Calibration Instructions - DuPont FROTH-PAK Manual

9 . Slowly turn on the in-line on-off valves . The handles
should be parallel to the chemical lines . Verify that the
connections of each valve are tight and that no chemical
leaks are present .
10 . Remove the used nozzle by pushing down the
nozzle ejector .

4.2 Calibration Instructions

Equipment needed: PPE, scale capable of weighing in grams,
paper bags (lunch bags), calibration nozzles, and pressure
gauges .
1 . Collect items needed for calibration (scale that weighs in
grams or ounces, lunch bags, marker, calculator, pen,
writing pad, petroleum jelly)
2 . Ensure chemical temperature in tanks and lines are
75-90 degrees F (24-32 degrees C) , minimum 65 degrees F
(18 degrees C) .
3 . Pressurize the system .
a) Fully open the valve on the nitrogen bottle .
b) Ensure the tank has at least 500 PSI pressure on
the main tank pressure gauge . If at or below this,
order a new tank . Do not operate under 300 PSI .
Recommended Starting Pressures
A side
Insulation Class A 180
Sealant 180
c) Now set the A and B side regulators to their initial
pressure . Turn the handle clockwise to increase the
pressure . Higher hose lengths will require higher
pressures . Follow the nitrogen hoses to the tank and
slowly open the nitrogen valves on the tank to
pressurize the tanks . You will hear the nitrogen
flowing as it pressurizes the cylinders . Check for
nitrogen leaks as you are pressurizing the tanks .
d) Slowly open the chemical valves on both the A and B
sides at the tanks to pressurize the hoses . For each side,
there are two valves to open; one valve at the tank and
one ball valve at the filter/hose connection . On the
A-side open the tank valve first and then open the
ball valve . Repeat for the B side . Check for chemical
leaks as you are pressurizing the hoses .
Note: Should you experience any nitrogen or chemical leaks, immediate close
all chemical and nitrogen valves and correct the situation before proceeding
12
4 .
5 .
6 .
7 .
B side
8 .
180
180
9 .
10 . Calculate the A to B ratio from the data you recorded .
Set pressures at recommended settings .
Check the gun to make sure it is working properly .
a) Open the two chemical valves at the gun . You will see
chemical flowing into the gun when they are opened .
b) Fully depress the gun trigger and spray the gun
into a lined waste receptacle to purge the gun and
chemical lines of nitrogen . You should see two good
chemical streams coming from the gun .
) Spray Great Stuff Pro
c ™
of the gun to clean away any chemical residue . It is
important to keep the gun face clean to avoid plugging
of the chemical flow and to ensure that the nozzle
makes a leak proof connection .
d) Place a small amount of petroleum jelly on outside
face of gun where the nozzle fits in to ease the process
of attaching the nozzle .
Attach the appropriate calibration nozzle . The calibration
nozzle has 2 tubes protruding from the front of the nozzle
For calibration purposes, the back cap color of calibration
nozzle should match the color of the spray nozzles that
you intend to use .
The nozzles are a tight fit . Typically you will hear two clicks .
Ensure that the yellow catch is fully latched over the
extension on the nozzle .
Label 2 bags; one bag A and one bag B . Place the A side
nozzle in the bag labeled A and the B side nozzle in the
bag labeled B . Fully depress the gun trigger and spray the
chemical into the 2 bags for 5–10 seconds or until the bags
are about 2/3 full .
Weigh the A side first and record the weight (in grams) .
Next, weigh the B side and record the weight (in grams or –
be sure to use the same units on the A and B side) .
Enter the A Side weight into the calculator and divide it
by the B Side weight .
A to B Ratios
Best/Optimal:
Good:
Ok:
180 divided by 162 equals 1 . 1 1 ratio
A
Weight 188gms
Bag Weight -08gms
180gms
Foam Cleaner into the face
1 . 1 0:1
1 .05:1 - 1 . 1 5:1
1 .0:1 - 1 .2:1
B
170gms
-08gms
162gms