SECTION 2.0: Specifications
2.2 VARI-GREEN
®
TRANSMITTER SERIES
SENSOR DENSITY
Maximum number of sensors per transmitter is
32 total sensors per probe array or measurement station
DISPLAY
Backlit
¼
V
GA Color TFT LCD display, 2.75” X 2.0”
Configuration Access:
Field programmable menu driven user interface
accessed via four button membrane keypad. Field
selectable in U.S. or S.I. units for flow, velocity and
temperature.
POWER SUPPLY
24 VAC (20-28 VAC) or 24 VDC (20-40 VDC), isolated
and fused with reverse polarity protection
16-50 VA, varies based on the quantity of sensors
(1-32) in the probe array or station
OUTPUT SIGNALS PROVIDED
Dual analog outputs, field selectable via menu for 0-5
VDC, 0-10 VDC, or 4-20 mADC
Field adjustable analog output scaling of airflow velocity
and temperature
Velocity Range:
0 to 5,000 FPM in Ducted Applications
Temperature Range: -20° to 140° F
AMBIENT CONDITIONS
Temperature Limits: –20° F to 180° F Storage, -20° to
+140° F Operating
Humidity: 0 to 99.9% RH, non-condensing
ENCLOSURE
NEMA 1 aluminum with hinged cover
APPROVALS
UL 60730 PENDING
BTL
FCC Part 15 Subpart B, Class A Device
2.1 PROBE ASSEMBLY
INDIVIDUAL SENSOR ACCURACY
Velocity: ±2% of reading from 0-5000 FPM
Temperature: ±0.1° F
Multi-point NIST traceable calibration of both
temperature and velocity
SENSOR TYPE
Her metically sealed, precision matched thermistors with
laser trimmed resistive heating element mounted in
flow conditioning aperture.
Max number of sensors per probe: 8
Max number of sensors per transmitter: 32
SENSOR SIGNAL PROCESSING
Sen sor signal processing at the probe with RS-485
communication to the transmitter
MOUNTING
Ins ertion probe mounting via 4 in. x 4 in. aluminum
plate,
1
⁄
4
in. closed cell neoprene gasket and end
support stud for probes longer than 18 in.
MATERIALS OF CONSTRUCTION
1.1 25 in. diameter anodized aluminum probe with
aluminum probe connection box
ELECTRICAL CONNECTIONS
Pro be-to-probe connection via plenum rated cable
with mini-DIN Snap & Lock connector for signal and
power
Pro be-to-transmitter connection via a single plenum
rated cable with mini-DIN Snap & Lock connector
Cab le Length: 10 ft. typical, up to 100 ft. optional
(cables can be field terminated to length)
PROBE SIZE RANGE
8 in. to 120 in. dimension length
Vari-Green® Transmitter
3
®
