CS-EM BTU/Energy Monitor — Available Spring 2012
Energy Monitoring of Heating or Cooling Systems, 3/4” to 10” Pipe
DESCRIPTION
The CS-EM is an economical energy flow monitor intended for applications in energy transfer and heating/cooling systems where energy use requires measurement.
In heat exchange loops the CS-EM internally calculates the energy gained or lost by the heat exchanger. The energy is calculated based on the the mass volume of liquid passing through the system and the difference in temperature between the supply and return lines. The volume of liquid is measured by means of a pulse generating Clark ultrasonic flow transmitter. An RTD sensor built into the flowmeter (T1) measures temperature at the meter and the remote temperature (T2) is measured by means of a precision RTD sensor mounted in the return pipe.
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 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 CS-EM is water. Other media consisting of water and a certain percentage of glycol up to 30% can be field configured.
APPLICATIONS
- HEATING ONLY APPLICATION
- COOLING ONLY APPLICATION
- HEAT RECOVERY APPLICATIONS
- CONDENSATE RECOVERY APPLICATIONS
- EFFICIENCY MEASURING/VERIFICATION
- SOLAR AND GEOTHERMAL SYSTEMS
SPECIFICATIONS
TEMPERATURE MEASUREMENT
RTD integral to Flow Transmitter:
Sensor: 100 Ohm Platinum RTD Element ( Alpha= 0.00385)
Accuracy: ±0.06% at 0°C
Remote RTD Assembly: Clark Spring-Loaded RTD Thermowell Assemblies with General Purpose
Aluminum Connection Heads are designed for use with, and supplied with, Clark 316 SS thermowells.
This design allows 1/4" spring compression to ensure positive contact with the bottom of the thermowell.
Sensor: 100 Ohm Platinum RTD Element ( Alpha= 0.00385)
Accuracy: ±0.06% at 0°C
Sheath material & Diameter: 316 SS, 1/4" dia.
Element Connection: 3 wire, screw terminal
Connection to Energy Monitor: 10 ft connecting RTD cable supplied with each model.
Cable installed at monitor end via water tight strain relief fitting and electrical connector.
Head Mounting Fittings: 316 SS, 1/2" x 1/2" NPT hex nipple, 1" length
Head & Sheath Termination: Aluminum screw cover head, 3/4" NPT conduit connection
Sizes: See model & dimension chart
THERMOWELL
Material: 316L SS Pipe Conection: 3/4" NPT Dimensions: See Table 1 below
Table 1
| Remote RTD Model & Thermowell Dimension Chart | ||||
| Model | For Pipe Sizes | See Figure | S | U |
| 19-027 | 3/4", 1", 1-1/2", & 2" | 1 | - | - |
| 19-028 | 3" & 4" | 2 | 4" | 2-1/2" |
| 19-029 | 6" & 8" | 2 | 6" | 4-1/2" |
| 19-030 | 10" | 2 | 9" | 7-1/2" |
FLOW TRANSMITTER WITH RTD SENSOR & INTEGRATED ELECTRONICS FOR ENERGY CALCULATIONS
DESCRIPTION
Clark Sonic ultrasonic flow transmitters are ideal for measurement of flow rates of acoustically conductive liquids including most clean liquids and many liquids with entrained solids. They are ideal for monitoring flow rate and temperature in heat exchange applications. When used in energy measurement applications the transmitters are typically supplied with a built-in platinum 100 Ohm RTD temperature sensor to monitor the process temperature.
Main advantages include excellent long term stability, no pressure drop, broad fluid compatibility, high accuracy and low cost. Also, there are no moving parts.
At the heart of the transmitter is a proprietary mixed signal ASIC which allows sophisticated timing, control and transducer drive circuitry to be combined on a single integrated circuit
The ASIC uses a special algorithm that is an improvement upon the standard single-path measurement technique. Using the “sing around” method, the ultrasonic transducer alternates between transmitting and receiving to measure differences in flight time between upstream and downstream transmissions. A sound pulse is transmitted from an upstream transducer towards a downstream transducer like a traditional time-of-flight measurement. However, the received sound pulse then triggers a second downstream transmission, that then triggers a third and so on for a specific number of cycles. This process is repeated in the upstream direction.
