The incremental shaft-encoder measures water-level when fitted with a pulley-wheel which rotates with water-level changes when driven by a float and counterweight mechanism connected to the pulley via a wire.

When used in conjunction with Isodaq data loggers, the unit is pulsed powered providing accurate water level measurement with minimum battery power consumption. When installed in a suitable diameter stilling-well high measurement accuracy can be achieved to an overall accuracy of better than +/-2 mm with a resolution of 1mm.

These shaft-encoders are suitable for water-level measurement over relatively small operational range, typically of less than 10 metres, due to the need to set-up a careful balance between the float and counterweight.

The sensor is connected to the Hawk XT telemetry logger via a C22 plug-in sensor card adaptor which conditions the output signal for the pulsed output from the encoder device.

The Shaft-encoder is well-proven in streamflow gauging and flood warning stations in the UK with thousands installed for the Environment Agency and SEPA.

Sensor card for Isodaq loggers - C22

The sensor card is required for all Hawk XT series telemetry loggers.

It is not possible to use this instrument with the new ruggedised Hawk RT GSM logger.