ONICON System-30 MODBUS BTU - Manual (Page 6)

11451 South Belcher Road, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]
System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345
Page 6
1.3 STANDARD FEATURES AND SPECIFICATIONS
• Single mode Btu calculations, in either the heating or cooling mode, are totalized and
reported.
• Two-pipe dual mode Btu calculations in both the heating mode and the cooling mode are
totalized and reported separately.
• Auxiliary pulse input for totalizing pulse outputs from external devices such as water or
gas meters.
GENERAL SPECIFICATIONS
CALIBRATION
Flow sensor and temperature sensors are individually
calibrated, followed by a complete system calibration.
Field commissioning is also available.
ACCURACY
Differential temperature accuracy ±0.15° F over
calibrated
range
Computing non-linearity within ±0.05%
Flow sensor accuracy:
±0.5% OF READING at calibrated velocity
±1% OF READING from 3 to 30 ft/s (10:1 range)
±2% OF READING from 0.4 to 20 ft/s (50:1 range)
TEMPERATURE SENSORS
Solid state sensors are custom calibrated using N.I.S.T.
traceable temperature standards.
PROGRAMMING
Factory programmed for each specific application
MEMORY
Nonvolatile EEPROM memory retains all program
parameters and totalized values in the event of power
loss.
OUTPUT SIGNALS
Isolated solid state dry contacts for mode 1 and mode
2 energy total
Contact rating: 100 mA, 50VDC maximum
Contact duration: 0.5, 1, 2 or 6 sec selectable
NETWORK INTERFACE
MODBUS RTU Protocol
RS485, 2-wire (half duplex)
MODBUS REGISTERS
Total Energy (Btu, ton-hr(s), kw-hr)
Energy Rate (Btu/hr, tons, kw)
Total Flow (gallons, liters, cubic meters)
Flow Rate (gpm, l/s, l/m, m
3 /hr)
Supply Temperature (°F, °C)
Return Temperature (°F, °C)
Mode (Heating-Cooling) Indicator
Aux Total (Count)
BAUD RATE
1200, 2400, 4800, 9600, 19200, 38400, 57600 &
115200 bps
INPUT SIGNALS
One isolated auxiliary pulse input for totalization
(Factory configurable for active pulse, open collector
sinking, open collector sourcing or dry contact pulses)
3 – 24V dc
50Hz maximum frequency
10msec minimum pulse duration
OPTIONAL LOCAL DISPLAY
Alphanumeric backlit LCD displays total energy, total,
flow, energy rate, flow rate, supply temperature and return
temperature
Alpha: 16 characters, 0.2” high
Numeric: 6 digit, 0.4” high
MAINTENANCE
ONICON recommends periodic inspection and recalibration.
No other periodic maintenance is required.
TEMPERATURE RANGE
Liquid temperature range: 32° to 200°F
Ambient temperature range: 40° to 120°F
MECHANICAL
OVERALL DIMENSION:
9.25” L x 5” W x 6.5” H
TEMPERATURE THERMOWELL:
Brass thermowell (½” sweat or ¼” NPT)
ELECTRICAL
This equipment is intended for INSTALLATION
CATEGORY (OVERVOLTAGE CATEGORY) II
applications
INPUT VOLTAGE: 24 V ±10% AC 50/60 Hz or
24 V ±4 DC
INPUT CURRENT: 200 mA maximum
TERMINALS CONNECTIONS: Use 18-22 ga. Copper wire. Do
not exceed 4.5 in-lb (0.5 Nm) of torque when tightening.
WIRING:
CONDUIT: Use PVC jacketed copper cable with a wire Gauge
suitable for the length of run and required maximum current
carrying capacity. The installation must comply with all
local, state and federal codes.
PLENUM AREA: (without conduit) Use plenum rated
copper cable with a wire gauge suitable for the length of
run and required maximum current carrying capacity. The
installation must comply with all local, state and federal
building codes.
Note: Specifications are subject to change without notice.