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on the containers. Drying tubes containing the granules should be
clearly labelled “Warning—Avoid contact with skin, eyes, and
clothing.” An example where CO2 is included in our minimum gas
concentration readings is the EO-CO2 (Carboxide) fumigations. Since
the concentration readings obtained represent the sum of the
individual readings for the EO and CO2, Ascarite® must not be used in
this instance.
After the final reading has been taken, the unit should be thoroughly
purged by disconnecting from the sampling tube and allowing the
pump to draw fresh air through the instrument for several minutes.
Repair and Calibration
The T/C unit will hold its calibration for a considerable length of time
under normal service. To ensure that all units are providing accurate
gas concentration readings, T/C units should be recalibrated at least
annually; calibrate more often if use is frequent.
The instrument should be sent by Priority Mail or Air Parcel Post
directly to the manufacturer or an ouside contractor. Prepare a
memorandum to accompany each instrument explaining the need for
sending the unit. Make sure all instruments are shipped with the a
proper return address, name of a contact person, and telephone
number. The T/C unit should be calibrated only for MB, unless the
PPQ office requests calibration for CB, SF, or other specified
fumigants: All port locations will be responsible for payments to
contrators.
Use one of the following contractors for repair and calibration:
Key Chemical and Equipment Co. (BPA# 45-6395-3-2872)
13195 49th St. North
Unit A
Clearwater, FL 33762
Equipment
Fumiscope and Gow-Mac
8-1-8 Treatment Manual 06/2004-01
PPQ
tel (727) 572-1159
fax (727) 572-4595
($50.00 plus shipping per unit calibrated)
Cardinal Professional Products (BPA# 45-6395-3-2871)
2641 W. woodland Drive
Anaheim, CA 92801
tel (714) 761-3292
fax (714) 761-2095
($55.00 plus shipping per unit calibrated)
Maintenance
The T/C unit requires the same attention as any other equipment if it
is to function properly. While the instrument is designed specifically
for field use, the components, particularly the meter, may be damaged
easily. Careful handling is essential to maintain an instrument
capable of accurate gas concentration readings. If repairs are needed
and are extensive, or the parts are not readily available, there will be a
delay in returning the instrument. Should the need for a substitute T/
C unit occur, the port should be prepared to obtain one from another
source.
FIGURE 8-1-1: Fumiscope reading of 20 ounces per 1,000ft3
Equipment
Halide Detector
06/2004-01 Treatment Manual 8-1-9
PPQ
Halide Detector
The halide gas detector has a long history of commercial usage as a
leak detector for halide refrigerant gases. For fumigations, the halide
detector has been used both as a leak detector to locate fumigant
leakage around chambers, application equipment, temporary
enclosures, and as a safety device around fumigation sites. It is also
used to indicate freedom from gas concentrations of MB which may be
absorbed from treated commodities. As a precautionary safety
measure, it should be used regularly in rooms in which MB chambers
and MB treated commodities are stored or located.
Principles of Operation
The halide gas detector is used to indicate the presence and
approximate concentration of MB or other halogenated compounds in
the air. This is accomplished by passing the air-gas mixture over a red
hot copper plate or cone through or over which a flame is passing. The
color and its intensity imparted to the flame indicates the presence
and concentration of the halide gas.
Since the detector will react with other halide gas such as Freon™,
a simple demonstration can be shown in the laboratory or office in the
following manner:
1. Insert a funnel in the end of the detector search hose.
2. Light the unit (see the following section on Usage).
3. Direct a small amount of Freon™ propelled aerosol across the
mouth of the funnel (aerosols used in PPQ aircraft treatments
may be used).
4. A blue-green flame will be produced by the Freon™ gas as it
contacts the heated reaction plate demonstrating what will occur
when MB or other halogen gas is present.
Description
Basically, all halide detectors are quite similarly constructed, differing
only in detail by the various manufacturers. Each consists of a fuel
tank, a valve assembly to regulate fuel flow, a burner head assembly
where the fuel and air mix and unite, the reaction plate or cone
　
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