Envco – Environmental Equipment

Field Calibration Device (FCD) Model TB320 was designed in response to field Hydrologists’ requests for a device to check the calibration of Tipping Bucket Rain gauges in the field. It is a light, portable device that allows field calibration tests.

The Field Calibration Device has adopted the same basic principles as the Model TB340 Calibration Unit but operates in a slightly different manner. The Field Calibration Device nozzle is unscrewed from the cylinder, which is in turn filled with water to the very top. The nozzle is then screwed back on the cylinder and placed through the holding plate which sits on the catch of any Tipping Bucket Raingauge. When the cap on the Field Calibration Device is closed, the air is entrapped in the cylinder. When the cap is removed a vacuum is created and the water is released down through the nozzle and into the Tipping Bucket Raingauge.

A preset volume (653ml) water will discharge through the Tipping Bucket Raingauge. This process is to be repeated a second time for an accurate calibration check. The number of tips can be manually counted or stored on the data logger for calibration check evidence and then checked with ‘‘Calibration Specifications’’ to confirm that the results come within the acceptable range.

Ordering Information
FCD - FIELD CALIBRATION DEVICE IN METAL CARRY CASE

FCD51 - METAL CARRY CASE FOR FCD
HS305-20 - FIELD CALIBRATION DEVICE FOR 305MM (12 INCH) DIAMETER GAUGE
TB340 - LABORATORY CALIBRATION RIG
FCD03-50 - NOZZLE FOR TB320/FCD
FCD03-100 - NOZZLE FOR TB320/FCD
FCD03-200 - NOZZLE FOR TB320/FCD
FCD03-300 - NOZZLE FOR TB320/FCD
FCD03-500 - NOZZLE FOR TB320/FCD