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Technologies

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Litre Meter Instruments

Electronic Instruments


Multi-function Choice

Ease-of-use is a major factor for any operator of electronics instruments. The new Litre Meter Micro LM.CD35 has been engineered to make it simple to use and programme. The unique LCD display provides information to the user at all stages. There is a large easy-to-read flow rate display in LCD characters. This is backed up by an analogue display, custom flow rate units and a large totaliser. The instrument is supplied in an IP67 rated environment resistant, fully dust-tight and water-jet protected unit. It is constructed in robust coated aluminium or stainless steel. This unit is for wall mounting in adverse process or factory environments. Both types accept a 24 VDC power supply.
The new Litre Meter batcher LM.BDC60 provides similar ease-of-use in a traditional panel mounted enclosure with large, bright LED characters and full functionality.

 

Functions

Compact, IP67 wall-mounting enclosure in epoxy coated aluminium or stainless steel.
16-point flowrate calibration is linearised for improved accuracy. Intrinsically Safe option.

Flow rate display in both analogue and digital forms, totalising and pulse and analogue outputs.


Optional outputs for Flow alarms, RS232/485, MODBUS, Profibus and Foundation Fieldbus

The Litre Meter Micro concept provides a user-friendly, multi-function instrument. The unique LCD display identifies the function in use, alarm status and the engineering units. Simple magnetically actuated controls allow sequencing of the presented display of flowrate, total, etc and programming. Linearising is included for up to sixteen flowrate calibration points selectable from the whole of the meter range. Programming is normally through the RS485 link.

Normal instrument digital displays have no identification of the units in use. This difficulty has been overcome in the Litre Meter Micro. The centre portion of the instrument between the analogue and digital display shows the flow rate units. This enables a wide range of variation. Examples of Unit programming are: flow rate l/sec, l/min, l/hr, kg/min, kg/hr, ml/sec, ml/min, m3/hr but USGPM and BBL can also be accommodated. Total is shown below the separate totalisation line in a similar fashion. Uniquely the display changes from litres to m3 when it reaches 999999 litres and m3 is identified. This feature increases the totalising capability from - 8 digit to 11-digit to avoid loss by 'rollover'.

Calibration facilities are extensive: the unit displays pulses from the flowmeter and the accurate batch time to establish an in-situ calibration value. Optional RS232/485 links allow displayed information and all operating functions to be monitored and controlled by a data acquisition system. A serial 2-wire printer output can be provided and printer interfacing can be arranged.

 

Litre Meter offer a specialist batching instrument based on 35 years of batching know-how and the old Litre Meter Micro Batcher. This new unit is designated LM.BDC60. It provides all of the traditional multi-functionality you would expect together with essential batching tools to improve accuracy, repeatablity and ease-of-use.


The range of functions offered include: Batching; Totalisation of volume flow; Flowrate - digital. Analogue outputs and pulse outputs for interfacing to data acquisition systems are standard.

16 point linearisation is provided. Data points are pre-entered at the factory, just plug in and go. There is a large 8 digit alphanumeric display complete with identification of flow/total units. And two alarm points.

These instruments have special features to maximise batching accuracy. Both the batch counting and totalising functions are linearised for changes in the normal flow rate. A batch over-run volume can be programmed to make compensation at the end of batch or batch interruption. A pre-batch function can be included to control a large and small batch valve or shut down a pump near the end of batch. A routine is included for detecting inconsistent batch valve closure. The legend 'flow' provides a warning if the batch does not correctly terminate. This legend can be coupled with an alarm output. This output provides security against a batch valve failing to close or debris halting the meter. The flow alarm function can be used to diagnose a failure of the batch to start. If a user-programmed low flow rate is not attained within a user-programmed time the instrument will provide a low alarm output. The high alarm can be used to diagnose for burst pipes etc. Remote start/stop batch inputs with confirmation open-collector outputs are standard. Re-transmission of linearised volume pulses is standard.

 

All the Litre Meter Flowmeters are calibrated on water flow using gravimetric principle rigs as recommended by the National Engineering Laboratory, East Kilbride to Litre Meter Ltd. Traceability is assured for test volume weighing, pulse counting and timing to 0.001 seconds. The normal attitude of the meter in calibration is for horizontal pipework but where requested this can be revised for a vertical installation. The difference in calibration is minimal except at very low flowrates. Special care is taken to ensure that the highest order of calibration accuracy is attained. To maintain this accuracy in usage, careful consideration must be given when designing meter installations.

LM Series Flowmeters

In most cases, these full flow Pelton wheel meters can accommodate poor installation conditions involving pipe bends etc. However, in these circumstances, in-situ calibration checking is recommended. Valves should not be connected in close proximity to the inlet connection of the flowmeter. Quite often the main pipe will be larger than the nominal 1/4" meter connections. If possible, reduction of diameter should take place not less than 100mm from the meter inlet. Expansion of the line can be connected to the standard output pipe. The meter could read high under pulsing flow conditions and the receiving instrument calibration should be adjusted accordingly.

MM Series Flowmeters

The design of the meter includes an orifice. This does not have a sharp edge, which is beneficial to the retention of the meter calibration. The normal practice associated with orifice plate installation should be adopted. A horizontal pipe run is preferred with ideally 25 pipe diameters of straight pipe upstream and 5 pipe diameters downstream. The nominal bore (pipe diameter) of these straight pipes should match the meter size. For example: A 50mm bore pipe is used for a MM50 flowmeter. If possible, avoid the installation of elbow bends, valves or reduced bore couplings in close proximity to the inlet of the flowmeter. Two or more elbow bends or loops in different planes and the presence of diaphragm valves, filters etc are particularly disruptive to the flow pattern. To maintain accuracy, all meters, including helical turbine types and the Litre Meter orifice/pelton wheel meter require a uniform velocity pattern to the flow. In cases of extreme flow turbulence, the installation of a flow straightener can be beneficial.

Flow Pulsation

Pumps which create a pulsing flow will usually cause the flowmeter to read high. The use of a volume accumulator to provide an air cushion in the system will greatly assist in reducing pulsations. In-situ recalibration of the instrument receiving the flowmeter output signal will normally restore good measurement for a pulsing flow. A separate data sheet is available giving further information on installations and the physical dimensions of the meters.