Application: Rivers, Lakes, Shoal Measuring Range: 50 meters Process Connection: Gantry frame/locking flange from DN65/2.5" Temperature: -40℃ ~ 80℃ Process Pressure: -0.1~0.3 MPa Precision: ± 2mm Frequency Range: 120GHz Protection Grade: IP68 Power Supply: (12 - 24V) DC  / Four-wire The Signal output: RS485 Debugging: Bluetooth / Modbus protocol The Scene Display: NO Shell: Plastic PVDF

1. RD-FMF12-T 80G Water Level Transmitter
Content
1. Product principle........................................................1
2. Characteristic...........................................................1
3. Introduction..............................................................2
4. Installation.................................................3
5. Connection...................................................4
6. Commissioning.....................................................6
7. Structural dimensions.........................................7
8. Instrument linearity.........................................8
9. Technical parameters..............................................8

2. 1
RD-FMF12-T 80G Water Level Transmitter
1. Principle：
The general principle of the FM continuous wave radar level gauge is that the radar
emits electromagnetic waves on the top of the tank, and the electromagnetic waves are
received by the radar after being reflected by the medium. The frequency difference δf
between the received signal and the transmitted signal is proportional to the distance R
from the surface of the medium: R=C (speed)*δf (frequency difference)/2/K
(frequency modulation slope). Because the speed of light C and the frequency
modulation slope K are known, the frequency difference δf can be estimated to obtain
the distance R from the radar installation position to the material surface, and then
through the known total height of the tank, subtract the spatial distance from the radar
to the material surface (referred to as Empty height) to get the height of the material
level.
2. 80G Water Level Transmitter Characteristic
 Small beam angle, concentrated energy, stronger anti-interference ability, higher measurement
accuracy
 Small size, light weight, easy to install

3. 2
 Protection class up to IP68, suitable for a variety of water level measurement applications
 Measuring range up to 50 meters, covering large reservoirs and other water level measurement
 Multiple output circuit interfaces to work with acquisition systems
3.RD-FMF12-T Introduction
Application: Rivers, Lakes, Shoal
Measuring Range: 50 meters
Process Connection: Gantry frame/locking
flange from DN65/2.5"
Temperature: -40℃ ~ 80℃
Process Pressure: -0.1~0.3 MPa
Precision: ± 2mm
Frequency Range: 120GHz
Protection Grade: IP68
Power Supply: (12 - 24V) DC / Four-wire
The Signal output: RS485
Debugging: Bluetooth / Modbus protocol
The Scene Display: NO
Shell: Plastic PVDF

4. 3
4. RD-FMF12-T Installation requirements
 Preparation before installation
Please note the following to ensure that the instrument can be properly installed.
Please allow enough space for installation.
Avoid installations with strong vibrations.
 Illustration and installation location
Radar water level meter installation diagram（①）
Radar water level meter installation diagram（②）

5. 4
Radar water level meter installation diagram（③）
Note: When the radar antenna transmits microwave, there are certain launch angle. From the lower
edge of the antenna to the surface of the measured medium, and the area radiated by the emitted
microwave beam must not have obstacles. Therefore, the installation should be as far as possible to
avoid obstruction facilities, if necessary, "false echo learning". When installing the instrument, also
pay attention to: the highest liquid level shall not enter the measurement blind area.
5. RD-FMF12-T Electrical connection
 Power supply
Modbus-RS485 The power supply and Modbus signal lines are separated by a
shielded cable.
 Split wiring diagram

6. 5

 Security Guidance
 Please observe the requirements of the local electrical installation regulations!
 Please observe the requirements of the local regulations for the health and safety of personnel.
 All handling of the electrical components of the instrument must be done by properly trained
professionals.
 Please check the instrument nameplate to ensure that the product specifications meet your
requirements.
 Make sure that the supply voltage is the same as the instrument's nameplate
 Protection level
This instrument fully meets the requirements of protection level IP68, please make sure the cable
sealing head is waterproof. As shown below.

7. 6
How to ensure that the installation meets the requirements of IP68.
 Please make sure that the sealing head is not damaged.
 Please ensure that the cable is not damaged.
 Make sure that the cable used meets the requirements of the electrical connection specification.
 Before entering the electrical connection, bend the cable downward to ensure that water does
not flow into the housing.
 Please tighten the cable sealing head.
 Plug unused electrical connections with blind plugs
6. RD-FMF12-T Instrument commissioning
 There are two methods of commissioning the radar water level transmitter：
(1) Mobile phone Bluetooth debugging
(2) Upper computer debugging / debugging via MUDBUS protocol
 Upper computer debugging
 Connected to the host computer via RS485 converter
① RS232 interface / or USB interface
② Radar water level transmitter
③ RS485 converter

8. 7
7. RD-FMF12-TStructural dimensions （Unit：mm）
If the radar water level meter with split display
instrument (whether it is necessary to match the split
display instrument depends on the actual working
conditions), the size of the split meter head is
Gantry frame size（Unit：mm）

9. 8
8.RD-FMF12-T Instrument Linearity
Beam diameter as a function of antenna type and measurement distance：
Transmitting angle depends on antenna size
-￠42mm 5°
Accuracy See the chart below
9.RD-FMF12-T Technical parameters
Housing/Material PVDF
Sealing between housing and housing cover Silicone Rubber
Power
Four lines (12～24) V DC / Modbus-RS485
Allowable Ripple - <100Hz Uss<lV
- (100～100K) Hz Uss<l0mV
Cable parameters
Air plugs/ Pre-positioned cables 4 cores

10. 9
Output parameters
Output Signal Modbus-RS485
Communication protocols Modbus
Resolution 1mm
Fault Signals Both space height/water level height
0
Points time (0～99)s，Adjustable
Blind spot 0.1meter
Maximum measuring distance 40meters
Microwave frequency 80GHz
Measurement interval Approx. 1 second(depending on parameter
settings)
Adjustment time Approx. 1 second (depending on parameter settings)
Display Resolution 1mm
Working storage and transport temperature (-40～80) ℃
Process temperature (temperature of the antenna section） (-40～80)℃
Pressure Atmospheric pressure
Vibration resistant Vibration frequency(10～150)Hz，
Maximum vibration acceleration l0m/s²