Product Overview

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Our Multi‑Jet Dry Dial Water Meter with External Adjustment is engineered for high‑precision measurement of potable water across residential, commercial, and industrial settings – available in both cold water and hot water versions. The multi‑jet principle guarantees steady accuracy throughout the entire flow spectrum, while the hermetically isolated dry dial stays crystal‑clear and fog‑free for decades.

Key differentiators:

External Adjustment: Calibration can be refined on‑site without opening the housing or compromising the factory seal – saving time and preserving legal integrity.

Dry Dial Design: Magnetic drive decouples the register from water, eliminating condensation and ensuring permanent readability.

Versatile Material Selection: Available in Nylon/Plastic, Cast Iron, Stainless Steel, or Brass – choose the best fit for your environment and temperature requirements.

Key Features

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Feature	Benefit
Multi‑Jet Technology	Tangential inlet ports distribute flow evenly around the impeller, delivering consistent accuracy across all flow rates.
External Calibration	Fine‑tune meter accuracy from the outside using a simple tool – no disassembly, no broken seals, no service interruption.
Dry Dial Register	Magnetically driven counter stays completely dry; no mist, no dampness, always legible.
Anti‑Magnetic Shield	Integrated protection prevents tampering via external magnetic fields.
Integrated Strainer	Stainless steel mesh at the inlet captures debris, safeguarding internal components.
Exceptional Low‑Flow Sensitivity	Detects minute leakages – starting flow as low as 4 L/h for DN15.
Ready for Remote Reading	Pre‑configured for reed switch or Hall sensor installation (optional).
Multiple Body Materials	Nylon/Plastic (light, corrosion‑proof), Cast Iron (rugged, economical), Stainless Steel (hygienic, premium), or Brass (aesthetic, durable).

External Adjustment Explained – The Clear Advantage

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1. What Does "Externally Adjustable" Mean?

An externally adjustable meter incorporates a mechanism on the register that allows authorized personnel to tweak the meter's accuracy using a dedicated tool without ever opening the main housing or disturbing the tamper‑evident seal. This feature is built into the design and remains accessible from the outside throughout the meter's life.

2. Why Choose an Externally Adjustable Model Over a Fixed‑Calibration Meter?

Criterion	Externally Adjustable Meter	Standard (Non‑Adjustable) Meter
Calibration Flexibility	Can be corrected on‑site instantly, without removal	No field correction possible; must be replaced if out of tolerance
Seal Integrity	Factory seal stays untouched during adjustment	Any adjustment forces seal breakage, voiding warranty and legal approval
Lifecycle Cost	Lower – quick field tune‑up avoids costly bench calibration	Higher – removal, shop calibration, and reinstallation add up
Service Downtime	Minutes – adjustment performed while meter stays in line	Days – meter out of service for transport and lab work
Regulatory Compliance	Remains fully legal – seal intact, no unauthorized access	Adjustments not permitted without re‑verification, often leading to replacement
Best Application	Ideal for district metering, bulk supply, industrial monitoring	Suitable for residential where long‑term stability is expected and access is limited

3. The Practical Benefits

On‑Site Precision: Bring a drifting meter back to spec immediately – no need to pull it from the pipeline.

Cost Efficiency: Eliminate shipping expenses, laboratory fees, and the labour of reinstallation.

Unbroken Legal Chain: The original calibration seal remains intact, so the meter stays certified.

Future‑Ready: Adapt to changing flow patterns or network demands by recalibrating as needed.

Minimize Water Loss: Maintain peak accuracy throughout the meter's lifespan, helping to detect even small leaks and reduce non‑revenue water.

4. How the Adjustment Works

A small precision screw or gear train is accessible on the register face. Using a calibrated adjustment tool, the technician turns the mechanism slightly – clockwise or counter‑clockwise – to speed up or slow down the register, thereby correcting any deviation from the reference flow. The adjustment range is deliberately limited to prevent misuse beyond legal boundaries.

All our externally adjustable meters are available across the full range of body materials and accuracy classes (R80 to R200).

Technical Specifications

1. General Specifications

Parameter	Value
Water Temperature	0°C – 50°C (cold water) / 0°C – 90°C (hot water)
Max. Operating Pressure	1.6 MPa (16 bar) optional
Pressure Loss	≤ 0.063 MPa at Q3
Accuracy Class	Class 2 per ISO 4064 (Upper zone: ±2%, Lower zone: ±5%)
Installation Orientation	Horizontal (dial facing upward)
Register Type	Dry dial, 8‑digit roller counter, magnetic drive
Minimum Reading	0.0001 m³
Maximum Reading	99,999 m³
Ingress Protection	IP68 (hermetically sealed register)

2. Dimensions (by Material and Connection)

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Dimensions are indicative – please specify required length (e.g., 165, 190, 260, 300 mm).

