GRLM-70 Dinel-Radar Level Meters

RADAR LEVEL METERS GRLM-70 dinel
RADAR LEVEL METERS GRLM-70 dinel

The GRLM radar level meters are compact measuring devices consisting of two main parts – a level meter (housing) and a display module (display). The electronics transmit very short electrical pulses (0.5 ns), which are linked to a one-wire transmission line (measuring electrode). Measuring electrode can be created of rod or rope.

The pulse propagates along the electrode in the form of an electromagnetic wave toward the level surface, where it is partly reflected and the reflected component is returned to the receiving module of the electronics. The electronics measure the time of flight of electromagnetic waves and the instant distance to the surface level is calculated. Then based on the height of the level, the level meter current output 4 .. 20 mA is set with the HART communications or an industrial RS-485 line with Modbus RTU communications, and the measured value is shown on the display.

Radar level meters with guided waves are suited to the continuous level measurement of various liquid, mush, and bulk-solid materials. Level meters are resistant against changes in the atmosphere (pressure, temperature, dust, steam) and to changes in medium parameters (change in dielectric constant, conductivity)

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Specification

Supply voltage GRLM–70N(T)–_ _ 18 … 36 V DC
GRLM–70Xi(T)–_ _ 18 … 30 V DC
GRLM–70Xd(T)–_ _ 18 … 33 V DC
Output GRLM–70_–_ _-_-I 4 … 20 mA with HART®
GRLM–70_–_ _-_-M route RS-485 with Modbus RTU
Current consumption  GRLM–70_–_ _-_-I 4 … 20 mA / max. 22 mA
GRLM–70_–_ _-_-M typ. 10 mA / max. 30 mA
Basic error 1) (for reference reflector) – GRLM-70_-20 in area 0,1 – 0,2 m / 0,2 – 2,0 m / 2,0 – 3,0 m ± 5 mm / ± 3 mm / ± 2 mm
– other types in area 0,1 – 0,2 m / 0,2 – 2,0 m / 2,0 – 40 m ± 10 mm / ± 4 mm / ± 2 mm
Error of current output max. 80 μA
Resolution 0,1 mm
Maximal length of measuring electrode GRLM–70_–10, 13 8 m
GRLM–70_–11 (12) 2 m
GRLM–70_–20 3 m
GRLM–70_–30 (33,34,35) 40 m
GRLM–70_–32 12 m
Dead zone   – measur. sensitivity: low, medium, user (1 – 4) 100 mm / 0 mm 3)
– measur. sensitivity: high, user (5) 150 mm / 50 mm 3)
– measur. sensitivity: user (6, 7) 200 mm / 50 mm 3)
– measur. sensitivity: user (8) 250 mm / 50 mm 3)
Adjustable measuring range (SPAN) min. 200 mm
Electrical parameters for variants Xi (XiT) – max. internal values  Ui=30 V DC; Ii=132 mA; Pi=0,99W; Ci=370 nF; Li=0,9 mH
Measurement sensitivity (8 degrees)  low (1) – medium (3) -high (5) – user (1 – 8)
Failure indication (echo loss) adjustable in modes:  3,75 mA, 4 mA, 20 mA, 22 mA, LAST 4)
Damping  1 .. 99 s
Rise time  cca 60 s
Leakage resistance electrode – housing 10 kΩ
Coupling capacity (housing – power) / dielectric strength 5 nF / 500 V AC
Maximal resistance of current output load 270 Ω / 180 Ω / 90 Ω
Rmax for voltage – 24V DC / 22V DC / 20V DC
Maximum tensile strength of the rope electrode 1400 kg
Tightening torque of cable gland GRLM–70N(NT,Xi,XiT) 3 Nm (plastic)
GRLM–70Xd(XdT) 7 Nm (steel)
Protection class IP67
Recommended cable GRLM–70_–_-_-I PVC 2 x 0,75 mm2
GRLM–70_–_-_-M PVC 2 x 2 x 0,25mm2 (twisted pair, shielded)
Weight (without electrode)  cca 0,5 kg (1 kg variant T)

Download Catalog: RADAR LEVEL METERS GRLM-70

Ref: Dienel.cz

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