Because it takes an average flight time over multiple cycles to compute the difference in flight times, the approach yields a significant improvement in timing accuracy when compared with the time-of -flight difference of a single sound pulse in each direction. This algorithm, combined with the pico-second timing resolution of the ASIC, provides the precise time measurement capability necessary for compact, small diameter ultrasonic meters.
The output of the transmitter is unaffected by changes in fluid temperature, density and viscosity as the flow calculation is independent of the speed of sound.
SPECIFICATIONS
GENERAL
Flow Range: Bi-directional, per "Standard Models" table Accuracy: ±0.75% of full scale Operating Temperature: -40 to 190°F (-40 to 87.8°C) Response Time: User Selectable, 2 or 10 seconds Viscosity Range: 0.2 to 150 cSt (0.2 to 150 mPas) Liquid Density: 30.6 to 74.9 lb/cu.ft. (490 to 1200 kg/m3) Max. Working Pressure: ¾" to 2":250 PSI (17.2 bars) 3" to 10": Per ASME 150 flange specification Pipe Sizes: 3/4", 1", 1 1/2", 2", 3", 4", 6", 8", 10" Pipe Connections: See Model Tables 2 & 3 Sizes 3/4" to 2"- Female NPT, BSP Size 3" to 10": ASME 150 Flange Electrical Enclosure: Integral to Body casting with gasketed cover; One 1/2" NPT conduit connection and one M16 x 1.5 connection (used for remote RTD) Enclosure Rating: NEMA 4 (IP 65) Power Supply Voltage: 18 to 36 VDC
WETTED MATERIALS
Ultrasonic Transducers: ULTEM® Encapsulated Seals: EPDM, Buna-N, Neoprene™, FKM, or other Body Material: ¾" to 2":Brass (UNS C83600) 3" to 8": Schedule 40, epoxy coated, carbon steel pipe
OUTPUT
Pulse Output: Can be factory set or field configured to report volume flow rate, mass flow rate or energy total. Output is an optically isolated NPN transistor with maximum sinking capability to 50 mA from a voltage source of no more than 48 VDC or a voltage output (power supply voltage). Pulse duration is 2 ms when reporting flow rate and 10 ms when reporting energy total (consult factory for different pulse duration).
Wiring Connection:
10 ft shielded 3-conductor plenum cable for RS-485 10 ft shielded 4-conductor plenum cable for power & pulse output Liquidtight 1/2" non-metallic conduit connector supplied for RS-485 & Power & Pulse cable
Table 2
| STANDARD MODELS- ¾" TO 2" | |||||||
| Model | Pipe Size/Thread Size | Full Scale Ranges (GPM) | Full Scale Ranges (LPM) | ||||
| Min. | Max. | Pulses/gallon | Min. | Max. | Pulses/liter | ||
| CS-EMB34 | 3/4" NPT or BSP | 0.38 | 25 | 1200 | 1.50 | 100 | 360 |
| CS-EMB10 | 1.0" NPT or BSP | 0.75 | 50 | 600 | 3.00 | 200 | 160 |
| CS-EMB15 | 1.50" NPT or BSP | 1.20 | 80 | 375 | 4.50 | 300 | 85 |
| CS-EMB20 | 2.0" NPT or BSP | 1.80 | 120 | 200 | 6.8 | 455 | 50 |
Table 3
| STANDARD MODELS- 3" TO 10" | |||||||
| Model | Pipe Size | Full Scale Ranges (GPM) | Full Scale Ranges (LPM) | ||||
| Min. | Max. | Pulses/gallon | Min. | Max. | Pulses/liter | ||
| CS-EMC3 | 3" | 6 | 400 | 75 | 23 | 1500 | 20 |
| CS-EMC4 | 4" | 7.5 | 500 | 60 | 29 | 1900 | 16 |
| CS-EMC6 | 6" | 18 | 1200 | 25 | 68 | 4500 | 7 |
| CS-EMC8 | 8" | 30 | 2000 | 15 | 114 | 7600 | 4 |
| CS-EMC10 | 10" | 45 | 3000 | 10 | 165 | 11000 | 3 |
FIELD REPLACEABLE TRANSDUCER FOR 3" TO 10" SIZES
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Two opposing CS-EMC ultrasonic transducers are inserted into fixed ULTEM® drywells and held in place with light spring force. A locating keyway in the drywell aids insertion and positioning of the transducers. In the event of field failure of a transducer, replacement is straightforward and can be accomplished without removing the pipe spool and shutting down the process. The electrical PC board can also be field replaced. Calibration factor and other specific information are maintained at the factory for all transmitters shipped. |
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Energy Measurement:
T1 RTD is located in the flow sensor T2 Remote RTD is installed in a return pipe. Heating and cooling energy are both measured and totaled in separate registers in model CS-EM. The values can be interrogated via the Modbus Master. 1) Heating Mode: T1>T2 2) Cooling Mode: T2>T1 The energy total pulse output functions in the absolute mode, indifferent as to whether in the heating or cooling mode.
