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Korea’s top class Flow and Level Instruments manufacturer with 45 years of history
Overview
HT-100P Series is a Hydrostatic Pressure Type Level Transmitter installing on top or side of tank continuously measures the liquid levels in the tank. It measures hydrostatic pressure and converts it to the current output, DC 4~20mA. It can be widely used in various industries such as PC Tank, Dam Surge Tank, Sluiceway, River and Wastewater without special work.
Characteristics
- Installation on top or side of tank
- Easy installation and maintenance
- No effect by a conductivity or composition change of medium
- High sensitive sensor is used.
- NAMUR NE43 is applied.
Operation Principle and Composition
- Piezoresistive Pressure Transducer is a sensor to continuously measure a hydrostatic pressure of a liquid according to the certain height of the liquid column. Hydrostatic pressure is calculated using the equation given below.
P=p x g x h
[P= Hydrostatic Pressure, p=Density of Liquid, g=Gravity of Acceleration, h=Height of Liquid Column]
- As seen in above equation, if density of liquid does not change, measured hydrostatic pressure is detected as an electric signal proportional to the height of liquid column, since the height of liquid column is only variable.
Specification
Wiring
- When wiring of power supply, + - should be wired correctly.
- Power source should be DC+17V ~ +40V.
- Power should be applied after completion of installation and wiring.
Setting
- Zero/Span adjustment is not required if there is no change of density or measuring range (Factory set according to measuring range and density of the medium).
- Zero/Span can be adjusted within ±10% of full scale if there is any change of density or measuring range caused by change of process condition.
- In order to set 0%, the pressure sensor should be positioned in atmospheric and turn the Zero Volume to current output of 4mA.
- In order to set 100%, the pressure sensor should be installed in the tank with filling of liquid to the desired full range level and turn the Span Volume to current output of 20mA.
| Caution | Maintenance |
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1) Touching or pushing to the diaphragm receiving pressure by anything of sharp object such as awl should be avoided and pay more attention not to damage to the sensor during installation.
2) For signal transmission cable, the shield cable should be used.
3) Except wiring or setting, the housing cover should be always closed.
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1) The Diaphragm should be periodically (about 2-3 months) cleaned using fresh water in order to avoid blockage of the diaphragm by any substance.
2) Zero/Span can be adjusted within ±10% of full scale if there is any change of density or measuring range caused by change of process condition.
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Dimension
◈ Actual product may have a tolerance slightly.
Installation
Below recommendation should be considered when installation.
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Product should be installed at the place far from inlet in order to avoid the malfunction. |
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Protection tube should be applied if there is a flow or slopping of the medium in the tank. |
Valve should be installed between the tank nozzle and sensor when the installation to the side of tank. |
