ONICON System-30 BTU - Manual (Page 6)

11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]
System-30 BTU Measurement System Manual 05/14 - 0667-2 / 18335
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.
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, 50V
Contact duration: 0.5, 1, 2 or 6 sec selectable
OPTIONAL OUTPUT SIGNALS
One isolated analog output, factory selectable for flow rate,
energy rate or delta-T
(Available as 4-20 mA, 0-10 V or 0-5 V signal)
OR
Serial connection for: BACnet MS/TP, MODBUS RTU,
JCI N2 - Metasys, Siemens P1 - Apogee, or
LONWORKS®
networks
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 Backlight 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° F to 200° F
Ambient temperature range: 40° F 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.