Modbus Operability:
Baud Rate: 9600 (default) or 19.2 KB/S Parity: Selectable, None (default), Even, Odd Slave ID: 01-255 (default is 01) Function Codes: 03, 05 & 06 are supported Exception Codes: 01, 02 & 03 are supported Data types: Word, Double Data is sent "Big Endian", i.e. most significant byte first. Flow and energy data updated every 2 seconds. Turn around time is less than 2 seconds. Since the data is updated every 2 seconds, reading data at intervals greater than the update time will ensure that current values will always be fresh.
Commissioning:
The CS-EM requires no special software to set the desired communication parameters. It can be done at the factory or from the user's Modbus Master over the RS-485 network. Standalone commissioning can be done via PC serial port (model 485SD9TB, RS-485 converter required). Download commissioning software HERE.
Table 4
| Read Data Registers | |||||
| Variable | Register Number | # Registers | Function Code | Data Type | Description |
| FLOW RATE | 40001 | 2 | 03 | Double | RETURNS FLOW RATE IN SELECTED UNITS |
| ENERGY RATE | 40003 | 2 | 03 | Double | RETURNS ENERGY RATE IN SELECTED UNITS |
| MASS RATE | 40005 | 2 | 03 | Double | RETURNS MASS FLOW RATE IN SELECTED UNITS |
| FLOW TOTAL | 40007 | 2 | 03 | Double | RETURNS TOTAL FLOW IN SELECTED UNITS SINCE LAST RESET |
| HEATING TOTAL | 40009 | 2 | 03 | Double | RETURNS TOTAL HEAT ENERGY IN SELECTED UNITS SINCE LAST RESET |
| COOLING TOTAL | 40011 | 2 | 03 | Double | RETURNS TOTAL COOLING ENERGY IN SELECTED UNITS SINCE LAST RESET |
| MASS TOTAL | 40013 | 2 | 03 | Double | RETURNS TOTAL MASS IN SELECTED UNITS SINCE LAST RESET |
| LOCAL TEMP | 40015 | 2 | 03 | Double | RETURNS LOCAL TEMPERATURE IN SELECTED UNITS |
| REMOTE TEMP | 40017 | 2 | 03 | Double | RETURNS REMOTE TEMPERATURE IN SELECTED UNITS |
Table 5
| Setup Functions, Write Data Registers | |||||
| Variable | Register Number | # Registers | Function Code | Data Type | Description |
| SET FLOW RATE UNITS | 40101 | 1 | 06 | WORD | UNITS OF FLOW RATE; 0 = G/M, 1 = L/M, 2 = L/SEC |
| SET ENERGY RATE UNITS | 40102 | 1 | 06 | WORD | UNITS OF ENERGY RATE; 3 = BTU/M, 4 = KBTU/M, 5 = KBTU/HR, 6 = KW |
| SET MASS FLOW RATE UNITS | 40103 | 1 | 06 | WORD | UNITS OF MASS RATE; 7 = LBS/MIN, 8 = KG/MIN |
| SET FLOW TOTAL UNITS | 40104 | 1 | 06 | WORD | FLOW TOTAL UNITS; 9 = GALS, 10 = LITERS, 11 = CUBIC METERS |
| SET ENERGY TOTAL UNITS | 40105 | 1 | 06 | WORD | ENERGY TOTAL UNITS; 12 = kBTU, 13 =W-HRS, 14 = KW-HRS |
| SET MASS TOTAL UNITS | 40106 | 1 | 06 | WORD | MASS UNITS; 15 = LBS, 16 = KG |
| SELECT PULSE OUTPUT | 40107 | 1 | 06 | WORD | SELECT ENERGY,FLOW,OR MASS AS PULSE OUTPUT; 0 = FLOW, 1 = ENERGY, 2 = MASS |
| SELECT TEMPERATURE UNITS | 40108 | 1 | 06 | WORD | SELECT DEG F OR DEG C; 0 = DEG F, 1 = DEG C |
| SET % ETHYLENE GLYCOL | 40109 | 1 | 06 | WORD | ENTER VALUE 0-30 |
| SET % PROPYLENE GLYCOL | 40110 | 1 | 06 | WORD | ENTER VALUE 0-30 |
