Series: LH - 19 Pages

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Series: LH

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User’s Guide Installation, Operation, Maintenance Instructions LH Series Hydrostatic Level Transmitter

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Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Models & Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 316SS Oil Filled Cable Models & Wiring Diagram (LH840, LH840S & LH850) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 LH840 - Ceramic Sensor & Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . 6 LH842 - Rod or Cable & Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 7 LH842 - Cerarmic Sensor / Rod or Cable &...

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LH Series Hydrostatic Level Transmitters Sitron's LH840 and LH850 Hydrostatic Level Transmitters are specifically designed for depth/level measurements in ground water, deep wells, water towers, rivers, sewage treatment plants and other similar applications. The LH842 models are mounted (Rod or Cable) on a threaded or flanged process connection with an electronic module within the enclosure, providing a Zero/Span adjustment. All of Sitron's Hydrostatic Level Probes have a 4-20mA (2-wire) output signal, are fully temperature compensated within the stated range and are offered with surge...

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L= Insertion length Cable: Polythene Note: Rigid Rod is designated “R” in the Order Code Note: Cable is designated “P” in the Order Code Process Connections Threaded Connections Tri-Clamp Connection TC Connection Rubber Seal Process Connection Flange Connections

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316SS Oil Filled Cable Models & Wiring Diagram LH840/860 LH840S The LH840 and LH850 feature the electronic module and 316SS silicone filled sensing element enclosed in the cylindrical housing located at the bottom end of the cable. LH860 have sensor. All models do not have an enclosed housing or process connection. The more compact design (slimmer diameter) of the LH840S enables the probe to work within pipe diameters as small as 3/4”. Wiring Diagram LH840/ LH840S (2 wire) Power Supply Power Supply Transmitter Transmitter HART Modem Connection Transmitter Blue/Black/ White (-) Power Supply...

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LH840 - Ceramic Sensor & Wiring Diagram LH840 - Ceramic The LH840 - Ceramic Hydrostatic Level Transmitter comes with a thick film capacitive ceramic diaphragm. The benefit of using a ceramic diaphram is that it is resistant to build-up of dirt or debris and is extremely resistant to various chemicals. It is also commonly indicated when suspended solids within the medium are a concern. The 316SS (or PVC) cylindrical body houses the electronic module along with the ceramic sensing element. This model comes with a vented polythene cable and does not have an enclosed housing or process...

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LH842 / Rod or Cable & Wiring Diagram LH842 / Rod or Cable The LH842 with rod is designed for short measurements with a fixed 316S.S. rigid rod, utilizing a 316S.S. silicone filled piezoresistive sensing element. There is no pre-set limit for rigid rod lengths, but the longer the rod gets, the more difficult it is to transport and install. Sitron recommends lengths no greater than 8 feet (2.43 m). For lengths greater than 8 feet (2.43 m) the LH842 with cable, having no pre-set limit on cable lengths, is the ideal solution. The cable version also works well for short measurement...

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LH842 - Ceramic Sensor / Rod or Cable & Wiring Diagram LH842-Ceramic / Rod or Cable The LH842-Ceramic Hydrostatic Level Transmitter utilizes the same capacitive thick film sensing element as the LH840-Ceramic model, but this unit also offers a mechanical connection to the vessel along with an enclosure with Zero and Span adjustment of the measuring range. Offered with either a rigid rod (up to 3 meters) or cable (up to 500m cable length), this model can be used in applications requiring either short insertion lengths or deep level measurement. The LH842-Ceramic Hydrostatic Level Transmitter...

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1) If necessary (models with housing) use PTFE tape or o'rings to seal the system. 2) Before installing, make sure the cable connections are correct and that the line voltage is compatible with the specifications of the equipment. Use reliable cables and make sure they are grounded. Shielded cables prevent interference and changes in the eletronic signal, protecting against false measurement output. Avoid radio frequency interference as it may also cause false signals and even possible malfunction of the transmitter. When possible, keep hand held communication equipment away from the...

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Installation Water Column & Liquid Pressure Types Water Column System MKgfs Measuring Principle The weight of the column of liquid creates a hydrostatic pressure. As the column of liquid will rises (h) the pressure in the vessel will increase and the transmitter will provide a linear output (as long as the density of the product remains constant). (vent tube) Gravity The probe should be installed on top of the tank or vessel. However, some applications may call for installation at the bottom of the tank. (Fig.1) The probe must be installed in areas free of flow or turbulence. If this is not...

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Before the calibration of the unit is first tested, the process should be free of pressure or (if that is not possible) the unit should first be tested outside of the vessel. Make sure the muliti-meter is correctly connected in series with the source and the instrument. The scale should be set to 20 mA (or a scale above 20mA). First confirm that the current output is at 4mA (for LH842 units you can adjust the trimpot "zero".) Turning the trimpot clockwise increases the currente value and turning it counterclockwise decreases the value (Fig.2). After adjusting (if necessary) the 4mA...

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Sitron Technical Specifications LH842 - Ceramic llffTlcSj Application

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