How It Works

QarVision™ is an elevator diagnostic tool and a remote elevator monitor. The building manager or technician can set parameters and retrieve data using a laptop in the machine room, elevator car, or lobby.  Or, they can do it from their home or office using the Internet. QarVision will send emails or text messages when operating conditions are out of range. It has a MODBUS interface for communicating with building management systems.


QarVision™ operates in 4 different user-selectable modes: Acceleration TestInspection, Speed, and Ride Quality.

All of the information displayed in the various modes is stored in the QarVision unit and is retrieved on demand as needed. The stored information is analyzed and viewed using the EPM data analysis program.

The Acceleration Test mode records acceleration at a high frequency. It is used as a diagnostic test for problems concerning the motion of the elevator. The real-time graph shows acceleration and deceleration of the elevator. It can also indicate any abnormalities, such as vibration and jerk.

This applicaiton is also used to configure the parameters for detection of the start and end of trips. The green light indicates that an acceleration was detected as part of a trip.

The Inspection Mode shows what the elevator is doing at any instant. It is the main application of the QarVision system and runs unattended. It provides a complete record of the elevator’s operation, trip-by-trip.

The Live View shows all of the current information of the elevator’s operation. This screen is continually updated as fast as the communication mechanism will allow. This is the first application that is viewed whenever an alert is issued.

Speed Mode records the speed throughout each trip. The speed can be measured from anywhere – the elevator car, the ground, or even your office – without using a tachometer! The graph shows the current up or down speed ot the elevator. The information panel shows the data about the current trip and the last completed trip. The trip can be started automatically when the elevator starts to move, or it can be started manually. Energy used is measured if the Machine Room Monitor is installed.

Ride Quality Mode measures the vibration of the elevator car in three dimensions, as well as the jerk, during a trip between floors. It is started and stopped on demand. It implements the ISO ride quality standard.