Size	Length L (mm)	Width W (mm)	Height H (mm)	Connection Options
DN15	165 / 190	85–98	104	Threaded BSP, Union, Quick Coupling
DN20	190 / 195	90–100	108	Threaded BSP, Union, Quick Coupling
DN25	225 / 260	100–110	115	Threaded BSP, Union, Quick Coupling
DN32	230 / 260	110–120	115	Threaded BSP, Union
DN40	245 / 300	120–130	153	Threaded BSP, Union
DN50	280 / 300	124–150	153	Threaded BSP, Flanged (4‑hole), Union

3. Flow Performance (Q3 and Minimum Flow Q1 by Accuracy Class)

Size	Q3 (m³/h)	Minimum Flow Q1 (L/h)				Starting Flow (L/h)
		R80	R100	R160	R200
DN15	2.5	31.25	25	15.6	12.5	≤ 14
DN20	4.0	50	40	25	20	≤ 16
DN25	6.3	78.75	63	39.4	31.5	≤ 19
DN32	10.0	125	100	62.5	50	≤ 25
DN40	16.0	200	160	100	80	≤ 56
DN50	25.0	312.5	250	156.3	125	≤ 70

*Note: Transitional flow Q2 = 1.6 × Q1 for all accuracy classes.*

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4. Material Selection Guide

Material	Ideal Application
Nylon / Engineering Plastic	Lightweight, corrosion‑free – excellent for chemical plants and cost‑sensitive projects.
Cast Iron	Robust and economical – the traditional standard for municipal networks and underground pits.
Stainless Steel (304/316)	Superior corrosion resistance, hygienic – perfect for food, beverage, and pharmaceutical industries.
Brass	Attractive and corrosion‑resistant – premium choice for residential and commercial buildings.

Note: Hot water version (up to 90°C) requires specific materials and construction – please consult our sales team.

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Typical Applications

Residential Complexes – Multi‑story apartments, gated communities, single‑family homes
Commercial Facilities – Office towers, retail centers, hotels, healthcare institutions
Industrial Sites – Manufacturing plants, cooling towers, process water monitoring
Municipal Networks – City water distribution, zone metering, bulk supply points
Agriculture – Farm irrigation systems, greenhouse water management
Underground Chambers – Direct‑burial installations (Cast Iron or Stainless Steel)
Meter Replacement Programs – Upgrading old installations with modern, externally adjustable meters
Hot Water Systems – Boilers, solar water heating, district heating (hot water version)

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Installation Instructions

Pre‑Installation Steps

Flush the line thoroughly to eliminate sand, stones, and debris.
Confirm that the meter size, pressure rating, and connection type match your system.
Inspect the meter for any transit damage before fitting.

Mounting Requirements

Flow Direction: The arrow embossed on the body must align with the actual water flow.
Positioning: Install horizontally with the dial facing upward (unless a vertical‑mount model is explicitly ordered).
Straight Pipe Sections: Ensure at least 5× pipe diameter (5D) upstream and 2D downstream (10D/5D for R160/R200 models).
Location: Avoid high points in the pipeline (air pockets) and protect from freezing (for cold water) or excessive heat (for hot water version, ensure adequate insulation if needed).

Connection Procedures

Threaded (BSP): Fit the supplied rubber gaskets inside the coupling nuts – never use thread sealant. Tighten by hand, then give a final ¼–½ turn with a wrench. Avoid over‑tightening, especially on plastic/nylon bodies.
Flanged (DN50): Place the gasket centrally between flanges, insert bolts, and tighten diagonally in a criss‑cross pattern.
Union / Quick Coupling: Push the pipe in until you hear a distinct "click" and verify the connection is secure.

Post‑Installation Checks

Gradually open the inlet valve to prevent water hammer.
Inspect all joints for leaks.
Release trapped air by opening a downstream tap.
Confirm the register rotates as water passes.
With all outlets closed, watch the low‑flow indicator to ensure no hidden leaks exist.

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Maintenance & Troubleshooting

Frequency	Recommended Action
Yearly	Visual check for leaks, external damage, or corrosion.
Every 2–3 Years	Clean the inlet strainer if water quality is suspect.
Every 5 Years	Compare reading against a reference meter for accuracy.
6–8 Years	Replace meter as per local regulations (especially for ≤DN25).

Common Issues and Remedies

Symptom	Possible Cause	Solution
No registration despite flow	Blocked strainer / jammed impeller	Clean strainer; remove obstruction.
Registration with zero flow	Hidden leak downstream / backflow	Repair leak; install check valve.
Slow registration (under‑reading)	Worn internals / partial blockage	Replace measuring mechanism; clean strainer.
Fast registration (over‑reading)	Air entrainment / pressure surges	Eliminate air; fit pressure stabiliser.
Fogged dial (dry type)	Compromised seal	Replace seal or entire register.
Leaking connections	Deteriorated gasket / loose nut	Replace gasket; re‑tighten properly.

Ordering Information & Contact Details

1. How to Place an Order

Please provide the following details:
Product: Multi‑Jet Dry Dial Water Meter with External Adjustment
Version: Cold water (≤50°C) / Hot water (≤90°C)
Size: DN15 / DN20 / DN25 / DN32 / DN40 / DN50
Accuracy Class: R80 / R100 / R160 / R200
Body Material: Nylon/Plastic / Cast Iron / Stainless Steel / Brass
Connection Type: Threaded BSP / Flanged / Union / Quick Coupling
Length (if applicable): e.g., 165 mm, 190 mm, 260 mm, 300 mm
Optional Extras: Pulse output (reed switch / Hall sensor), non‑return valve, custom branding

2. Commercial Information

Minimum Order: 10 units (standard materials)
Packaging: Individual carton + export‑ready case (custom packaging upon request)
Lead Time: 15–30 days post deposit
Payment: T/T, L/C, Western Union