
ONICON Incorporated 727-447-6140
Page 7
www.onicon.com
SYSTEM-40 BTU MEASUREMENT SYSTEM
1.3 STANDARD FEATURES AND SPECIFICATIONS*
SYSTEM-40 TRANSMITTER
PERFORMANCE
CALCULATOR ACCURACY
Meets EN1434 Class 1 requirements with 3K minimum Δt
Computation Error: ≤ 0.09% at 30°F Δt
REPEATABILITY
≤ ±0.2%
OPERATING CONDITIONS OPERATING TEMPERATURE
-13°F to 131°F
STORAGE TEMPERATURE
-14°F to 158°F
INPUT POWER
20-28V AC/DC, 50/60 Hz, 5 VA maximum
I/O SIGNAL
AVAILABLE OPTIONS
• Two (2) aux pulsed inputs & one (1) aux pulsed output
• One (1) aux pulsed input, one (1) aux pulsed output & one (1)
analog output
ISOLATED ANALOG OUTPUT
May be programmable for energy rate, flow rate, supply temperature,
return temperature or Δt
Configurable: 4-20 mA, 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 Rating: 50 mA, 30 V
Contact Pulse Duration: 50, 100, 500 or 1000 ms
ISOLATED TOTALIZING PULSE
INPUTS
For use with devices providing sinking open collector or dry contact
outputs
Input Rating: 30 VDC, 10 mA maximum
Pulse Duration: 50 ms minimum
ELECTRONICS ENCLOSURE
IP65 polycarbonate with display
WETTED COMPONENTS
Lead-free brass, PEEK
NETWORK CONNECTIONS Isolated RS485 serial interface
AVAILABLE OPTIONS
•
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 – 127 (1 - 247 MODBUS® RTU)
DEVICE INSTANCE RANGE
1 – 4,194,302 (BACnet® only)
PARITY
None, Even, Odd (MODBUS® RTU only)
APPROVALS
FCC
Part 15, Subpart B
BTL
Certified to ASHRAE 135:2009
SYSTEM-40 FLOW SENSOR
PERFORMANCE
SENSING METHOD
Inline wetted ultrasonic sensing (no moving parts)
ACCURACY
±1% of reading over 25:1 turndown
±2% of reading over 100:1 turndown
Overall turndown exceeds 500:1
Meets EN1434 Class 1 accuracy requirements
OPERATING CONDITIONS
Meets EN1434/C900.1 Class A requirements
FLUID TEMPERATURE
32°F to 250°F
MAXIMUM OPERATING
PRESSURE
400 psi
PRESSURE DROP
Less than 1 psi at 4 ft/s, decreasing at lower velocities
*
Specifications subject to change without notice.