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Model 7431 & Model 7437 BTU Measurement System

BTU Measurement System - 23328 Description

A system consists of a microprocessor, flowmeter, and a pair of temperature sensors.They are used to measure theindividual energy consumption in virtually any liquid heating/cooling system such as apartment complexes, office buildings, and condominiums.The systems allow allocation of charges to individual consumers.The microprocessor provides a readout of BTU, volume, high, low, and differential temperature, hours of operation, flow rate, battery life, service parameters and many more.The unit contains two temperature and one flow input, and one control output.A user-friendly menu system makes programming simple when changes are required.A 10-year memory backs up all program settings in case of a power failure.The unit can be factory programmed for your application. Use with Niagara’s Nutating Disc, Oscillating Piston, or Turbine flowmeters.

T ec hnical Inf ormation

Functional Specifications

Power Supply12 to 24 VDC1 phase 50/60 Hz 115 VAC +10% - 15% 1 phase 50 Hz 230 VAC +10% - 15%Temperature32° F to 122° F (0° C to 50° C) operating - 40° F to 158° F (- 40° C to 70° C) storage Display Digits8 Flow Input Contact closure Control Output Model 7431 Qty2 TypeCurrent sinking (contact closure or npn transistor to ground) Figure 1. Model 7431BTUCalculator Rating10 mA @ 40 VDC maximum ResponseDuration of 0.5 seconds Control Output Model 7437 Qty3 TypeReed Switch - Form A (SPST) Dry Contact Resistive500 mA max, not to exceed 50 VAC or 75 VDC RTD SensorsType:500 Platinum(optional)3 or 7 inch lengths2 wire Model 7431;4 wire Model 7437

Physical Specifications

DisplayLCD Wall MountNEMA 4X enclosure Wiring14 AWG maximum WeightModel 7431:0.9 lbs Model 7437:2.0 lbs

Or dering Inf ormation

Model 7431-1 or Model 7437-1/115 VAC Model 7431-2 or Model 7437-2/230 VAC Model 7431-3 or Model 7437-3/12-24 VDCTo allow programming:1._____ pulse per _____ gallon 2.State if the application is heating or cooling 3.Time Zone 4.Engineering Units (BTU or KW) 5.Flowmeter location-supply or return line 1
(864) 574-3327 (800) 778-9251 Fax:(864) 574.8063 www.venturemeas.com/niagara niagarasales@venturemeas.com