Table 6
| Commissioning & Other Functions, Write Data Registers | |||||
| Function | Register Number | # Registers | Function Code | Data Type | Description |
| *SET SLAVE ID | 40201 | 1 | 06 | WORD | 01 IS FACTORY SET, 0 to 255 |
| *BAUDRATE | 40202 | 1 | 06 | WORD | 19.2 KB 0R 9600 (DEFAULT) 0 = 9600, 1 = 19.2kb |
| *SET PARITY | 40203 | 1 | 06 | WORD | NONE, ODD, EVEN (DEFAULT) 0,1,2 |
| RESET FLOW TOTAL | 00001 | 1 | 05 | WORD | CLEARS TOTALIZED FLOW |
| RESET HEATING ENERGY TOTAL | 00002 | 1 | 05 | WORD | CLEARS TOTALIZED HEATING ENERGY |
| RESET COOLING ENERGY TOTAL | 00003 | 1 | 05 | WORD | CLEARS TOTALIZED COOLING ENERGY |
| RESET MASS TOTAL | 00004 | 1 | 05 | WORD | CLEARS TOTALIZED MASS |
| SET DEFAULT UNITS | 00005 | 1 | 05 | WORD | RESET ALL UNITS TO FACTORY DEFAULTS |
| *Can only be set when commissioning | |||||
Commissioning from a personal computer is straightforward with Clark commissioning software. Download here.
Table 7
| Dimensions - Pipe Sizes 3/4" to 2" | ||||||||||
| Size/ Connection | A | B | C | D | E | |||||
| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | |
| 3/4" & 1" | 9.20 | 234 | 1.62 | 41.10 | 2.06 | 52.30 | 6.40 | 163 | 2.40 | 61.00 |
| 1-1/2" & 2" | 9.88 | 251 | 2.75 | 69.90 | 2.51 | 63.80 | 6.40 | 163 | 2.40 | 61.00 |
Table 8
| Dimensions - Pipe Sizes 3" to 10" | ||||||||
| Pipe Size | Dimensions (Inches) | Number of Holes | ||||||
| A | B | C | D | E | F | Bolt Circle Diameter | ||
| 3" | 11.00 | 7.50 | 3.50 | 6.54 | 2.62 | 0.75 | 6.00 | 4 |
| 4" | 13.00 | 9.00 | 4.00 | 6.54 | 2.62 | 0.75 | 7.50 | 8 |
| 6" | 16.00 | 11.00 | 5.09 | 6.54 | 2.62 | 0.88 | 9.50 | 8 |
| 8" | 18.00 | 13.50 | 6.11 | 6.54 | 2.62 | 0.88 | 11.75 | 8 |
| 10" | 22.00 | 16.00 | 7.18 | 6.54 | 2.62 | 1.00 | 14.25 | 12 |
ELECTRICAL
RS-485: 3-conductor cable Red: TXD1 Black: TXDO Green or Clear: GND Power & Pulse Out: 4-conductor cable Red (+): Vin 12 to 30 VDC Black (-): Vin Return Green : OPTO NPN E White: OPTO NPN C |
Note: NPN Opto-isolated switch output (order code I) and Vo Powered Pulse Output (order code V) are jumper selected at the factory. |
Optional Model 43-119, RS-485 Converter
for Commissioning from a PC:
PC End: DB9 Female
RS-485 End: Terminal Block
Terminal Block Connections to DN-EM:
Black: TD(A)-
Red: TD(B)+
Clear or Green: Gnd (Green)ORDERING INFORMATION
Model CS-EM is supplied with a default setup configuration. The setup can be changed in the field (see CS-EM installation manual) or configured at the factory according to customer requirements. If you require the factory to provide a non-default configuration, please DOWNLOAD a Factory Configuration Sheet (PDF file) To order a factory default configuration:
1) SELECT REMOTE TEMPERATURE SENSOR FROM TABLE 1
2) SELECT FLOW/ENERGY MONITOR FROM TABLES 2 OR 3
Table 9
3/4" TO 3" ENERGY METER ORDERING INFORMATION
ORDER NUMBER: ABCD
EXAMPLE: CS-EM10-19-027NE1
