Cost-optimized, digital, battery-powered water level sensor
| Advantages |
High accuracy and long term stable water level measurement
Ceramic highly overload resp. pressure blow resistive membrane
Food- and drinking water suitable materials
Integrated temperature measurement
Integrated battery for minimum 2 million measurements resp. 10 years operation at a measuring interval of 3 minutes
Measuring rates from 1x per second up to 1x per 100 days
Data memory for up to 216 000 measurement values
Interface head up to 3m water column flood protected
Installation in water level tubes of 1 ¼", at wider level tubes, e.g. 2", a control plumbing by cable light plumbline is possible without deinstallation
Data retrieval directly per PC resp. handheld-PC or wireless remote data transmission per GSM/GPRS
| Application description |
The water level senor with data memory Hydrolog® 3000 is a battery powered system for autonomous measurement of water levels from 1 up to 100m water column and temperatures in liquids, at environmental temperatures from - 25°C to +70°C.
The preferential application fields are water supply and distribution e.g. for measurement tubes, control levels, wells, containers and outstanding waters like lakes and rivers.
The excellent characteristics like highest strength against pressure and pressure blows, high resistance against chemicals and corrosion, very good insensitiveness against temperature shocks and EM interference, highest accuracy and long term stability as well as low influence of temperature makes it possible to use the sensor in various fields with liquids like water, waste water, solvents, oil, sludge, grease, cleaning agents, etc., where levels and temperatures combined with date and time should be surveillanced without having any auxiliary power at the place of installation.
For applications, where food or drink water suitability is necessary, a corresponding variant can be ordered where only suitable materials are used.
Because of many possibilities of adjustment a highest flexibility in the application for control level and especially for pumping test or long term surveillance is given
| Function description |
The liquid contacts directly the ceramic membrane and causes there a deflection of the membrane because of the hydrostatic pressure of the liquid.
At the maximum deflection the membrane contacts a robust ceramic carrier and because of this, the membrane come through over pressure of e.g. 40-times of nominal load at a sensor with a pressure range of 0...1 m water column without damage.
The water level proportional hydrostatic pressure signal of the ceramic membrane and also the temperature proportional signal of an optional integrated temperature sensor is measured by the integrated high-resolution digital electronic according to the adjusted measurement rate and is stored loss protected.
Because of an intelligent store management the internal data memory with a size of 64kB resp. 128kB allows a recording of minimum 21 600 up to maximum 216 000 measurement data sets at exclusive storage of the measurement signal water level.
If water level as well as temperature are recorded, minimum 16 200 up to maximum 162 000 measurement data sets could be stored.
A highly efficient lithium battery that is integrated in the probe ensures the power supply of the device.
The battery life time is conceived for minimum 2.000.000 measurements. This equals a run time of minimum 10 years at a measurement rate of 1x per 3 minutes.
Integrated over voltage protection modules prevents the destruction of the water level sensor caused by atmospheric influences like e.g. thunder strike
| Technichal data |
power supply
power supply: integrated lithium battery
battery life: ≥ 2.000.000 measurement resp.
≥ 10 years with a measuring interval of 1x per 3 minutes
accuracy
level range: 1 m water column up to 100 m water column
units: mWs / cmWs / bar / mbar / mNN / mlowering
Deviation: ≤ 0,1% bzw. 0,25% FS
Measuring range temperature: -25°C ... +70°C
accuracy: ≤ 0,3 Kelvin
data storage
memory capacity:
128 kB: 21.600 ... 216.000 records (water level)
16.200 ... 162.000 records (water level / temperature)
measurement range: one measurement per 1 second to one measurement per 100 days
materials
membrane: ceramic AL2O3 96% (medium contact)
probe: steel1.4404 (AISI 316L) / 1.4571 (AISI 316Ti) (medium contact)
read-out unit: CrNi-Steel
Extension cable: PE Polyethylen (medium contact)
seals: FPM – Fluorelastomer (Viton®), EPDM – Etylen-ethylene- propylene - diene monomer (medium contact)
environmental conditions
ambient temperature: – 25°C...+70°C, ice-free
medium temperatures: – 25°C...+70°C, ice-free
measurement range: 0...1 mWs up to 0...100 mWs