Sensor Maintenance; Depth Sensor Reference Filter Maintenance - Mace HydroMace 3000 Product Manual

14.3 Sensor maintenance

To ensure trouble free data collection, MACE depth sensors should be kept
free of built up debris, silt or grease. This is done by using a stiff bristle brush
and carefully cleaning the sensor head and surrounding area. This process
should be repeated as often as necessary in order to keep the sensors clean.
Also check the sensor cable for physical damage.
WarNINg: For third party sensor maintenance refer to the
documentation supplied with your sensor/s.

14.4 Depth sensor reference filter maintenance

A ceramic depth sensor may be used with the HM3000 to measure the
stream depth/level. This sensor is vented to atmospheric pressure via a vent
tube inside the sensor cable, which passes through a filter before entering
the silica gel canister that is attached to the sensor connector and housed
within the HM3000.
In order to keep the depth sensor working properly, this vent tube must
always remain free from moisture.
The silica gel crystals contained within the reference filter effectively entrap
atmospheric moisture. However, these crystals require changing regularly to
ensure that they are still effective.
The silica gel crystals used in the HM3000 are an indicator type. When fresh
they are a deep blue in colour and when exhausted they are light pink. The
crystals should be replaced when they first appear to be light pink. The
following procedure should be followed to change the crystals:
1. Remove the large rubber stopper on the bottom of the filter housing. (This
is the stopper without the tube attached).
2. Empty the filter chamber of exhausted crystals.
3. Add new crystals (MACE Part No. 590-009) to the filter chamber so that
there is enough room for the rubber stopper to be replaced.
4. Replace the rubber stopper.
ensure that the reference filter tube is not crimped as a blockage will
result in incorrect depth readings from the sensor
the longevity of the silica gel crystals is dependent on the amount of
moisture in the atmosphere in which the instrument is mounted. It is
recommended that the crystals be checked at least on a monthly basis
Do not eat the crystals. Wash hands after use
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