APM 421

The APM 640 is connected in series to the inlet pipe of RDS as shown in the picture. Pressure readings on the calibrator manometer and flow rate readings on the RDS manometer are taken after inserting each of the five perforated plate/ disks and the calibration factor is calculated after plotting the straight line curve on the X-Y axis.  Stop watch is also supplied for calibration of time.

Calibrator consists of:

• Modular pipe of top loading calibrator.
• Air inlet coupler
• Perforated Plates – 05 Nos.
• Manometer
• Silicon Tubes