Point Guard L

The measurement system Point-GuardL is a microwave barrier and consist of a transmitter and a receiver unit. It is used for level monitoring or level detection of bulk material e.g. in silos, pipelines, chutes, containers, feeding- / receiving vessels and hoppers.

Reliable level detection
Contactless measurement
Minimum / maximum detection

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Product Information

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Use

SolidFlow 2.0 is a sensor especially developed for measuring the flow rate of solids conveyed in metallic ducts.

It has successfully been tested for online-measuring of:

all types of dust, powder and granulates
grain size between 1 nm and 1 cm
pneumatically conveyed materials or
in free fall after mechanical conveying systems
SolidFlow is wear-resistant and the commissioning is very easy.

Function

The SolidFlow 2.0-sensor uses the latest microwave technology.
The sensor is used exclusively in metal piping.

The measuring field is generated through the special coupling of the microwave together with the metal pipe.
The microwave coupled into the pipe is reflected by the solid particles and received by the sensor.

The received signals are evaluated with regard to their frequency and amplitude.

The sensor virtually works like a particle counter that counts streaming particles per time unit.

The frequency-selective analysis ensures that only streaming particles are measured.
The SolidFlow 2.0 has a active roping compensation. Based on latest microprocessor-technology, the measuring signal is being dismantled in its frequency spectrum, which enables the sensor to compensate influences of roping.
The calibration of the sensor takes place in the installed state, simply by pushing a button and entering the reference quantity.

Mounting and Installation

For the assembly of the sensor, the installation location is specified in accordance with the conveyed inlet and outlet paths.

In case of pipe diameters over 200 mm, 2 or 3 sensors per measuring point are used, with the sensors arranged at 90° or 120° to each other.

In free-fall applications (e. g. after conveyor screws or rotary conveyors), an inlet path (fall height) of at least 300 mm is ideal. Shorter inlet paths are possible by agreement.

The sensor bracket (welding socket) is welded on at the specified installation location. After this, a 20 mm-borehole is drilled through the sensor bracket and through the pipe wall.

The sensor is then adjusted to the wall thickness, inserted and fixed with the help of the coupling nut. Done!

Commissioning:

The commissioning of the measuring device takes place via the FME analysis electronics.

These electronics offer a convenient, menu-driven input of parameters such as measuring range, desired physical units or measuring signal attenuation.

The available outputs are a current output, 4…20 mA as well as a pulse output (open collector). The menu language options are German, English or French.

Technical Data

Sensor	Housing	Stainless steel 1.4571
	Protection category	IP 65, DustEx 20 or GasEx (option)
	Operating temperature	Front end of sensor: – 20 … + 80 °C [-4 … +176 °F]Optional: – 20 … + 200 °C [-4 … +392 °F]Sensor electronic: 0 … 60 °C [+32 … +140 °F]
	Max. working pressure	1 bar, optional 10 bar
	Working frequency	K-Band 24,125 GHz (± 100 MHz)
	Transmitting power	Max. 5 mW
	Weight	1.3 kg
	Dimension	Ø 60, Ø 20, L 271 mm
	Accuracy	± 2… 5 % in calibrated range

Transmitter	Power supply	110/230 V, 50 Hz (optional 24 V DC)
	Power consumption	20 W / 24 VA
	Current consumption	Max. 1 A at 24 V
	Protection category	IP 65 according to EN 60 529/10.91
	Operating temperature	-10 … + 45 °C [+14 … +113 °F]
	Enclosure dimensions	258 x 237 x 174 (W x H x D)
	Weight	Approx. 2.5 kg
	Interface	RS 485 / RS 232 C (ModBus)
	Cable glands	3 x M16 (4.5 – 10 mm Ø)
	Screw terminals	0.2 – 2.5 mm² [AWG 24 – 14]
	Current output signal	4… 20 mA (0… 20 mA), load < 500 Ω
	Measurement value alarm relay output	Relay with switching contact, max. 250 V AC, 1 A
	Data storage	Flash
	Pulse output	Open Collector – Max. 30 V, 20 mA

C-Box	Size	98 x 64 x 35 mm (W x H x D)