ELGWR-40

Product Description

ELGWR-40 Guided Wave Radar Level Transmitter is a high-performance instrument designed for continuous level measurement and point level detection in liquid applications. Based on Guided Wave Radar (TDR) technology, it provides accurate and stable level measurement independent of density, conductivity, temperature, pressure, vapour, or turbulence. The transmitter offers a 4–20 mA output with DC PNP switching output and HART communication for seamless integration with control systems. Its modular probe design with single rod and coaxial probe options ensures flexibility across various tank and process conditions. Housed in a rugged flameproof die-cast aluminium enclosure with IP66/IP67 protection, ELGWR-40 is built for harsh industrial environments. It is ideally suited for storage tanks, bypass chambers, and process vessels in oil & gas, chemical, water, and power plant applications.

Product Parameters

Configure the transmitter and electronics based on application, environment, and compliance requirements.

Electrical Specifications
1) Output Function	Continuos level measurement through analog output and point level detection through switching output.
2) Analog output (active)	Current output 4...20 mA the span between the lower range value (4 mA) and the upper range value (20mA) is equal to 0...100% of the contentious level measurement reading. It is recommended that the span between those two range values stays within the measuring range (M)
Total load resistance	<500Ù: HART resistor approx. 250Ù + load resistance approx. 250Ù if the current output is connected to a device with an inner resistance of approx. 250Ù, then there is no additional, external HART resistor necessary. In that case, the HART modem is connected in parallel to the current output wires
Lower range value	4.0mA (span 0%)
Upper range value	20.0mA (span 100%)
Response time	0.5s (default), 2s, 5s (selectable)
Temperature drift	<0,2mm/K change in ambient temperature
3) Switching output DC PNP (active)	NC or NO (short-circuit protected)
Load current	<200mA
Signal voltage HIGH	2V
Signal voltage LOW	0V to 1V
Response time	<100ms
4) Supply Voltage	12 to 30VDC (reverse-polarity protected)
5) Current Consumption	<70mA at 24VDC (no burden)
6) Start-up time	<6s
7) Cable terminals	screwless, cage clamp terminal block for stranded and solid wires 0.5…2mm² / AWG 22...14 the usage of cable end sleeves with insulation collar is not recommended

Measurement Specifications	Reference Condition: Dielectric Constant [er]=80, water surface, tank F1m, DN200 metal flange
Accuracy	±3mm or 0.03% of measured distance whichever is greatest
Repeatability	<2mm
Resolution	<1mm
Probe type	1) Single rod (Upto 2000mm) 2) Coaxial (Upto 2000mm) 3) Rope Type (Above 2000mm)
Probe length [L]	single rod probe: 100...3.000mm longer length on request coaxial probe: 100…6.000mm can be ordered in 1mm increments the reference point is always the sealing surface of the connection thread (see dimensional drawings)
Inactive area top [L1]	single rod probe, er=80: 50mm coaxial probe, er=80: 30mm single rod probe, er=2: 80mm coaxial probe, er=2: 50mm
Inactive areas bottom [L2]	single rod probe, er=80: 10mm coaxial probe, er=80: 10mm single rod probe, er=2: 50mm coaxial probe, er=2: 50mm
Measuring range [M]	Probe length [L] less both inactive areas at top and bottom [I1 and I2] in this range EEPL will have the specified measurement performance. It is recommended that the maximum and minimum liquid levels to be measured in the tank are actually within the measuring range [M] of the sensor
Switching point [S]	Freely positionable within the measuring range [M] hysteresis can be set by defining separate upper and lower thresholds; if those are set at the same position, the minimum hysteresis of 3mm applies
Dielectric constant [er]	single rod probe: >1.8 coaxial probe:>1.4
Conductivity	no restrictions
Density	no restrictions
Dynamic viscosity	single rod probe : <5.000mPa s = 5.000cP coaxial probe : <500mPa s = 500cP
Application temperature	-40°C to +150°C
Ambient temperature	operation: -25°C to +80°C storage: -40°C to +85°C
Application pressure	-1bar to 40bar
Velocity of level change	<1.000mm/s
Interface (e.g. oil on top of water)	an oil layer of <70mm thickness on top of water is not detected by the sensor; in this case the sensor will detect only the water level at a slightly lower position than actual. From an oil layer thickness >70mm onwards, the sensor detects the total level, including the oil layer, according to specifications

Mechanical Specifications
	single rod probe : 1.4404 / 316L and PEEK
Material expose to tank atmosphere	coaxial probe : 1.4404 / 316L, PEEK and o-ring seal: EPDM or FKM (Viton) other o-ring materials on request
	gasket at connection thread : Klingersil C-4400, 2mm thick
Conductivity	no restrictions
Density	no restrictions
Dynamic viscosity	single rod probe : <5.000mPa s = 5.000cP coaxial probe : <500mPa s = 500cP
Application temperature	-40°C to +150°C
Ambient temperature	operation: -25°C to +80°C storage: -40°C to +85°C
Application pressure	-1bar to 40bar
Velocity of level change	<1.000mm/s
Interface (e.g. oil on top of water)	an oil layer of <70mm thickness on top of water is not detected by the sensor; in this case the sensor will detect only the water level at a slightly lower position than actual. From an oil layer thickness >70mm onwards, the sensor detects the total level, including the oil layer, according to specifications
Material housing	CMRI Certified,Flame Proof,die Cast Aluminium Lm6, Housing
	1) without Display: 100 mm (H) X 102 mm (W)
	2) with Display: 130 mm (H) X 220 mm (W) X 190 mm (D)
Housing rating	IP-66
Cable entries /Cable gland	M20 x 1.5 Pitch (F)
Connection thread [CT]	G...A (wrench size 32mm) other connection threads on request

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Applications

Electronet instruments are widely deployed across multiple industries and utilities for reliable monitoring and control of critical process parameters.

Industry	Key Applications (ELGWR-40)
Water & Wastewater Treatment	Continuous level monitoring in chemical feed day tanks, clarifiers, flocculant storage, and narrow sumps unaffected by internal obstructions or surface turbulence.
Automation & Manufacturing	High-precision continuous level tracking in centralized hydraulic oil reservoirs, automated washing fluid vessels, and lubricant dispensing tanks.
Oil & Gas / Petrochemical	Total level and oil-water interface measurement in separator vessels, slop oil tanks, hydrocarbon storage, and condensate flash tanks.
Power & Nuclear Power Generation	Continuous monitoring in low-pressure feed heaters, deaerators, boiler feedwater tanks, boiler blowdown flash tanks, and turbine oil reservoirs.
Pulp & Paper Industry	Accurate level measurement in liquor holding tanks (black, green, white liquor), chemical recovery systems, and coating color mixing tanks.
OEM Equipment Manufacturers	Direct integration on skid-mounted boilers, high-pressure bypass vessels, modular dosing systems, and turbine auxiliary consoles.
Sugar & Distillery Industry	Continuous measurement in syrup clarifiers, molasses receiving tanks, fermentation vessels, and ethanol storage bulk tanks.

Key Features

Core capabilities and advantages of the product.

Unmatched price and performance ratio
Precise continuous level measurement and reliable point-level detection combined in one device
Fully modular probe design, i.e. the probe types are Interchangeable without any special tools or welding
Highly robust measurement due to 4-wire design and innovative signal analysis and disturbance signal suppression
Complete galvanic isolation on of device electronics from its and the tank potential inputs/outputs (no problems with electrochemical corrosion protection)