S.A.F.E.air Cabin Pressure Monitoring

The S.A.F.E.air  cabin pressure monitor measures pressure inside the cab and compares it with atmospheric pressure. When the pressure in the cab drops to a level that is not high enough to prevent dust and other materials entering the cab, the display turns red and triggers an audible alarm output to alert the operator. Pressure alarm points and delay times are user definable.

Cabin Pressure Monitoring

  • Highly Visible Colour Display
  • Under & Over Pressure Warnings
  • User-Definable Settings
  • Real-Time Pressure Readout
  • External Output for connection to Mine Health Systems
  • 12 / 24 Volt  Operation
  • Filter Unit Control  Optional
  • Diagnostics   Optional
  • Password Protected
Cabin Pressure Monitoring
Generation 1 Cabin Pressure Monitor Generation 1 Cabin Pressure Monitor
Generation 2 Cabin Pressure Monitor Generation 2 Cabin Pressure Monitor

Cabin Pressure Monitoring

Overview

The touchscreen cab pressure monitor measures pressure inside the cab and compares it with atmospheric pressure. When the pressure in the cab drops to a level that is not high enough to prevent dust and other materials entering the cab, the display turns red and triggers an audible alarm output to alert the operator. Pressure alarm points and delay times are user definable.

A precision sensor allows pressure to be measured to a resolution of 1Pa or 0.1mm H2O. Measured pressure is temperature compensated to allow operation over a wide range of temperatures. An extremely high sensor burst pressure of 5000Pa means that door slams will not affect the sensor.

Push fittings allow for easy, reliable installation of the tube to the outside atmosphere. A filter is fitted to the end of the sensing tube to keep the sensor clean and dust free.

The pressure monitor is capable of integration with other systems.

  • 0-10 volt analog output for telemetry systems

  • Dusttrak monitor alarm input

  • Spare user definable alarm input

  • PID pressuriser control

  • RS232 card reader for use instead of the password screen

  • RS485 Communication bus used on Work Air Tech electronic control systems

Operation

Overview

The touchscreen pressure monitor will measure cab pressure whenever the unit is powered.

On system start up a white screen displaying system hours since service will be displayed. After several seconds the screen will display the measured cabin pressure. A single tap of the white start up screen will take the user to a password screen to access all user definable settings.

If cab pressure is above the defined minimum the display will show the cab pressure in large white characters. The lower right corner displays the unit of measure i.e. Pa, mm H20, mBar. Across the bottom of the screen in green will be a message saying “System OK” and the time since service will be displayed.

If cab pressure drops below the defined minimum for the defined delay time the characters will turn red and an audible alarm output is triggered to alert the operator. A red message across the bottom of the screen gives the operator the option to tap the screen to silence the alarm. The characters will remain red until the cab pressure rises above the defined minimum. “Underpressure” will be displayed in red if the audible alarm has been silenced.

A maximum pressure can also be defined. This is useful to alert the operator to a pressuriser filter element failure. Removing the restriction of the filter from the pressuriser fan will result in high cab pressure. In this instance the monitor will display “Overpressure” in red and the audible alarm output will be triggered. Tapping the screen will silence the alarm.

On light vehicle electronically controlled filter units the revolving beacon switch is used to determine if the vehicle is on or off site. If the beacon switch is on the audible alarm function is active. If the beacon switch is off “City mode” will be displayed at the bottom of the screen and the audible alarm function is disabled to prevent nuisance alarms.

Electrical Specifications

Operating pressure range: 0-500Pa (0-50mm H2O) Sensor resolution: 1Pa (0.1mm H2O)
Sensor burst pressure: 5000Pa
Voltage: 9-36 Volts

Current consumption: Less than 2W (100mA @ 12V, 50mA @ 24V)

External OC output: Normally open collector, switches to ground if under or over pressure, 200mA limit

Analog output: Range 0-10V, maximum 10mA output current

Environmental SpecificationsOperating temperature: -10°C to 55°C

Physical Dimentions

Dimensions: 90mm(W) x 76mm(H) x 33mm(D) Panel cut out: 77mm(W) x 57mm(H) Attachment: 4 x 4mm

Special Functions and User Definable Settings

To access the settings screen, tap the white screen during system start up.

A password screen will be displayed. Press enter to continue to the settings screen or back to return to the pressure monitor main screen.

The following settings are user definable:

  • High and low pressure alarm points with a timed delay

  • Screen brightness

  • Service data

  • Touchscreen capacitive touch calibration

  • Unit of measure

  • Fan speed control for electronically controlled filter units

  • Pressuriser PID control

  • Setting the password

Unit Of Measurement

Tapping the small arrows on the centre icon will toggle the unit of measure. The monitor can display;

  • Pascals

  • mmH2O

  • in. H2O

  • Millibar

  • Milliatmosphere

  • PSI

  • mmHg

  • in.Hg

Configeration of the Fan

The configure fan switch function is used to set recirculation fan speeds on Work Air Tech electronically controlled filter units.

Configuring the Controller

The configure controller screen can be used to control the pressure output of a pressuriser unit so that it maintains a set pressure inside the cab. Pressing the configure controller icon displays the target pressure, the proportional gain and integral gain used in the PID to control cab pressure.

Setting The Password

Pressing the set password icon will access the set password screen.

Input the desired password and press enter. If a password is set and forgotten the monitor will require reprogramming.

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