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Product catalog summary

Overview: The document provides technical specifications and functionalities of the ML 311 Heat Meter, a device used for measuring thermal energy in various applications such as commercial, domestic, and facilities like city heating and refrigeration.

Specifications:

Housing: PPO housing, sealable with protection rate IP40/IP54.
Display: 4 lines × 15 characters, backlit, with an optional blue version.
Languages: Supports 6 programmable languages (Italian, English, Spanish, French, German, Portuguese).
Special Functions: Includes bi-directional, dual range, diagnostic, energy saving, heat/cold switch, and reset input.
Inputs/Outputs: Programmable pulse/frequency outputs and digital/analog inputs for flow rate and pulse measurements.
Data Logger: 12-month data logging capability for heating/cooling consumption.
Communication: Supports RS232, RS485, MODBUS, BACnet MS/TP, M-bus, N2Open.
Power Supply: 90-265 Vac or 18-63Vdc/15-45Vac.
Accuracy: ±0.2% with repeatability better than 0.1%.

Measurement Methodology:

Thermal energy is calculated using the formula E=V*K*Δt, where V is the volume of the thermal carrier fluid, K is the specific calorific coefficient, and Δt is the temperature difference between inflow and return flow.
Direct measuring methodology requires flow measurement directly from the thermal carrier fluid using flow meters, energy calculators, and paired temperature sensors.

Flow Meters:

Various types of flow meters are detailed, including Woltmann, ultrasonic, and electromagnetic flow meters, each with specific connection types, lengths, and flow rate limits.
Technical specifications include nominal diameter, size, maximum peak flow, continuous flow, transitional flow, and minimum flow.

Environmental and Approval Standards:

Operating ambient temperature is between +5 °C and +55 °C.
Mechanical environment class M1 and electromagnetic environment class E1.
Approvals include paired calibration at EN1434-MI004.

Temperature Sensors:

Sensor types include Pt500, with options for Pt100 and Pt1000.
Measurement limits and temperature ranges are specified for different sensor types (PLT and PLH).
Connection cable types and lengths are detailed, with specific resistance values for signal leads.

Catalog excerpts

ENERGY CALCULATOR MANAGING ENERGY

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HVAC&R - Building automation Thermal energy is determined by a calculation which derives from the application of the following physical relation: E=V*K*At Where: V = Volume of the thermal carrierfluid (to be measured) K = Specific calorific coefficient of the thermal carrier fluid called Enthalpy (in relation to the internal thermal fluid in use, see PTB tables) At = Thermal carrier fluid temperature difference between IN-FLOW and RETURN-FLOW (to be measured) Applications Commercial (offices, industrial, building automation) Domestic (residential houses, condominium) HEATING/COOLING METER: Direct...

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TECHNICAL SPECIFICATIONS FLOW METERS Wafer or insertion probe sensors available. 0,2% accuracy on request. ELECTROMAGNETIC FLOW METERS - C C-M marked CAN ALSO BE COMBINED TO ANY OTHER FLOW METER WITH PULSE OR ANALOG OUTPUT

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Wire connection Sensor type PLT 2 wire max 5 mt 4 wire max 10 mt - with head PLH: until 30 mt Pt500 (Pt 100 & Pt 1000 on request) Temperature difference, which is measured by temperature sensors pair and which is directly related to the quantity of thermal energy, calculated by the calculator, where are connected. PLT: brass until DN150, max stem length: 225 mm PN16 PLH: SSteel >l DN150, max stem length: 225 mm PN40 COMPANY WITH QUALITY SYSTEM CERTIFIED BY DNV GL = ISO 9001 = Production & Warehouse 35044 Montagnana (PD) Italy Via Piemonte, 1 20092 CiniseMo Balsamo (MI) Italy Viale Matteotti,...

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Catalog excerpts

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