Brand: ABB

ABB Dual channel nitrate monitor AV455

Name: ABB AV455 Dual Channel Nitrate Monitor – Datasheet & Quote
Brand: ABB

Description

Overview

The ABB AV455 Dual Channel Nitrate Monitor is a reagent-free, continuous online instrument for real-time nitrate measurement in potable water treatment, borehole water analysis, and water blending applications. Unlike wet-chemistry nitrate analyzers, the AV455 measures nitrate directly by UV absorption, eliminating the ongoing reagent cost, delivery logistics, and disposal that reagent-based analyzers require – a meaningful operating-cost advantage for utilities managing multiple monitoring points across a distribution network.

Working closely with plant engineers in the region, Seven Star LLC proudly supplies the AV455 Dual Channel Nitrate Monitor to municipal water authorities and borehole water operators across the Sultanate of Oman and the wider Gulf region. Every unit is supplied on request with manufacturer documentation, regional technical support, and access to original ABB spare parts – with lead time and availability confirmed at quotation.

Measurement Principle

The AV455 uses direct UV absorption spectroscopy rather than ion-selective electrode or colorimetric reagent chemistry: nitrate absorbs strongly in the UV region, so the analyzer measures sample absorbance and derives nitrate concentration without adding any reagent to the sample stream. Dual-wavelength measurement compensates automatically for sample turbidity and dissolved organic compounds that would otherwise interfere with a single-wavelength UV reading, keeping the measurement accurate across the variable raw water quality conditions typical of borehole and surface water sources.

In practical terms this delivers a measuring range of 0 to 100 mg/l as NO₃ (0 to 20 mg/l as N), with accuracy of ±2% of reading or 0.5 mg/l (whichever is greater), and a response time of around three minutes for a 90% step change. Because there is no reagent to consume, calibrate, or replace, the AV455 requires only an annual wiper blade replacement and calibration once or twice a year, with a lamp rated for approximately ten years of continuous service – specifications that translate directly into lower total cost of ownership over the life of the instrument.

Engineering Design of the ABB AV455

The AV455 is the dual-input version of ABB’s AV450/AV455 UV nitrate monitor platform, combining two independent measurement channels into a single compact transmitter housed in a 192 × 230 × 94 mm enclosure weighing around 1 kg. This dual-channel architecture lets one transmitter monitor two separate sample points – for example, raw and treated water, or two borehole sources being blended – reducing the instrumentation footprint and cost compared to installing two single-channel monitors.

The instrument accepts a sample flow of 0.5 to 5 l/min free of air bubbles, at temperatures from 0 to 40°C and atmospheric to 3 bar pressure, with interference compensation effective up to 100 NTU turbidity and 20 mg/l dissolved organics. A dual 4.5-digit LCD display with a 16-character diagnostic line gives operators an at-a-glance reading from each channel, while two fully isolated current outputs (0–10, 0–20, or 4–20 mA) and three standard programmable relays support direct wiring into plant control and alarm systems, with HART, Profibus, and Foundation Fieldbus protocols available for SCADA integration.

Key Features

The AV455 combines reagent-free UV measurement with dual-channel efficiency, including:

Reagentless, direct UV absorption measurement of nitrate, eliminating ongoing chemical costs and disposal.
Dual-wavelength compensation for turbidity and dissolved organics, maintaining accuracy across variable raw water conditions.
True dual-channel design – two independent measurement points from a single transmitter.
Measuring range of 0 to 100 mg/l as NO₃, with response time of roughly three minutes for a 90% step change.
Lamp life of approximately ten years, with only annual wiper blade replacement as routine maintenance.
Virtually zero-maintenance operation, minimizing manual intervention and running cost.
Two fully isolated current outputs and three programmable relays for direct control system integration.
HART, Profibus, and Foundation Fieldbus communication support for SCADA and DCS connectivity.

Industrial Applications

Nitrate control is a defined regulatory parameter in potable water supply, and it is a particularly relevant concern across Oman and the GCC, where groundwater and borehole sources can carry elevated natural nitrate levels that must be diluted or treated before distribution. Municipal water authorities use the AV455 to continuously monitor nitrate at borehole wellheads and blending points, verifying in real time that blended supply water stays within regulatory limits before it reaches the distribution network – a task that reagent-based analyzers can perform but at meaningfully higher running cost given the frequency of continuous monitoring required.

With fast quotation turnaround and technical support, Seven Star LLC distributes the AV455 Dual Channel Nitrate Monitor to water authorities, agricultural water management operators, and environmental monitoring programs across Muscat, Sohar, and Salalah, as well as the wider Gulf region. The dual-channel design is particularly well suited to blending applications, where high- and low-nitrate sources are combined and both the individual source and the blended output need continuous verification from a single instrument.

