Clark Sonic Ultrasonic Products0 pages

www.clarksol.com m Model DIM-EM BTU/Energy Monitor clark Energy Monitoring of Heating or Cooling Systems, 114", 318", 112" & 314" Pipe DESCRIPTION The DN-EM is an economical energy flow monitor intended for applications in energy transfer and heat-ing/cooling systems where energy use requires measurement. In heat exchange loops the DN-EM internally calculates the energy gained or lost by the heat exchanger. The energy is cakulated based on the the mass volume rate and the difference in temperature between the supply and return lines. The volume of liquid is measured by means of a pulse generating vortex flow transmitter. A RTD sensor built into the flowmeter (T^ measures temperature at the meter and the remote temperature (T2) is measured by means of a precision RTD sensor mounted in a pipe tee. A scaled pulse output is provided and can be configured to report volume flow rate, mass flow rate or energy total. Modbus 485 communications provides an interface with a building automation or monitoring system. The unit contains non-volatile memory that records flow, mass flow and energy, and is updated every ten minutes. However, when flow, mass or energy totals are read, the reported values are true current values; the last stored value is added to the current accumulated value when the applicable register is read. The default medium for the DN-EM is water. Other media consisting of water and a certain percentage of glycol up to 60% can be field configured. FEATURES -COMPENSATED TEMPERATURE MEASUREMENT -ACCURATE FLOW MEASUREMENT -COMPENSATED FOR SPECIFIC HEAT OF A RANGE OF GLYCOLS Table 2- Models SPECIFICATIONS Medium: Suitable for water & water glycol based heat exchange systems and other liquids compatible with the materials of construction (consult factory). For media with viscosity greater than 2 millipascal sec onds (2 centipoise), higher flow rates are required to form vortices raising the minimum measurable flow rate value. Flow ranges: From 0.25 to 22.5 GPM, See Table 2 Temperature measurement: 3-wire,1000 Ohm RTD 1 RTD imbedded in flow sensor 1 RTD packaged in a 1/4" x 2.5" stainless steel sheath with 1/2" NPT brass adjustable compression fitting for mounting in a 1/2" or 3/4" pipe Tee; supplied connected to energy monitor with 10 ft of 3-wire RTD cable Model Pipe Size Full Scale Range (Gal/min) Full Scale Range (l/min) Flow Pulse Output Configuration (Pulses/Gallon Flow Formula (Q=Flow in GPM) Max. Pressure Drop (PSI) DNEM8 1/4" 0.25 to 4.00 0.9-15.0 7200 Q=.00833xFreq. 2.9 DNEM10 3/8" 0.50 to 8.00 1.8-32.0 3600 Q=.01667xFreq. DNEM15 1/2" 0.90 to 13.20 3.5 to 50.0 2000 Q= 0.06 x Freq. DNEM20 3/4" 1.30 to 22.50 5.0 to 85.0 1200 Q= 0.1 x Freq. Max. test pressure: 261 psi/18 bar at 104oF/40 °C Loss of pressure / cavitation: A minimum inlet pressure of 10.2 psi (0.7 bars) is required to avoid cavitation issues at maximum flow. Wetted materials: Flow sensor and bluff: ASTM- PPA, Polyphthalamide ISO-PA6T/6I, Grivory 40%GF Sensor vane: ETFE Sealing material: EPDM Flow Accuracy: Up to 50% fs: <1% fs From 50% fs: < 2% of measured value Temperature measurement accuracy: Reported supply & return temperatures are per PT1000, DIN EN 60751 Class B. Temperature differͭence used in energy calculation is product of matched pair RTD s calibrated at factory to report temperature difference to ±(0.1 + 0.002*T) Degs C. Operating Differential Temperature Range: 3oC to 91oC (5.4 to 164oF), consult factory for other. Pipe Tee is an ordering option, see Table 11 Temperature: Ambient: 5° to185oF (-15° to +85°C) In storage: -22oto 185oF (-30oto +85°C) Max. pressures and liquid temperature: See Table 1 Table 1- Maximum Operating Pressure & Temperature psi bar oF oC Duration 174 12 104 40 Lifetime 100 6.89 200 93.3 Lifetime 87 6 212 100 Lifetime 58 4 257 125 600 hours 58 4 284 140 2 hours Clark Solutions 10 Brent Drive Օ Hudson, MA 01749 Tel. 978 / 568 3400 Օ Fax 978 / 568 0060