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DIN Rail BTU Meter for Chilled Water — Titan BTU

Thermal Energy Metering. EN 1434 Class 2.

DIN rail thermal energy meter for chilled-water, hot-water, and district-cooling networks. Dual PT1000 RTDs, external flow input via Modbus RS485, and IAPWS-IF97 water properties for defensible BTU measurement at tenant-billing accuracy.

A BTU meter measures the thermal energy a water loop delivers or extracts, from flow rate and the supply-to-return temperature difference. Titan BTU is a DIN-rail BTU meter for chilled-water tenant sub-billing, district cooling and hot-water networks, designed to EN 1434 Class 2 with dual PT1000 RTDs and Modbus or BACnet output. Pricing starts at ₹17,400 excluding the flow sensor.

EN 1434 Class 2AccuracyDual PT1000 RTDSensorsModbus RS485Flow InputWiFi + Ethernet + RS485Comms
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Titan BTU DIN Rail Thermal Energy Meter on DIN rail
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At a glance

What it is
A compact DIN-rail BTU (thermal energy) meter for chilled-water, hot-water, and district-cooling networks.
Best for
Tenant chilled-water sub-billing, district cooling, HVAC consultants, and BMS integrators needing per-floor or per-tenant kWh-thermal data.
Standards
EN 1434 Class 2 thermal accuracy, IAPWS-IF97 water properties, defensible audit trail for tenant billing.
Interfaces
Dual PT1000 RTDs (supply + return), external flow meter via Modbus RS485, WiFi + Ethernet for cloud + BMS.
Price & lead time
From ₹17,400 per meter, excluding the flow sensor. 4 weeks from confirmed PO.

Why Titan BTU

Three reasons HVAC consultants, district-cooling operators, ESCOs, and tenant-billing teams reach for Titan BTU.

EN 1434 Class 2 Thermal Accuracy

Defensible thermal energy measurement to the international BTU-meter standard. Dual PT1000 RTDs on supply and return, external flow meter via Modbus RS485, IAPWS-IF97 water properties for temperature-dependent density and specific heat.

DIN Rail Form Factor

Compact 94×89×69 mm DIN rail housing — fits inside the same control panel as the chiller controls or building electrical metering. Most BTU meters force a separate panel-mount enclosure with civil work.

Cloud-Ready Out of the Box

WiFi and Ethernet built in, RS-485 for legacy BMS, Modbus RTU/TCP and BACnet throughout. Stream thermal data to the Energy Intelligence Platform, your existing BMS, or any third-party tenant-billing system without an external gateway.

The Problem

Most BTU meters available in India today are bulky panel-mount devices, often imported, often requiring civil work for the calculator enclosure plus separate flow-meter installation. Locally available DIN rail thermal meters are rare and usually limited in connectivity — RS-485 only, no embedded Ethernet, no built-in BMS-friendly Modbus TCP.

Buildings that should sub-bill chilled water by tenant often skip BTU metering entirely because the install cost is disproportionate. District-cooling operators commission substation BTU meters but lose the data because the legacy communications layer never reaches the operator's SCADA.

Titan BTU is built to fit modern building electrical panels, modern BMS networks, and modern cloud platforms — without forcing a redesign of the existing chilled-water plant.

How It Works

One DIN rail device. Two RTD inputs. One flow signal. EN 1434 thermal energy at the output.

Applications

Where defensible thermal energy measurement earns its keep.

Chilled-Water Tenant Sub-Billing

Per-tenant thermal metering for malls, IT parks, hotels, and commercial buildings. Bill chilled-water consumption at the per-floor or per-tenant level. EN 1434 Class 2 accuracy provides the audit trail.

District Cooling Networks

Substation-side metering for district cooling delivered to individual buildings. Compatible with Tabreed-style SDS deployments, GIFT City, Bhendi Bazaar SRA, and Aerocity-style central plants.

Hot Water & Heating Networks

Hot-water and heating-system metering for hotels, hospitals, and large commercial kitchens. Same hardware, swap chilled-water context for hot-water context — IAPWS-IF97 covers both.

Plant Efficiency & ESG Reporting

Thermal output of chillers and boilers measured in real time. Pair with electrical metering to compute kW/TR, COP, and PUE; pair with corporate ESG reporting tools for Scope-2 disclosure.

Technical Specifications

Full datasheet — thermal measurement, communication, and mechanical.

