GT-526S Manual Rev F
Page 24
8.3.
Flow Rate Test
The flow rate test verifies the sample flow rate is within tolerance. The reference flow
meter must be non-loading because the vacuum pump can be loaded down by external
restrictions. Met One Instruments sells a suitable flow meter (PN 9801). The flow rate
test follows:
1. Connect a ±3% reference flow meter to the sample inlet nozzle.
2. Start a 5 minute sample.
3. The flow meter reading after ~3 minutes should be 0.1 CFM (2.831 LPM) ±5%.
4. Adjust the flow rate if the error is > ±5% (see section 5.7.1).
8.4.
Annual Calibration
The GT-526S should be sent back to Met One Instruments yearly for calibration and
inspection. The annual calibration cannot be performed by the customer because this
calibration requires specialized equipment and a skilled technician. Met One
Instruments maintains a calibration facility for calibrating particle counters according to
industry accepted methods such as ISO, JIS and NIST. The annual calibration also
includes inspection and preventative maintenance to improve product reliability.
8.5.
Flash Upgrade
GT-526S is firmware upgradeable via the serial connection using a Met One
Instruments flash burn program. Binary files and the flash program must be provided by
Met One Instruments.
