Calibration

Step Six

The LVCN-90 is factory calibrated with a fixed measurement span of 6 feet. The 4 mA position is located 72" from the transducer face. The 20 mA position is located 3.6 inches from the transducer face. Refer to the current to distance and distance to current conversion charts in step seven for reading the current output.

1.Connect a multimeter in series to read the current output.

2.Verify that as the distance from the liquid to the LVCN-90 increases, the current signal decreases.

3.Verify that as the distance from the liquid to the LVCN-90 decreases, the current signal increases.

Power		5		Power		20
Supply	4	5	6	Supply	19	20	21
	4		6		19		21
			mA				mA
	com		(+)		com		(+)

3.6"

20 mA

72"

4 mA

LED Indication

The LVCN-90 features a single LED indicator which is used for power and fail-safe indication. During normal operation, the LED will be ON continuously to indicate that the transmitter has power and a strong echo signal return strength. Should the LED begin to FLASH, it indicates that the transmitter has no signal return strength and the device has gone into a fail-safe condition. During the fail-safe condition, the current will increase up to 22 mA and hold until the acoustic signal is reacquired. Once reacquired, the LED will turn back ON continuously and the current will indicate the appropriate mea- sured value.

	POWER
	LED
(-)	(+)
GND	12-36 VDC
4-20 mA

CALIBRATION

Step Seven

Current to Distance Conversion Chart (Nominal)

Current	Distance	Current	Distance	Current	Distance
mA	inches	mA	inches	mA	inches

2 0	0 3 . 6	1 4	2 9 . 2	0 8	5 4 . 9
1 9	0 7 . 9	1 3	3 3 . 5	0 7	5 9 . 2
1 8	1 2 . 1	1 2	3 7 . 8	0 6	6 3 . 5
1 7	1 6 . 4	11	4 2 . 1	0 5	6 7 . 7
1 6	2 0 . 7	1 0	4 6 . 3	0 4	7 2 . 0
1 5	2 5 . 0	0 9	5 0 . 6

Distance to Current Conversion Chart (Nominal)

Distance	Current		Distance		Current		Distance	Current
inches	mA			inches		mA	inches	mA

3 . 6	2 0 . 0	3 0			1 3 . 8		6 0	0 6 . 8
0 6	1 9 . 4	3 6			1 2 . 4		6 6	0 5 . 4
1 2	1 8 . 0	4 2			11 . 0		7 2	0 4 . 0
1 8	1 6 . 6	4 8			0 9 . 6
2 4	1 5 . 2	5 4			0 8 . 2

3.6"

20 mA

72"

68.4"

4 mA

LVU-90 specifications

Omega Engineering has long been a leader in providing innovative solutions for temperature and process measurement, and one of its standout products is the LVU-90 Liquid Level Transmitter. This device is designed to offer reliable and accurate liquid level measurement in a variety of industrial applications. The LVU-90 leverages advanced technologies to ensure precision while maintaining versatility across different environments.

One of the main features of the LVU-90 is its non-contact measurement capability. This characteristic allows the transmitter to determine liquid levels without needing to make physical contact with the liquid itself. This is particularly advantageous in applications involving corrosive or hazardous materials, where traditional contact measurement methods may pose risks or lead to deterioration over time. The non-contact design also reduces maintenance requirements, ultimately increasing operational efficiency.

Another notable feature of the LVU-90 is its ability to operate in a wide temperature range. The device is designed to function in both extreme heat and cold, providing versatility for various industrial settings. This robust temperature tolerance ensures that the LVU-90 can be employed in diverse applications, from water and wastewater management to chemical processing and agriculture.

The LVU-90 utilizes advanced ultrasonic technology for its measurement process. By emitting ultrasonic waves from the transmitter, it measures the time taken for the waves to travel to the surface of the liquid and back, allowing for highly accurate level readings. The utilization of this technology minimizes the influence of factors such as temperature or pressure variations, resulting in dependable performance under differing operational conditions.

Additionally, the LVU-90 is equipped with a user-friendly interface that simplifies setup and provides clear diagnostic information. Its integration capabilities allow for seamless connectivity with existing control systems, enabling real-time monitoring and enhancing overall process management.

The LVU-90 also features a durable construction, designed to withstand harsh environments. This robustness ensures longevity and reduces replacement frequency, offering significant cost savings over time. With its combination of cutting-edge technology, ease of use, and resilience, the Omega Engineering LVU-90 Liquid Level Transmitter emerges as a superior choice for industries seeking reliable liquid level measurement solutions.