Thermal Measurement

ParameterSpecification
Accuracy ClassEN 1434 Class 2
Temperature SensorsDual PT1000 RTD (matched pair)
Temperature Range0 °C to +180 °C (typical chilled & hot water service)
Flow InputExternal flow meter via Modbus RS485
Compatible Flow Meter TypesUltrasonic flow meter
Thermal CalculationIAPWS-IF97 water property tables (density + Cp temperature-corrected)
KPIs LoggedThermal kWh, instantaneous kW, ΔT, flow rate, supply/return temperature
Tariff / TOUUp to 8 tariff zones with TOU/TOD

Communication

ParameterSpecification
InternetWiFi and Ethernet built-in
Wired / LocalRS485 (Master or Slave) — Modbus RTU or BACnet MS/TP, selectable
ProtocolsModbus RTU/TCP, BACnet MS/TP, BACnet/IP
BMS IntegrationDirect Modbus or BACnet, or via Energy Intelligence Platform

Mechanical

ParameterSpecification
MountingDIN rail
Dimensions94 × 89 × 69 mm
Operating Temperature−25 °C to +70 °C
Auxiliary PowerUniversal wide-range AC/DC

How Titan BTU Compares

The four ways buildings handle chilled-water and district-cooling metering today — and how a DIN rail BTU meter changes the install economics.

CapabilityTitan BTUImported Panel-Mount BTU MeterRTD Pair + SpreadsheetNo Thermal Meter (Status Quo)
Form factorDIN rail — fits inside electrical panelPanel-mount + civil enclosuren/an/a
EN 1434 accuracy classClass 2 — design targetClass 2 / 3Not certifiedNone
BMS connectivityWiFi + Ethernet + RS485RS485, sometimes EthernetNoneNone
Tenant sub-billing defensibleYesYesNo — disputed at auditNo
Install effortHours — retrofit on DIN railDays — civil work neededHoursn/a
Real-time dashboardYes — Energy Intelligence PlatformOptional add-onNoNo
IAPWS-IF97 water propertiesYes — temperature-correctedYesManual approximationn/a
Hot-water + chilled-waterBoth — same hardwareBothBothn/a
District-cooling SCADA fitNative Modbus RTU/TCPModbus, often legacyNoneNone
Indicative price per point₹17k – ₹36k₹60k – ₹90k+Free, but unreliableZero capex / unmeasurable opex
Lead time4 weeks from confirmed PO (built in India)Imported, 8–12 weeksn/an/a

Standards & Compliance

EN 1434 Class 2 thermal accuracy plus the Indian compliance frameworks for chilled-water sub-metering.

ParameterSpecification
EN 1434Heat meters — Class 2 accuracy (design target)
IEC 61010Safety requirements for measurement equipment
IEC 61000Electromagnetic compatibility (EMC) for industrial environment
ECBC 2017Energy Conservation Building Code — chilled-water sub-metering
ISHRAEIndian Society of HVAC Engineers reference design alignment
BEE PATPerformance Achieve & Trade — supports thermal energy reporting

Energy Intelligence Platform

Titan BTU pairs with the Energy Intelligence Platform for fleet-wide thermal energy dashboards, per-tenant billing export, district-cooling network mapping, and ECBC reporting. Operates standalone for sites that prefer to land Modbus data directly in an existing BMS, SCADA, or third-party tenant-billing platform.

Explore the Platform →

Size Your Deployment

Two free engineering calculators that pair with Titan BTU for specifying chilled-water and district-cooling deployments:

  • →BTU Meter Sizing Guide (free download) — engineering reference for sizing thermal energy meters: flow-meter selection, RTD pairing, EN 1434 Class 2 requirements, common installation gotchas.
  • →BTU Meter Sizing Calculator — plug in your chilled-water load and ΔT, get a meter-size recommendation back instantly.
  • →Chiller COP Calculator — derive COP, kW/TR, and EER from thermal and electrical measurements. Benchmark against ECBC 2017.

Frequently Asked Questions

Common questions about BTU meters, EN 1434 compliance, flow meter pairing, and chilled-water tenant billing.

