BTU METERING SYSTEM SPECIFICATION: MODEL 5202
AS MANUFACTURED BY ISTEC CORPORATION,
5 PARK LAKE ROAD, SPARTA, NJ 07871
The contractor shall furnish and install as shown on the plans an electronic BTU (Energy) Metering System. The system shall be designed and programmed exclusively for energy (BTU) metering. It shall be factory assembled, calibrated and tested, incorporating the following features...
ELECTRONIC CALCULATING UNIT
The Electronic Calculating Unit, Model 5202M, shall be of solid state microprocessor based construction incorporating Chip Card Technology. It shall be capable of measuring heating and/or cooling energy (BTUs). The changeover from heating to cooling energy measurement shall be performed automatically. The unit shall contain a non-resettable Liquid Crystal Display (LCD) to continually indicate the total accumulated heating BTUs. The unit shall allow the user to access the following information on the LCD: supply
temperatures, return temperatures, temperature difference, total flows, momentary energy consumption, momentary flow rates, maximum energy consumption and maximum flow rates. In addition, the LCD shall provide status and error indication, including segment test, days-of-operation as well as type of error. The Electronic Calculating Unit shall automatically compensate for fluid density. It shall contain a terminal strip for connection to the temperature sensors and flow meter.
CHIP CARD SYSTEM
The Electronic Calculating Unit shall incorporate Chip Card Technology to provide error-free transferal of data to a Chip Card. The Chip Card shall be capable of storing information from up to 50 units. A Chip Card Reader and software shall be available to transfer the data from the Chip Card into a computer for trend logging and billing purposes.
The Electronic Calculating Unit shall be powered by an integral 6-year battery. An optional 10-year battery or 24-volt, 60Hz power adapter shall be available.
Temperature sensors shall be the Platinum RTD type to provide high accuracy, stability and long term reliability. They shall be calibrated and supplied in matched pairs with a 13-foot (3.96cm) long cable. The sensor probe shall be available in lengths of; 1-1/2" (40mm), 3-1/2" (90mm) and 5-3/4" (145mm) to accommodate different pipe sizes. They shall be designed to fit tightly into immersion wells that are inserted into the water flow.
Sensor Wells shall be 1-1/2" (40mm) long x 3/8" (9.53mm) NPT for pipe sizes up to 1" (25mm) and 4" (100mm) long x 1/2" (9.53) NPT for pipe sizes 1-1/4" (32mm) to 3" (80mm). For pipe sizes 4" (100mm) and above a 6" (150mm) long x 1/2" (9.53mm) NPT well shall be available. They shall incorporate a locking screw to secure the sensor.
The Electronic Calculating Unit shall provide an open collector or
dry contact pulse output proportional to the heating energy count.
(see ISTEC 1700 Series Engineering Manual (PDF) or 1800 Series Engineering Manual (PDF) for complete data)
A separate Flow Meter shall
be utilized so various temperatures, pressures and flow rates can
be accommodated. It shall be the multi-wing turbine type, Istec
Model _________. It shall have a line size of ______ inch(s)
(________mm). The body shall be constructed of brass/cast iron.
The unit shall have a hermetically sealed mechanical counter,
which shall be non-resettable. It shall be constructed so that the
flow insert assembly and counter can be replaced without removing
the meter body. The Flow Meter shall have an accuracy of +
1.5% at_______ gpm (________ lph). It shall have a continuous
flow rating of________ gpm (________ m 3ph). The peak flow,
which the meter cannot be subjected to for more than one hour per
day, shall be______ gpm (_________ m 3ph). The Flow Meter
shall provide a "pulse" type output of 1 contact closure for every
1/10/100 gallon(s) of flow (metric counters provide 1 pulse for every
1/10/100 liter(s) of flow).