Chapter 4: Specifications
4.1 General
Dew point/frost point calibration range
• 68° to –112°F (20° to –80°C)
Operating temperature:
• –4° to 140°F (–20° to 60°C)
Storage temperature:
• 158°F (70°C) maximum
Warm-up time
• Meets specified accuracy within three minutes
Calibrated accuracy (dew/frost point)
• ±3.6°F (±2°C) from –85° to 50°F (–65° to 10°C)
• ±5.4°F (±3°C) from –112° to –86°F (–80° to –66°C)
Repeatability (dew/frost point)
• ±0.9°F (±0.5°C) from –85° to 104°F (–65° to 40°C)
• ±1.8°F (±1.0°C) from –112° to –86°F (–80° to –66°C)
Response time
• Less than five seconds for 63% of a step change in
moisture content in either a wet-up or dry-down cycle
4.2 Electrical
Power
•
Input:
12 to 30 VDC (loop-powered, customer supplied)
•
Output:
4 to 20 mA analog, RS485 digital
•
Output resolution:
0.01 mA/12 bits
•
Maximum load resistance:
Ω = (PSV x 33.33) – 300,
where PSV = power supply voltage
Example:
Given a 24 VDC power supply,
Max. load resistance = (24 x 33.33) – 300 = 500 Ω
•
Cable:
6 ft (2 m), standard
(consult Panametrics for custom lengths)
Input parameters for loop-powered intrinsic safety
U
i
= 28V
P
i
= 0.653W
L
i
= 62µH
I
i
= 93.3mA
C
i
= 0
RS485
U
i
i = 3.72V
P
i
= 212mW
L
i
= 62µH
I
i
= 228mA
C
i
= 67µF at 5.36V
4.3 Mechanical
Sample connection
• 3/4-16 (19 mm) straight male thread with o-ring
• G ½ with optional adapter
Operating pressure
• 5 µmm Hg to 5,000 psig (345 bar)
Enclosure
• Type 4x / IP67
Dimensions
• Overall (H x W x D):
7.88 x 3.99 x 2.56 in. (200 x 101 x 65 mm)
• Weight: 1.2 lb (550 g)
4.4 Moisture sensor
Sensor type
• Thin-film aluminum oxide moisture sensor probe
Calibration
• Each sensor is individually computer-calibrated against
known moisture concentrations, traceable to NIST
Calibration interval
• Sensor recalibration at Panametrics is recommended
every six to twelve months, depending on the application
Flow rate
•
Gases:
Static to 100 m/s linear velocity at a pressure
of 1 atm.
•
Liquids:
Static to 10 cm/s linear velocity at density
of 1 g/cc
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