NYRD704 1.8GHz Guided Wave Radar Level Meter
The guided wave radar level meter is a level meter based on the
principle of time domain reflection (TDR). The electromagnetic
pulse of the radar level gauge propagates along the steel cable or
probe at the speed of light. Part of the pulse of the level meter
is reflected to form an echo and return to the pulse transmitter
along the same path. The distance between the transmitter and the
surface of the measured medium is proportional to the propagation
time of the pulse during that period, and the liquid level height
is calculated.
Radar Level Meter Technical Parameter
| Parameters | Frequency: 100MHZ-1.8GHZ Measuring range:-cable :0-30m; rod, coaxial :0-6m Repeatability: ± 3mm Resolution: 1mm Sampling: echo 55 samples / s Response speed: 0.2S (depending on the actual usage) Output current signal :4-20mA Accuracy: <0.1% |
| Communication Interface | HART communication protocol |
| Process connection | G1-1/2 Flange DN50, DN80, DN100, DN150 |
| Process pressure | -1 ~ 40bar |
| Power | Power: 24VDC (± 10%), ripple voltage: 1Vpp Power consumption: max 22.5mA |
| Environmental conditions | temperature -40 ℃ ~ +80 ℃ |
| Housing protection grade | IP68 |
| Explosion levels | EXiaIICT6 |
| Instrumentation power supply and signal output wire connection | Sharing a two-core shielded cable Cable entry: 2 M20 × 1.5 (the cables diameter of 5 - 9mm) |
※ Note: Products can be customized according to the specific requirements of users!
Radar Level Meter Installation requirements
Installation Guide
The following installation guide is suitable for that of cable and
rod probes for measurement of solid particles and liquid. The
coaxial tubular probe is applied only to the liquid object.
Installation position:
Try to stay away from the outlet and inlet.
The meter should not touch the tank internal wall for metal tanks
and plastic tanks. If it is a metal tank, the material level meter
should not be installed at the center of the tank.
It is proposed to install at 1/4 of the silo diameter.
Probes of cable or rod types should keep a distance away from the
tank wall not less than 30cm.
The probe bottom should be about 30mm to the tank bottom.
The probe should keep a distance not less than 200mm from the
obstacles within the tank.
The sensor can be installed at the center of the tank top, if the
bottom of the container is a cone, so the measurement can be taken
to the tank bottom.
The picture on the right shows the rod-type radar installation
diagram, mainly used for liquid level measurement.
Characteristics:
Can measure a material of which the dielectric constant is greater
than or equal to 1.4.
Generally used for measuring the material of which the viscosity is
less than or equal to 500cst and less likely to produce adhesion.
The maximum range of rod-type radar can reach 6m.
Have strong inhibiting ability to the steam and foam so the
measurement is not affected.
The double-rod measurement method can be taken for the liquid
material of which the dielectric constant is relatively small in
order to guarantee the good measurement accuracy.
The down-pulling force applied to the cable
When charging and discharging, the material will generate
down-pulling force to the cable, which is determined by the
following factors:
- cable length
- material density
- tank diameter
- cable diameter
Installation guide for liquid measurement
The installation guide below applies to rod- and cable-type probes.
The tubular probe measurement is not related with the installation
method.
Obstacles within tank
- Probe should keep a distance not less than 200mm away from the
obstacles.
Interference removal
- Interference suppression: The software could suppress the
interference echo, so as to achieve the ideal effect of
measurement.
- Bypass, wave guide pipes or tubes could be used to suppress the
interference when the viscosity is not greater than 500cst.
Liquid standard installation
Tubular probe is the best solution for the medium of which the
viscosity is less than or equal to 500cst and which is not easy to
adhesion. The features are as follows:
- Excellent reliability
- Can be used in a medium of which the dielectric constant is greater
than or equal to 1.4, and the measurement is irrelevant to the
medium conductivity.
- Obstacles within tank and the short pipe size do not affect the
measurement.
- Withstand more lateral pressure than rod-type probe
- Rod-type probe is suggested for medium of high viscosity.
