Model 137 Vigilant Aircraft Hygrometer
The EdgeTech Model 137 Vigilant Aircraft Hygrometer is a
rugged, shock mounted military qualified instrument used for the
primary measurement of dew point in flight or in installations with
existing flow, such as wind tunnels.
It features a miniature remote dew point sensor employing a platinum resistance
thermometer, and has 15 feet of interconnecting cable to
the control unit. Precision calibration units for the linear analog
outputs are included.
The specially designed dew point sensor is mounted through the skin
of the aircraft and is mounted to either the left or right side of the aircraft.
The dew point is detected by using chill mirror technology assuring
precision accuracy, repeatability and reliability.
How to Order a Model 137 Vigilant:
137 Electronic control unit
Dew Point Sensor (required to select one):
A1 Single stage dew point sensor (45°C depression)
A3 Three stage dew point sensor (65°C depression)
Mounting Configuration (select one):
AS/L Aircraft sampling module, Left side to pilot perspective
AS/R Aircraft sampling module, Right side to pilot perspective
Options:
CBL Additional sensor cable over 15 feet
Example:
137-A3-AS/L-CBL (25FT)
Aircraft Hygrometer
Model 137
S P E C I F I C A T I O N S
Dew/Frost Point Range
-40° to +60°C (-40° to +140°F) A1 Sensor
-50° to +90°C (-58° to +200°F) A3 Sensor
Dew/Frost Point Accuracy
±0.20°C (±0.36°F) nominal
Dew/Frost Point Sensor
3-wire Platinum Resistance Thermometer (PRT),
100 ohms at 0°C, nominal
Depression
45°C (81°F), nominal, A1 Sensor
65°C (117°F), nominal, A3 Sensor
Sensor Materials
Chromium, glass, epoxy, anodized aluminum
Slew Rate
1.5°C (2.7°F)/second max, above 0°C
Repeatability
±0.05°C (0.09°F)
Hysteresis
Negligible
Precision Resolution
0.1 degrees C or F
Sample Flow Rate
0.25-2.5 liters/minute (0.5-5.0 SCFH)
Operating Temperature
Control Unit: 0° to +50°C (+32° to +122°F)
A1 Sensor: -40° to +60°C (-40° to 110°F)
A3 Sensor: -50° to +100°C (-58° to 212°F)
Display
LCD graphics backlit display
0.25-in. high digits
Toll Free: 800-276-3729 Ph: 508-263-5900 Fax: 508-486-9348
E-mail: h2o@edgetech.com Web: www.edgetech.com
Analog Output
Voltage
0 to 5 VDC, scalable from -75° to +100ºC (-103° to +212ºF)
1 K ohms minimum load resistance
Current
4 to 20 mA, scalable from -75° to +100ºC (-103° to +212ºF)
1000 ohms maximum loop resistance
Serial Digital Communication
RS-232C compatible
9-pin D sub-miniature connector (female)
Baud Rates: 1200/2400/4800/9600/19200 Protocol: N81
Output of time, date and dew/frost point at timed Intervals
Programming of most keypad functions
Auto Balance Control:
Manual initiation of ABC at any time
Automatic ABC with start time and interval programmable
from keypad or RS-232 port
Outputs programmable for Track or Hold during ABC
Physical:
Shipping weight:
11 pounds (5 kg) with sensor
Dimensions:
Less shock mount base (LxWxH): 13 x 7.6 x 4.9 inches
(33 x 19.2 x 12.4 cm)
With shock mount base (LxWxH): 13.1 x 7.6 x 5.8 inches
(33 x 19 x 14.6 cm)
Power Requirements:
90 to 240 VAC, 50-60 Hz
75 watts maximum
Fuses:
90 - 150 VAC Operation: 1A, 3 AG, 250 VAC, Slo-Blo
160 - 240 VAC Operation: 1A, 3 AG, 250 VAC, Slo-Blo
Keypad
Five soft keys for setup and operation: Displayed parameter selection: °C/°F toggle: View/change time, date: digital
averaging: baud rate: Manual Auto Balance Cycle initiate: Program Auto Balance Cycle for start time, interval, output
Track/Hold: Maximum Heat toggle: Maximum Cool toggle: View/change high and low limits for analog outputs: View/change
Alarm parameters, high/low limits, high or low alarms, latched or unlatched relays, Reset front panel Alarm indicators
(latched only).
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