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产品描述
The PHDG-70 and PHDG-71 waterproof dissolved oxygen meters have been designed for use in damp environments and are waterproofed to IP54 standard. Perfect for monitoring oxygen levels in processes, fish farms or for BOD measurements, the PHDG-70 and PHDG-71 come complete with membrane-type oxygen sensor that is temperature compensated over the range of 0 to 40°C (32 to 104°F). Measurements in percent or mg/L. The sensor features screw-on pretensioned membranes to ensure repeatability of results. To record gas uptake, the 4 to 20 mA output can be used to drive a recorder. The PHDG-71 has a built-in alarm system consisting of two totally independent alarm points, each having its own relay and front panel indicator. To provide a fail-safe backup in the event of a power failure, the relays are energized below setpoint.