| A=Flow Transmitter Model w/Remote Temp Probe | B=Pipe Thread | C=Transducer Seal | D | ||
| 1= Default Configuration #1 | 2= Default Configuration #2 | 3= Default Configuration #3 | |||
| CS-EMB34-19-027 | N= Female NPT | E= EPDM | Pulse Output: 1 pulse = 1000 Btu (1 KBtu) | Pulse Output: 1 pulse = 1 KW-Hr | User Specified: User must download, fill out and submit the Factory Configuration Sheet. |
| CS-EMB10-19-027 | B=Female British Standard Pipe (G) | B= Buna-N | Media: Water, no glycol | Media: Water, no glycol | |
| CS-EMB15-19-027 | N= Neoprene® | Volume Flow Rate Units: Gallons/Min | Volume Flow Rate Units: Liters/Min | ||
| CS-EMB20-19-027 | V= FKM | Mass Flow Rate Units: Lbs/Min | Mass Flow Rate Units: KG/Min | ||
| Volume Total Units: Gallons | Volume Total Units: Liters | ||||
| Mass Total Units: Lbs | Mass Total Units: KG | ||||
| Energy Rate Units: kBtu/Min | Energy Rate Units: KW | ||||
| Energy Total Units: kBtu | Energy Total Units: KW-Hrs | ||||
| Temperature Units: oF | Temperature Units: oC | ||||
| Baud Rate: 9600 | Baud Rate: 9600 | ||||
| Parity: None | Parity: None | ||||
| Slave ID: 01 | Slave ID: 01 | ||||
| See Table 1 for Temperature Probe detail. | |||||
| See Table 2 for Flow Transmitter Model detail. | |||||
Table 10
3" TO 10" ENERGY METER ORDERING INFORMATION
ORDER NUMBER: ACD
EXAMPLE: CS-EMC4-19-028E2
| A= Flow Transmitter Model w/Remote Temp Probe | C= Transducer Seal | D | ||
| 1= Default Configuration #1 | 2= Default Configuration #2 | 3= Default Configuration #3 | ||
| CS-EMC3-19-028 | E= EPDM | Pulse Output: 1 pulse = 1000 Btu (1 KBtu) | Pulse Output: 1 pulse = 1 KW-Hr | User Specified: User must download, fill out and submit the Factory Configuration Sheet. |
| CS-EMC4-19-028 | B= Buna-N | Media: Water, no glycol | Media: Water, no glycol | |
| CS-EMC6-19-029 | N= Neoprene® | Volume Flow Rate Units: Gallons/Min | Volume Flow Rate Units: Liters/Min | |
| CS-EMC8-19-029 | V= FKM | Mass Flow Rate Units: Lbs/Min | Mass Flow Rate Units: KG/Min | |
| CS-EMC10-19-030 | Volume Total Units: Gallons | Volume Total Units: Liters | ||
| Mass Total Units: Lbs | Mass Total Units: KG | |||
| Energy Rate Units: kBtu/Min | Energy Rate Units: KW | |||
| Energy Total Units: kBtu | Energy Total Units: KW-Hrs | |||
| Temperature Units: °F | Temperature Units: °C | |||
| Baud Rate: 9600 | Baud Rate: 9600 | |||
| Parity: None | Parity: None | |||
| Slave ID: 01 | Slave ID: 01 | |||
| See Table 1 for Temperature Probe Detail. | ||||
| See Table 3 for Flow Transmitter Model detail. | ||||
ULTEM® is a registered trademark of The General Electric Company.
Neoprene® is a registered trademark of DuPont Dow.
Table 11
ACCESSORIES ORDERING INFORMATION
| Accessory | Description |
| RT-3-502 | RTD cable, 1 ft, three conductor , 22 gauge stranded tinned, PVC insulation, red, red, white; outer insulation color white, temp rating 221°F |
| 43-119 | RS-485 Converter for Commissioning from a PC |
