Description

The Model 3900 Low Humidity Generator is an extremelyaccurate means of producing known humidity values forcalibrating and verifying humidity instrumentation.  Basedon the combined, NIST proven, fundamental “two-pressure”and “two-temperature” principles, this system willautomatically supply a continuous humidified gas stream,within the frost/dew point range of -95.0°C to 10.0°C, fordays or even weeks unattended.

Simply apply power to the system, and the 3900 will power-up ready to purge and/or generate.  Humidity setpoint valuesare input by the operator from the front panel keypad and arelimited only by the operational range of the 3900 humiditygenerator.

Features

• Traceable to NISTl
• Two-Pressure Two-Temperature Principlel
• Push Button (Keypad) Controll
• Automated Control of User Setpointsl
• Automatically Applies Enhancement Factorsl
• Computerized Internal Transducer Calibrationl
• RS-232C Serial Interfacel
• Only Nine Square Feet of Floor Spacel
• Timed/Formatted Output to Printerl
• Battery Backed-up Real Time Clockl
• Backlit Liquid Crystal Display

Key Specifications

Frost / Dew Point Range: –95 to +10 °C

Frost / Dew Point Uncertainty: (–95 to –90 °C) 0.9 °C

(–90 to –80 °C) 0.5 °C

(–80 to –70 °C) 0.2 °C

(–70 to 10 °C) 0.1 °C

Parts Per Million Range: 0.05 to 12000 PPMv

Relative Humidity Range: 0.0002 to 50%

Saturation Pressure Range:Ambient to 300 psiA

Saturation Pressure Uncertainty (10-50 psiA): 0.05

Saturation Pressure Uncertainty (50-300 psiA): 0.30

Saturation Temperature Range: –80 to +15 °C

Saturation Temperature Uncertainty: 0.08 °C

Saturation Temperature Heating/Cooling Rate: 2 Minutes Per °C Average

Gas Flow Rate Range: 0.1 to 5 L/min

Gas Flow Rate Resolution: 0.02 L/min

Gas Type: Air or Nitrogen

Gas Pressure Rating (MAWP): 350 psiG

Test Port: 1/4 Inch Swagelok® Tube Fitting (6.35mm)

Gas Supply (External): 350 psiG, 5 L/min