A BTU meter (heat meter / thermal energy meter) measures the thermal energy delivered or extracted by a fluid loop. For chilled water it computes thermal energy as flow × specific heat × (return − supply) × density, integrated over time. Titan BTU takes its temperature inputs from a matched PT1000 RTD pair on supply and return, its flow input from an external flow meter over Modbus RS485, and uses IAPWS-IF97 water property tables to keep the calculation accurate across the full operating temperature range.
BTU stands for British Thermal Unit and it measures thermal energy — heat — not electricity. One BTU is the energy needed to raise one pound of water by one degree Fahrenheit, which is about 1,055 joules or 1.055 kJ. In HVAC the rate matters more than the unit: one ton of refrigeration (1 TR) is 12,000 BTU per hour. A BTU meter therefore measures how much cooling or heating actually moved through a pipe, which is what you bill a tenant for or judge a chiller on.
Thermal energy is the product of flow rate, the temperature difference between supply and return, and the density and specific heat of the fluid. The familiar shortcuts are BTU/hr = GPM × 500 × ΔT(°F) for water in imperial units, or kW = m³/h × 1.163 × ΔT(°C) in metric — but both assume fixed water properties. Titan BTU does not use that approximation: it computes density and specific heat from IAPWS-IF97 water properties at the measured temperature every cycle, which is what EN 1434 Class 2 accuracy requires across a real chilled-water ΔT.
Same thermal hardware platform, EN 1434 Class 2 accuracy, dual PT1000 RTDs, same Modbus connectivity. Titan Plus BTU adds a Class 0.5S electrical metering channel on the same device — useful when you also want to measure the chiller's electrical input and compute kW/TR or COP in real time. Titan BTU is the thermal-only configuration: cheaper per measurement point if your electrical metering is handled by another device or if you only need thermal billing.
An ultrasonic flow meter that exposes flow rate over Modbus RS485. The flow meter is sized and selected for the pipe diameter and rate; Titan BTU consumes the rate and pairs it with the temperature pair to produce thermal energy.
Yes — design target is EN 1434 Class 2, the international heat-meter accuracy class. EN 1434 specifies the temperature pair matching, the flow integration, the calculator, and the reporting requirements that European tenant-billing applications and ECBC-aligned commercial buildings reference.
Yes — that is one of the primary use cases. Chilled-water billing per tenant requires defensible thermal energy measurement, which EN 1434 Class 2 delivers. Each tenant gets their own BTU meter on the chilled-water inlet to their floor or zone; the Energy Intelligence Platform aggregates consumption into monthly bills.
Yes — the thermal calculation works equally well for hot-water service. IAPWS-IF97 covers liquid water from 0 °C up through the operating range typical of building heating systems. Same hardware, same temperature-pair installation, just the supply/return roles reversed in the BMS configuration.
Yes. District cooling substations use BTU meters at every building connection to allocate cooling consumption back to the central plant. Titan BTU's DIN rail form factor fits substation control panels without extra civil work, and Modbus RTU/TCP integrates with district-cooling SCADA systems out of the box.
Tech OVN manufactures the Titan BTU thermal energy meter in India — a DIN-rail BTU meter for chilled-water HVAC, chiller plants, and district cooling, with PT1000 RTDs and Modbus/BMS output. It ships 4 weeks from confirmed PO.
A Titan BTU chilled-water meter starts at ₹17,400 (ex-flow-sensor); final price depends on pipe size and the flow meter paired with it. Because it is DIN-rail and BMS-ready, total installed cost is well below a traditional BTU meter with a separate transmitter.

The Titan Family — One Platform, Eight Applications

The same accuracy, connectivity, and design language across the full metering range.

ProductDescriptionStatus
TITANCore smart energy meter. WiFi + Ethernet + RS485Active
TITAN AUDITRapid deployment logger. Split-core CT, plug & playActive
TITAN EVEV charge controller. OCPP 2.0.1, IEC 61851Active
TITAN PQPower quality meter. Harmonics, sags, swells, flicker, transients4 weeks from PO
TITAN ASSETCondition monitoring. Energy + vibration + temperature4 weeks from PO
TITAN PLUS BTUChiller efficiency meter. kW/TR + BTU on a single device4 weeks from PO
TITAN BTUYou are hereBTU meter. Chilled water, hot water, district cooling4 weeks from PO
TITAN COMPLIANCEFire pump monitoring. NFPA 25 + IS 15301 compliance4 weeks from PO
TITAN PUMPPump controller. Dry-run protection + energy monitoring + remote start4 weeks from PO
TITAN PUMP RMSRemote pump monitoring. 4G, run hours + dry run + fault alerts4 weeks from PO
TITAN BLOWERBlower controller. Filter-clog + over-pressure protection + energy monitoring4 weeks from PO

Ready to specify Titan BTU for your next project?

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