Qualitrol 930 Rapid Pressure Rise Relays (RPRR)

Complies with UPDATED NERC-PRC-005-6 Standard Enforced as of January 1, 2016

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.


  • 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 0-1mA 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″ NPT male 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


  • Heavy duty transducers for high humidity applications
  • Weather proof enclosure for mounting outside the control cabinet
  • Single sensor or multi-sensor logic
  • Qualitrol 900/910 retrofit mounting plate
  • SCADA outputs (0-1 or 4-20mA

Group Created with Sketch. Applications

For use on transformer and load tap changer tanks to sense dangerous fast or slow (static) pressure increases and provide alarm and trip functions.

you also might be interested in
this product works well with