The Measuring Instruments (Non-Prescribed Instruments) Regulations 2006 No. 1270

SCHEDULE 1

PART 2 INSTRUMENT SPECIFIC REQUIREMENTS

Part B Heat Meters

Definitions

24.  In this Schedule—

“θ” means the temperature of the heat-conveying liquid;

“θ_in ” means the value of θ at the inlet of the heat exchange circuit;

“θ_out ” means the value of θ at the outlet of the heat exchange circuit;

“Δ θ” means the temperature difference θ_in — θ_out with Δθ ≥ 0;

“θ_max ” means the upper limit of θ for the heat meter to function correctly within the MPEs;

“θ_min ” means the lower limit of Δθ for the heat meter to function correctly within the MPEs;

“Δθ_max ” means the upper limit of θ for the heat meter to function correctly within the MPEs;

“Δθ_min ” means the lower limit of θ for the heat meter to function correctly within the MPEs;

“q” means the flow rate of the heat conveying liquid;

“q_s” means the highest value of q that is permitted for short periods of time for the heat meter to function correctly;

“q_p” means the highest value of q that is permitted permanently for the heat meter to function correctly;

“q_i” means the lowest value of q that is permitted for the heat meter to function correctly;

“P” means the thermal power of the heat exchange;

“P_s” means the upper limit of P that is permitted for the heat meter to function correctly.