WD13

The MWS-ST/SR type microwave sensor is a level switch consisting of a transmitter (MWS-ST) and a receiver (MWS-SR) installed face-to-face.
The transmitter emits a continuous, low power microwave beam towards the receiver and an output relay is released when the beam is obstructed.
The sensor has wide application across all areas of industry where highly reliable,non-contact level detection is required. The sensor is generally used for process control by monitoring presence/absence of product, flow/no flow conditions and point level detection in chutes, bins and silos. The sensor may also be used as a proximity switch for detection of vehicles such as dump trucks and rail cars.

Harsh environments may result in a buildup of contaminants on the sensing head; however, the sensor is easily able to penetrate such buildup thanks to the high penetrability of microwaves.

Generally speaking, microwaves cannot penetrate metals and are reflected; water absorbs the most microwaves.

State-of-the-art   Heterodyne

Detection Method

   Four channels are available, selectable by rotary switch. This permits the use

of multiple sets in close proximity to each other.

 Enclosure rating IP65/NEMA4 equivalent

The MWS-ST/SR level switch is the first of its kind to utilize the heterodyne detection method rather than the,now obsolete. diode detection method.

The heterodyne detection method gives detection output that is proportional to the received power level (linear function), whereas the diode detection method gives detection output that is proportional to the square of the received power level

(quadratic function).

Therefore the heterodyne method allows detection with aminimum received power that is lower than that of the minimum level required by the diode detection method. This greatly increases the operating range/penetrability without any increase in the power of the transmitted microwave radiation.

Function of Switches,

Indicators and Rheostats

Selecting the channel

 Single channel mode (CHO)
   In the case where multiple units are NOT installed in close proximity and a faster response time is desirable, the CHANNEL selector on both the transmitter ② and receiver ⑦ should be set to 0. Selecting CH0 will disable the multi channel function.
 Multi channel mode (CH1~8)
   In the case where multiple sets of sensors are installed in close proximity to each other, multi channel mode should be used. The sensor comes standard with four channels (CH1~8). The CHANNEL selector on both the transmitter② and its
   corresponding receiver ⑦ must be set to the same channel.

Each pair of transmitters and receivers should be set to a different channel; if more than 4 channels are required consult WADECO or its representative.

 Set the CHANNEL selector on both the transmitter and receiver to 0 (single channel mode) if you are installing one transmitter/receiver set only: if you are installing more than one transmitter/receiver set,in close proximity, then select channel 1，2, 3 or 4 (multi channel mode) to prevent set-to-set

interference.

 Apply power to the unit. The green POWER indicator will illuminate.

   BEAM OBSTRUCTED states.

BEAM UNOBSTRUCTED

 For an application where material is introduced from above, a
   suitable delay time must be provided to avoid instantaneous
   detection of falling material.
 When adjusting the delay time, use the BLOCK button on the
transmitter to simulate the beam being blocked.
 To use UNBLOCK output mode, switch the mode selection switch to UNBLOCK.

Specifications

Installation

Install the transmitter and receiver face to face as shown below.

Both unit's cable entry should face in the same direction, or be 180℃ opposite each other.