APPENDIX B
B - 3
Halocarbon (CH
2
Cl
2
)
Part No.: 012-3023-005
Standard Lamp
Typical Range (ppmv)
11.7 eV
0.1 - 200
Temperature Range: 2-40
°
C (41-104
°
F)
Substance
Meas.
Time (sec)
Vol.
(mL)
Temp (
°
C)
2-10 10-15 15-30 30-40
Methyl Chloride
30
180
Temp (
°
F) 36-50 50-60 60-86 86-104
Methylene Chloride (MC)
30
180
Time (sec)
3x 2x 1x 0.67x
Chloroform
45 260
Carbon
Tetrachloride 60 350
Calibration should be performed at the same temperature as the
measurement.
Humidity: No effect on reading 0 - 95% RH. Humid, clean air drawn through
the tube before measurement will reduce VOC capacity.
Storage Life and Conditions: Unopened tubes can be stored for 1 year in
darkness at 5 - 25
°
C (40 - 77
°
F). Open tubes may be stored for up to 8
hours in clean air at 50% RH without significant loss of capacity.
Color Change: Orange
→
Brown
The reading may be high if the tube is discolored to more than ¾
of its length.
Storage Life and Conditions: Unopened tubes can be stored for 2 year
in darkness at 0 - 40
°
C (32 - 104
°
F). Open tubes may be stored for up
to 8 hours in clean air without significant loss of capacity.
Note: For more details on tube operation see Technical Note 133.
Cross-sensitivity:
Substance
Test Conc.
(ppmv)*
Apparent MC
Response
Acetone 300
0.0
Ethanol 300
0.0
Ethyl acetate
300
0.0
Toluene 300
0.0
Methane 25000**
0.0
Isobutylene 500 0.1
n-Octane 200
0.0
Tetrahydrofuran 50
0.5
*Not necessarily the maximum allowable concentration.
** Methane above 1% by volume reduces the PID response, but has no effect on tube
capacity. Butane and higher hydrocarbons reduce tube capacity.
Note:
Each tube contains about 3 mg of chromium compounds
.
