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
16
00
1800
2000
2200
2400
A
ltitude [m
]
Alt.
Adju
stme
nt Scal
e Factor
- F