The NRD-30 series radar level gauge emits extremely narrow microwave pulses. These pulses travel through space at the speed of light and upon encountering the solid being measured, a portion of the electromagnetic waves are reflected back and received by the antenna_The NRD-30 series radar level gauge utilizes a high-speed sampling chip and algorithm to accurately identify the time interval between the emitted and received electromagnetic waves. This time multiplied by the speed of electromagnetic waves and divided by 2 equals the distance from the radar antenna to the surface of the solid.
The following schematic diagram shows the meanings of various terms for instrument settings. The reference plane for measurement is: the bottom surface ofthe thread or the sealing surface ofthe flange.
A. Range setting B. Low limit adjustment C. High limit adjustment D. Blind zone range
Note: When using aradar level gauge, it is essential to ensure that the highest material level does not enter the measurementblind zone.
With a small beam angle, concentrated energy, and stronger anti-interference ability, it improves themeasurement accuracy and reliability.
By using external compressed air to blow and clean, the accumulation of dust on the radar antenna thatmay interfere with the measurement can be eliminated.
The measurement range can reach up to 70 meters, covering almost all silo measurements in industrialsites. With multiple output circuit interfaces, it can be compatible with acquisition systems andprovide a standard 4-20mA signal.
General data
| Exploration team materials | |
| Bell mouth / Antenna | Stainless steel 316L/PTFE |
| Sealed | Viton fluororubber, Kalrez fluororubber |
| Process connection | Stainless Steel 316L |
| shell | Aluminum, plastic, stainless steel 316L Die-cast aluminum, powder coating |
| The sealing between the shells | Silicone rubber |
| Shell window | Polycarbonate |
| Ground terminal | Stainless Steel 316L |
Technical parameters
| Blind spot | Antenna tip |
| Maximum measurement distance | 6908 is 30 meters. 6909 is 70 meters. |
| Microwave frequency | 26GHz |
| Measurement interval | About 1 second (depending on the parameter settings) |
| Adjust the time | About 1 second (depending on the parameter settings) |
| Display resolution | 1mm |
| Working storage and transportation temperature | (-40 to 100) °C |
| Process temperature (temperature of the antenna part) | (-40 to 100) °C |
| Pressure | atmospheric pressure or 1 standard atmosphere pressure |
| earthquake-resistant | Mechanical vibration: 10 m/s², < 10 Hz |
Output parameters
| Output signal | (4 to 20) mA / RS485 |
| Resolution | 1.6 microamperes |
| Fault signal | Constant current output: 20.5 mA; 22 mA; 3.9 mA |
| Two-wire load resistance | See the figure below. |
| Four-wire load resistor | Maximum 500Ω |
| Integration time | (0 - 50) seconds, adjustable |
Supply voltage
| Two-wire system (standard type) | Hz, (16 to 36) V DC |
| Intrinsically safe type | (21.6 - 26.4) V DC |
| Power consumption (two-wire system) | Maximum: 22.5 mA |
| Allowable ripple | - Less than 100 Hz: Uss < 1V (100 to 100,000) Hz: Uss < 10mV |
| Four-wire system (Intrinsically Safe + Flameproof) | (22.8 - 26.4) V DC, (198 - 242) V AC |
| Power consumption (four-wire system) | Maximum: 1 VA, 1 W |
Cable parameters
| Cable entry / plug | One blind plug, M20×1.5 1 M20×1.5 cable entry (for cable diameter 5 - 9 mm) |
| Spring terminal block | For wire cross-sections of 2.5 mm² |
Launch angle and accuracy
3041: The launch angle depends on the size of the antenna.
The transmitting angles of the antennas with diameters of 76mm, 96mm and 121mm are 12°, 8° and 6° respectively. The accuracy is shown in the following figure.
3042: The launch angle depends on the size of the antenna.
The transmitting angle of the antenna with a diameter of 196mm is 4°; the transmitting angle of the antenna with a diameter of 242mm is 4°. The accuracy is shown in the following figure.
3043: The launch angle depends on the size of the antenna.
The antenna with a diameter of 96mm has a transmission angle of 8°. The antenna with a diameter of 121mm has a transmission angle of 6°. The precision is shown in the following figure.
| NRD-3041 Radar Level Transmitter | NRD-3042 Radar Level Transmitter | NRD-3043 Radar Level Transmitter | |
 |  |  | |
| Application | Solid materials, strong dust, easy crystallization and condensation situations | ||
| Measurement range | 50 meters | 70 meters | 15 meters |
| Process connection | Universal flange | Universal flange | G1"1/2 thread |
| Medium temperature | -40~250℃ | ||
| Process pressure | -0.1~0.1MPa | ||
| Precision | ±10mm | ||
| Protection grade | IP67 | ||
| Frequency range | 26GHz | ||
| Explosion-proof grade | Ex ia ⅡC T6 Ga/Ex db ⅡC T6 Gb | ||
| Signal output | 4...20mA/HART (2-wire/4-wire)/RS485/Modbus | ||
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Contact number86-18030837175
Regional ManagerManager Zeng
Contact number86-18520508508
Regional ManagerManager Jiang
Contact number86-13324545911
Regional ManagerManager Gao
Contact number86-13871508295
Regional ManagerManager Yuan
Contact number86-13711120640
