detect dangerous rapid pressure and static (slow) pressure change events
  • Local LED indication and relay actuation for rapid pressure and static pressure events
  • Selectable seal-in relay function keeps the indicating LEDs lit and relays (contacts) actuated until manually reset
  • Eliminate nuisance operations with adjustable sensitivity and multi-sensor logic
  • Special models feature 2 of 3 logic to trigger a trip signal only if 2 of the 3 pressure sensors experience a pressure event exceeding set points
  • Adjustable fast (rapid) pressure rise and slow pressure rise set points for custom operation for your particular acceptable risk level
  • Momentary or seal-in actuation of control and alarm signals can be selected
  • Sensors feature individual set points to for control schemes to provide alarms prior to trip signals should a pressure event occur (to alert personnel of nonstandard conditions without tripping the unit)
  • Monitor pressure remotely with SCADA outputs
  • Continuous 0-1 mA or 4-20 mA output signal is supplied from each channel for remote transformer pressure indication or SCADA system integration
  • Up to 9 SPDT relays (6 for fast pressure rise, 2 for slow pressure rise, 1 for power status)
  • Easy to install with retrofit mounting plates and options for many applications
  • Pressure sensors can be mounting via flange mount adapter for retrofit to exiting installations of Qualitrol 900/910 flange mount rapid pressure rise relays
  • Sensors have 1/4" Male NPT fitting for easy mounting or adapting to existing fill ports
  • Sensor are suitable for installation in gas or oil space of transformers
  • Universal power supply accepts any input voltage in the range of 85-265 Vac 50/60 Hz or 110-370 Vdc

Specifications

Brand

Accuracy

  • Fast Pressure: Adjustable within Limits
  • Slow Pressure: 2 % of Span at 25° C (77° F)

Ambient Operating Temperature

  • Control Board: -30° to 72° C (-22° to 162° F)
  • Sensor & Cable: -40° to 85° C (-40° to 185° F)

Dielectric Strength

  • 1,500 Vac Common Mode on TB3-1,2,4-9 to TB3-3 for 60 seconds

Indicator

  • 2 LEDs Per Sensor, Indicating Source of Actuation or Power Status

Input Power

  • Pre-Configured: 120/240 Vac, 50/60 Hz
  • Pre-Configured: 120/250 Vdc
  • Pre-Configured: 36-72 Vdc
  • Universal: 110-370 Vdc
  • Universal: 85-265 Vac, 50/60 Hz

Input Pressure Range

  • psig: 0 to 30 (kPa: 0 to 200, bar: 0 to 2)

Mounting

  • 1/4”-18 NPT Pressure Input Port

Number of Switches

  • Multi-Sensor: 9 SPDT (6 Fast Pressure, 2 Slow Pressure, 1 Power Status)
  • Single Sensor: 3 SPDT (2 Fast Pressure, 1 Slow Pressure) or (1 Fast Pressure, 1 Slow Pressure, 1 Power Status)

Operating Curve

  • Rapid Pressure: Rotary Switch Selectable with 16 Different Settings
  • Slow Pressure: Adjustable from psig: 1 to 15 (kPa: 6.895 to 103.4, bar: 0 to 1) for Actuation

Relative Humidity

  • 10 to 90 % Non-Condensing

Remote Output

  • 0-1 mA (12,000 ohms, Max.
  • 4-20 mA (600 ohms, Max.

Sensor Cable Length

  • 750 feet (228.6 metres) - Max.

Shock

  • 10 Gs Half Sine Pulse, 3 msec, 3 Perpendicular Axis

Switch Rating

  • 120 Vac or 240 Vac: 10 A, 1/3 HP

Transient Suppression

  • 2,500 V Common Mode & Transverse Mode on Input Per ANSI/IEEE C37.90

Vibration

  • 50 / 60 / 100 / 120 Hz at 0.004” Displacement, 3 Perpendicular Axis

Documentation

Data Sheets

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