ONICON System-40 BTU Measurement


Description

System-40 Series BTU Meters mampu memberikan pengukuran yang akurat terhadap  thermal energy pada material air and air/glycol yang terdapat pada sistem pemanas maupun pendingin air. Each meter includes an integral inline flow sensor and a pair of precision matched temperature sensors. The compact design also features an easy to operate user interface and is available in several different configurations.

Aplication

Monitoring chilled water, hot water and condenser water in AHU and CRAC units for:

• Commercial office tenant billing

• Residential apartment and condominium

tenant billing

Monitoring renewable energy resources for:

• Solar thermal applications

• Ground source heat pumps

• Geothermal heating systems

Features

Reliable No-Moving-Parts Design – 

Wetted transducers measure the ultrasonic signal transit time differential, which correlates

directly to the flow rate. The direct beam path orientation significantly enhances signal

strength and long term reliability.

Highly Accurate Over a Wide Flow Range –

The flow sensor is accurate to within ±1% of reading over the normal (25:1 turndown)

operating range and within ±2% of reading over an extended (100:1 turndown) range.

User Friendly Backlit Display – 

The bright, easy-to-read, backlit display uses “smart button technology” to simplify page

navigation and programming. This eliminates the need for special configuration tools.

Matched Platinum 1000Ω RTD Temperature Sensors – 

Sensors are paired in a matching process that ensure a differential measurement

uncertainty of better than ±0.18°F.

Suitable for Water and Water/Glycol Solutions –

System-40 is field programmable for both water and water/glycol solutions to ensure accurate flow and energy measurement.

Detachable Display – 

The display for the system-40 is easily detached from the flow sensor. This allows for remote mount installation up to 5ft from the sensor body. 

Built-in Interval Data Logger – 

Energy and volume totals are date/time stamped and logged within the meter along with other analytical data. This data is available via BACnet®.

ACCURACY

±1% of reading over 25:1 turndown

±2% of reading over 100 :1 turndown

Overall turndown exceeds 500 :1

Repeatability: ≤±0.2%

Meets EN1434 Class 1 accuracy requirements

TEMPERATURE SENSORS 

Field serviceable MID certified matched pair of 2-wire 1000Ω platinum RTDs

Calibrated to a differential measurement uncertainty of ±0.18°F

Meets EN1434/C900.1 accuracy requirements for 3K sensors

CALCULATOR 

Computation error: ≤ 0.09% at 30°F Δt

Meets EN1434 Class 1 requirements with 3K minimum Δt

PIPE SIZE RANGE 

½ – 2½” nominal diameter

PIPING SYSTEM CONNECTIONS 

Male NPT threads 

2½” meter provided with ANSI Class 150 raised face flanges

FLUID TEMPERATURE RANGE 

32 to 250°F

MAXIMUM OPERATING PRESSURE 

400 psi

PRESSURE DROP 

Less than 1 psi at 4 ft/s, decreasing at lower velocities

MATERIALS 

Wetted components: Lead-free brass, PEEK

Enclosure: Polycarbonate

ENVIRONMENTAL 

Meets EN1434/C900.1 Class A requirements

Operating Temperature Range: -13 to 131°F

Storage Temperature Range: -14 to 158°F

Enclosre Rating: IP65

POWER SUPPLY REQUIREMENTS 

20-28V AC/DC, 50/60 Hz, 5 VA maximum

ISOLATED ANALOG OUTPUT 

May be programmable for energy rate, flow rate, supply temperature, return

temperature or Δt

Configurable as: 4-20mA, 0-5 V or 0-10 V output

ISOLATED TOTALIZING SOLID STATE CONTACT CLOSURE PULSE OUTPUTS

May be programmed for energy, volume, alarm indication, mode indication or MODBUS coil indication

Contact ratings: 50 mA, 30 V

Contact pulse duration: 50, 100, 500 or 1000 ms

ISOLATED TOTALIZING PULSE INPUTS 

For use with sinking open collector or dry contact outputs

Input rating: 30 VDC, 10 mA maximum

Pulse duration: 50 ms minimum

NETWORK CONNECTIONS Isolated RS485 serial interface

COMMUNICATION PROTOCOLS 

BACnet® MS/TP per ASHRAE Standard 135.1: 2009

MODBUS® RTU

NETWORK CONFIGURATION & ADDRESSING

Baud Rates: 4800, 9600, 19200, 38400, 76800, or 115200

Device Address Range: 1 – 255 (1 – 247 MODBUS® RTU)

Device Instance Range: 1 – 4,194,303 (BACnet® only)

Parity: None, Even, Odd (MODBUS® RTU only)


Reference : https://www.onicon.com/products/system-40-btu-meter/

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