MODEL 100 INDICATOR SUITABLE FOR USE WITH FOIL BASED STRAIN GAUGES AND SEMICONDUCTOR BASED STRAIN GAUGES (4-WIRE AND 3-WIRE).
Level control using direct support (load cells) or stress measurement (bolt on/pass through) technology, are industries preferred methods, for the following:-
- No inaccuracies caused by material profile.
- Weighing provides continuous level control.
- No performance, degradation caused by material build up on sensors. Sensor are fitted outside the tank and therefore not subject to hostile environments often found inside tanks and silos especially when being filled.
- Dust in the tank/silos atmosphere cannot blind the controller whilst filling.
- Load cells etc are passive devices which do not emit annoying sound waves, radio waves or laser light and are therefore more acceptable to production workers and maintenance staff.
The Model 100 comes with standard features that other manufacturers call options. The combination of a 20 bit Sigma Delta Analogue to Digital converter and selectable amplifier gain, enables the instrument to accommodate a wide range of input signals. These features together with the ability to accept both full - bridge and half bridge type load cells and strain gauges, make the Model 100 a truly versatile device.
- The built in functions such as zeroing, calibrating,and the programming of set points are simply accessed and performed through a built in four key, keypad.
- The Model 100 level controller is a “state of the art” device, utilising an embedded Motorola HC11 microprocessor as the main processing element.
- The microprocessor is watchdog equipped. Providing the user with “get up and go” after a program disturbance.
- The power supply is rugged and uncomplicated and fitted with line filters. For applications where the mains power is exceptionally noisy Web-Tech can optionally supply proprietary line filters.
- Augmenting the built in electronic hardness of the electronics, is the provision of an IP65 /NEMA 4X rated enclosure, made from moulded fibreglass polyester and incorporating patented quick release latches and piano style hinges.
- Moulded fibreglass polyester has outstanding chemical and temperature resistance and exhibits excellent weatherability and physical properties. Oil resistant “O” ring gasket with tongue and groove construction combine to produce a consistantly repeatable seal.
- An optically isolated, parallel analogue to digital converter provides a full 12bit output to the current source.
- The current loop output is fully isolated and internally generated. The signal can be driven into a maximum of 800 Ohms.
- A light emitting diode fitted to the main processor PCB provides visual indication of current loop failure.
- Signal dampening is to provide for noisy bins and tanks.
- A systems status relay has been provided, allowing PLC etc to poll status of the instrument
- All field programmed parameters are stored in non volatile memory, so power outs do not require the user to re program.
- The Model 100 is switch selectable 120/240VAC dual voltage operation.
- High and low relay outputs have been provided for those customers without access to a PLC.
- To negate the effects of product build up when weighing material. The Model 100 has an Autozero tracking routine.
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