Instruction Manual

Page 7 of 26 M2240 R0
1. 2240 General Specifications
• Sensitivity Range: 50 ppm to 100%
• Display Mode: Values below 0.5% are displayed as a bar
graph. Values above 0.5% are reported numerically in
addition to the bar graph..
• Response Time: Initial response less than 1 second at
hydrogen concentrations of 100 ppm and above
• Analog Output – 0-5 V and 4-20 mA
• Serial Output – 9 pin Sub-D connector in RS-232
configuration transmitting ASCII data in an 8 bit stream
with no parity and 1 stop bit.
• Storage and Operating Conditions
• 0 to 50 degrees C.
• 0% to 95% relative humidity (non-condensing).
• Warm-up time: 5minutes (approximately).
• Battery Life: 6 hrs. (continuous use).
• Atmospheric Pressure Influence: As the 2240 is
calibrated at standard sea level conditions, hydrogen
readings must be corrected for altitude. To compensate for
altitude variations, multiply the instrument reading by the
correction factor indicated in Figure 1.
Example:
At an altitude of 800 m there is a correction factor of 1.10.
A hydrogen reading of 1.5% will be corrected for altitude as
follows:
1.5%H
2
X 1.10 =1.65%H
2
Notes and Calculations – enter your corrections for altitude as a record here:
Page 8 of 26 M2240 R0
Figure 1 - Atmospheric Pressure Correction Factor
F = 1E-08m
2
+ 0.0001m + 1
0.98 1.00 1.02 1.04 1.06 1.08 1.10 1.12 1.14 1.16 1.18 1.20 1.22 1.24 1.26 1.28 1.30 1.32 1.34 1.36
-200 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400
Altitude [m]
Alt. Adjustment Scale Factor - F