Model 5202M Remote Type BTU Calculating Unit

• Combination Heat/Cool Systems
• Heating Only Systems
• Cooling Only Systems
• Solar Systems
• Geothermal Systems
• Efficiency Measuring Verification
• Heat Reclaimers

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IMPORTANT – Verify maximum system temperature and pressure as well as flow rate and pipe size before selecting flow meter. Flow Meter must be equipped with pulse output for connection to BTU (Energy) Meter. See the PDF versions of 1700 Series Engineering Manual or 1800 Series Engineering Manual for details.

COMPONENT DESCRIPTION

All ISTEC BTU (Energy) Meter Systems consists of the following components... Electronic Calculating Unit (Model 5202M) – Solid-state circuitry for accurate and reliable operation with automatic compensation for water density. Non-resettable LCD indicates flow, temperatures and BTU's. Temperature Sensors – Platinum RTDs for fast response and high accuracy. Sensors are available in lengths of 1-1/2", 3-1/2" and 5-3/4". Sensor Wells – Wells are available in three sizes: 1-1/2",4" and 6". Flow Meter – Industrial grade multi-wing turbine type with pulse output. Sizes up to 1-1/2" have union connections, 2" and larger have ANSI standard 150# flanges. Stop Valves – The flow meter should always be installed with a stop valve on each side for easier servicing.

TECHNICAL SPECIFICATIONS Temperature Range: 23°F to 356°F (5°C to 180°C) ΔT Range: 0.225°F to 333°F (0.125K to 185K) Ambient Conditions: 14°F to 158°F (-10°C to 70°C) LCD: 7-Digit Sensors: Platinum RTD Power Supply: Battery or 24V AC Output: Open Collector or Dry Contact Dimensions: L – 5.04" (128mm) L1 – 5.63" (143mm) H – 3.35" (85.1mm) D – 0.14" (3.5mm)

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.

POWER SOURCE

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.

SENSORS

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

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.

OUTPUT

The Electronic Calculating Unit shall provide an open collector or dry contact pulse output proportional to the heating energy count.

FLOW METER

(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).