HLP250
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Hydrostatic Level Probe HLP250 “Quality Matters” Features • Any measurement range from 1 up to 500 m H2O • Integrated internal overvoltage protection circuit Application The HLP250 hydrostatic level probe is applicable to measure liquid levels in tanks, deep wells or piezometers. The HLP160 probe is a specialized device designed to measure water levels in narrow diameter wells. Principles of operation, construction The probe measures liquid levels, basing on a simple relationship between the height of the liquid column and the resulting hydrostatic pressure. The pressure measurement is carried out on the level of the separating diaphragm of the immersed probe and is related to atmospheric pressure through a capillary in the cable. The active sensing element is a piezoresistant silicon sensor separated from the medium by an isolating diaphragm. The electronic ampliﬁer, which works in combination with the sensor, and is meant to standardise the signal, is additionally equipped with an overvoltage protection circuit, which protects the probe from damage caused by induced interference from atmospheric discharges or from associated heavy current engineering appliances. Installation, method of use When lowered to the reference level, the probe may either hang freely on the cable or lie on the bottom of the tank. The cable with the capillary can be extended using a standard signal cable. For the cable connection a special SG cable hanger is recommended. The cable connection should be situated in a non-hermetically sealed box (the internal pressure inside the box should be equal to the atmospheric pressure), preventing water or other contaminants from getting into the capillary. The PP junction box is recommended For systems with long signal transmission lines, it is recommended the using of an additional overvoltage protection circuit in the form of a wall-mounted box which allows the cables connection. When the probe cable is being wound up, the minimum winding diameter should be 30cm and the cable should be protected from mechanical damage. If there is a possibility of turbulence in the tank (for example, because of the mixer operating mixers or a turbulent inﬂow), the probe should be installed inside a screening tube (e.g. made of PVC). If the probe is to be lowered deeper than 100m, the cable should be hanged at steel lifting rope. Cleaning the probe diaphragm by mechanical means is strictly prohibited. How to order Please specify: model, special versions, measuring range, output signal (1-5), cable length Example: HLP250, TR, 0-25 m fuel oil with density 0.83 g/cm³, 4-20 mA, cable length 6 m Date 28-06-16 Speciﬁcations are subject to change without notice Web: www.pci-instruments.com | Email: sales@pci-instruments.com | Tel: +44 (0

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Hydrostatic Level Probe HLP250 “Quality Matters” Technical data for the HLP250 level probe Measuring range Any measuring range 1 / 500 m H2O ( the standard ranges 4, 10, 25, 60, 100 m H2O are recommended) Error due to supply voltage changes 0.005% / V Degree of protection IP68 Material of casing (applicable to both probes) 00H17N14M2 (SS316L) Material of diaphragm HLP250 Hastelloy C276, HLP160 SS316L Cable shield (applicable to both probes) POLYURETHANE Special versions, certificates (not applicable to HLP160) -Teflon, Teflon cable shielding -TR, Response time <30ms -Pt100, Probe with...

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