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.
Trusted by energy & industrial leaders
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.
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 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.
Sensors
Dual PT1000 RTD + External Flow
A matched PT1000 RTD pair measures supply and return water temperatures. Flow rate comes from an external flow meter over Modbus RS485 — choose the flow meter and pipe technology to suit the loop.
Output
EN 1434 Thermal Energy
Thermal energy calculated using IAPWS-IF97 water properties — accurate across the full chilled-water and hot-water service range. Logged, trended, and exposed over Modbus RTU/TCP.
Q = ṁ · cₚ · (Tsupply − Treturn)
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
| Parameter | Specification |
|---|---|
| Accuracy Class | EN 1434 Class 2 |
| Temperature Sensors | Dual PT1000 RTD (matched pair) |
| Temperature Range | 0 °C to +180 °C (typical chilled & hot water service) |
| Flow Input | External flow meter via Modbus RS485 |
| Compatible Flow Meter Types | Ultrasonic flow meter |
| Thermal Calculation | IAPWS-IF97 water property tables (density + Cp temperature-corrected) |
| KPIs Logged | Thermal kWh, instantaneous kW, ΔT, flow rate, supply/return temperature |
| Tariff / TOU | Up to 8 tariff zones with TOU/TOD |
Communication
| Parameter | Specification |
|---|---|
| Internet | WiFi and Ethernet built-in |
| Wired / Local | RS485 (Master or Slave) |
| Protocols | Modbus RTU/TCP |
| BMS Integration | Direct Modbus, or via Energy Intelligence Platform |
Mechanical
| Parameter | Specification |
|---|---|
| Mounting | DIN rail |
| Dimensions | 94 × 89 × 69 mm |
| Operating Temperature | −25 °C to +70 °C |
| Auxiliary Power | Universal 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.
| Capability | Titan BTU | Imported Panel-Mount BTU Meter | RTD Pair + Spreadsheet | No Thermal Meter (Status Quo) |
|---|---|---|---|---|
| Form factor | DIN rail — fits inside electrical panel | Panel-mount + civil enclosure | n/a | n/a |
| EN 1434 accuracy class | Class 2 — design target | Class 2 / 3 | Not certified | None |
| BMS connectivity | WiFi + Ethernet + RS485 | RS485, sometimes Ethernet | None | None |
| Tenant sub-billing defensible | Yes | Yes | No — disputed at audit | No |
| Install effort | Hours — retrofit on DIN rail | Days — civil work needed | Hours | n/a |
| Real-time dashboard | Yes — Energy Intelligence Platform | Optional add-on | No | No |
| IAPWS-IF97 water properties | Yes — temperature-corrected | Yes | Manual approximation | n/a |
| Hot-water + chilled-water | Both — same hardware | Both | Both | n/a |
| District-cooling SCADA fit | Native Modbus RTU/TCP | Modbus, often legacy | None | None |
| Indicative price per point | ₹17k – ₹36k | ₹60k – ₹90k+ | Free, but unreliable | Zero capex / unmeasurable opex |
| Lead time | Built in India | Imported, 8–12 weeks | n/a | n/a |
Standards & Compliance
EN 1434 Class 2 thermal accuracy plus the Indian compliance frameworks for chilled-water sub-metering.
| Parameter | Specification |
|---|---|
| EN 1434 | Heat meters — full series compliance, Class 2 accuracy |
| IEC 61010 | Safety requirements for measurement equipment |
| IEC 61000 | Electromagnetic compatibility (EMC) for industrial environment |
| ECBC 2017 | Energy Conservation Building Code — chilled-water sub-metering |
| ISHRAE | Indian Society of HVAC Engineers reference design alignment |
| BEE PAT | Performance Achieve & Trade — supports thermal energy reporting |
| BIS Marking | In progress |
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.
The Titan Family — One Platform, Eight Applications
The same accuracy, connectivity, and design language across the full metering range.
| Product | Description | Status |
|---|---|---|
| TITAN | Core smart energy meter. WiFi + Ethernet + RS485 | Active |
| TITAN AUDIT | Rapid deployment logger. Split-core CT, plug & play | Active |
| TITAN EV | EV charge controller. OCPP 2.0.1, IEC 61851 | Active |
| TITAN PQ | Power quality meter. Harmonics, sags, swells, flicker, transients | Coming Soon |
| TITAN ASSET | Condition monitoring. Energy + vibration + temperature | Coming Soon |
| TITAN PLUS BTU | Chiller efficiency meter. kW/TR + BTU on a single device | Coming Soon |
| TITAN BTUYou are here | BTU meter. Chilled water, hot water, district cooling | Coming Soon |
| TITAN COMPLIANCE | Fire pump monitoring. NFPA 25 + IS 15301 compliance | Coming Soon |
Ready to specify Titan BTU for your next project?
Talk to an engineer about deployment for chilled-water sub-billing, district cooling, or hot-water plant metering.