Technical Specifications

Key technical specifications for the ABB AV455 Dual Channel Nitrate Monitor are summarized below.

Parameter	Specification
Model	ABB AV455 Dual Channel Nitrate Monitor
Measuring Principle	Direct UV absorption, dual-wavelength compensation (reagent-free)
Measuring Range	0 to 100 mg/l as NO₃ (0 to 20 mg/l as N)
Accuracy	±2% of reading or 0.5 mg/l, whichever is greater
Response Time	~3 minutes for 90% step change
Sample Flow	0.5 to 5 l/min, free of air bubbles
Sample Temperature	0 to 40°C
Lamp Life	~10 years continuous operation
Channels	2 independent inputs (dual-channel)
Outputs	2 isolated current outputs, 3 programmable relays
Communication	HART, Profibus, Foundation Fieldbus

Request a Quote for ABB Dual channel nitrate monitor AV455

Seven Star LLC welcomes formal RFQs for the ABB AV455 Dual Channel Nitrate Monitor from municipal water authorities, borehole water operators, and engineering consultancies across Oman and the GCC. With engineering support in Muscat, we supply on request with lead time confirmed at quotation, provide the full technical datasheet on request, and can connect your team directly with our instrumentation division for application sizing and technical support. Contact Seven Star LLC today to request a formal quotation or technical consultation for your nitrate monitoring requirements.

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About brand

ABB, formed in 1988 and headquartered in Zurich, covers an unusually long stretch of a plant's equipment list, from the flowmeter and analyzer in the field to the drive, breaker and protection relay in the electrical room.

Seven Star LLC is an independent supplier serving Oman and the GCC. Our ABB listing concentrates on measurement and analytics: ABB flowmeters, liquid analysis sensors and systems, level and pressure instruments. It also includes valve actuators, low voltage circuit breakers, ABB drives, soft starters and protection relays.

ABB product families on this page

Flow measurement includes ABB electromagnetic, Coriolis, vortex and swirl meters, sold under names such as ProcessMaster, AquaMaster, CoriolisMaster and SwirlMaster. Liquid analysis covers pH, conductivity and dissolved oxygen sensors with their transmitters. SensyTemp TSP sensors handle temperature. On the electrical side the listing has ACS355 machinery drives, the ACS550 general purpose drive, the ACQ580 for water and wastewater and the ACS880-01 industrial drive, with fieldbus adapters such as the FPBA-01 for PROFIBUS DP. Protection and switching products include SACE Tmax XT molded case breakers, SACE Emax 2 air circuit breakers, PSR soft starters and the REM615 and RET615 relays.

Where ABB instruments and drives are used

Water and wastewater plants use the electromagnetic flowmeters, analyzers and ACQ580 drives together. Oil and gas, power and chemical plants specify the Coriolis and vortex meters, pressure and level transmitters and the 615 series relays for motor and transformer feeders. The drives run pumps, fans, conveyors and compressors in almost every industry.

Ordering ABB parts: what we need

For drives send the full type code from the rating label, for example ACS355-03E-05A6-4, plus the serial number if it is a replacement. For instruments send the complete order code, measuring span, process connection, wetted materials, output or protocol and the hazardous area approval. For breakers give frame size, rated current, breaking capacity, number of poles, trip unit and fixed or withdrawable version.

Frequently Asked Questions

What does the AV455 measure and how is it different from a reagent-based nitrate analyzer?

It measures nitrate directly by UV absorption across a 0-100 mg/l as NO3 range, with no reagent added to the sample. This eliminates the ongoing reagent purchase, delivery, and disposal cost that wet-chemistry nitrate analyzers require.

How much maintenance does the AV455 need compared to a reagent-based analyzer?

Maintenance is minimal: an annual wiper blade replacement and calibration once or twice a year, with a UV lamp rated for roughly ten years of continuous service. There is no reagent to schedule, mix, or dispose of.

Can the AV455 monitor two separate sample points?

Yes. The AV455 is the true dual-channel version of ABB's UV nitrate monitor platform, with two fully independent measurement inputs in one transmitter, ideal for monitoring both a source and a blended output, or two separate boreholes.

Does the AV455 integrate with existing SCADA or DCS systems?

Yes. It provides two fully isolated current outputs, three programmable relays, and supports HART, Profibus, and Foundation Fieldbus communication protocols for direct integration with plant control systems.

Is Seven Star LLC an experienced supply partner for ABB products?

Yes. Seven Star LLC is an experienced supplier of ABB in Oman and the GCC, supplying genuine ABB instruments with full local technical support.

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