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Hydro Services HS-35 Hydrostatic Level Sensor

The HS-35, when used with a Dry Nitrogen source and the Gas Chamber Orifice GC01, forms a complete Hydrostatic Level Sensor for measuring water level in dams, rivers, canals and tanks with up to 300m (900ft) of river line and 30m (100ft) of water head. The unit can be used with any pressure transducer.

Hydrological Services HS-35 Hydrostatic Level Sensor

• Self Purging
• Ideal for high silt areas
• Reduced lag between water level rise and orifice pressure
• Long period unattended
• Low maintenance
• No bubble rates to set up
• No bubble rates to set up
• No desiccant or air dryers required
• Compact size
• Easy to install

The Nitro Model HS-35 is designed to be used with a GCO (Gas Chamber Orifice) and
replace conventional bubbler systems.

• Must be used with a GCO
• Can be used with any pressure transducer.

• Automatic Purge sequence :
1. Operate a 3 way valve to isolate the user’s pressure transducer.
2. Switch a valve to connect the dry N2 gas bottle to the GCO.
3. Purge for 1 secs.
4. Monitor the pressure for 25 secs.
5. Switch the valve back to connect the transducer to the GCO.

• Purge when :
1. Every 3 hours (fixed) and
2. When water level rises by more than 100mm (4 inches) or
3. Manual purge by operator.

• Falling water level – excess pressure vents automatically from GCO – no purging required.
• Pressure on transducer is held constant during a purge.
• Operates with a 12V 18Ah Battery, average consumption is 14mA (=> 50 days batt life - based on 7 x 3 hr purges and a 1m (3ft) water level rise per day)
• A small 5 Watt Solar panel is sufficient to keep the battery fully charged.
• Operates with up to 300m (900ft) of river line and 30m (100ft) head of water.

Power :
Operating Voltage : 12V DC Nominal
Recommended Battery : 12V DC Sealed Lead Acid (18Ah) (This will provide approx 50 days continuous operation.)
Low Battery cut-out : 10.0 V DC
Battery recharge recovery : 12.0V DC
Operation Range : Up to 30m (100ft) of water pressure head with a max of 300m (900ft) of river line

Purge :
Gas Line Solenoid Current : 0.6Amps for 1 sec
Solenoid Current : 0.6 Amps for 27 secs
Electronics Quiescent : 10 mA
Average battery consumption : 14mA continuous (based on 7 x 3hr purges and a 1m water level rise per day)
Solar : A small 5Watt solar panel is sufficient to keep the battery fully charged.
Purge Sequence : 1 secs - N2 gas valve 25 secs - solenoid valve
Once every 3 hours (fixed) and when the water level increases by 100mm or a manually initiated purge