DEMA BLEND CENTERS
MODEL 681GAP-2P
INSTRUCTION SHEET
I-795
Pg. 2 of 4
Rev. B-36452 1/5/11
TABLE 2 - 4 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING
Injection Rates For Viscosities Shown
1 cps
75 cps
200 cps
Metering Tip Color
Oz/Gal
Ratio
Oz/Gal
Ratio
Oz/Gal
Ratio
Tan
0.33
387-1
0.26
500-1
0.12
1090-1
Orange
0.42
307-1
0.32
430-1
0.17
735-1
Turquoise
0.51
251-1
0.34
382-1
0.19
676-1
Pink
0.78
165-1
0.56
230-1
0.3
422-1
Light Blue*
0.87
147-1
0.67
192-1
0.33
391-1
Brown
0.99
129-1
0.74
174-1
0.37
345-1
Red
1.37
93-1
0.91
141-1
0.44
289-1
White
1.52
84-1
1.04
123-1
0.48
264-1
Green
1.72
74-1
1.22
105-1
0.52
244-1
Blue
2.13
60-1
1.27
101-1
0.54
239-1
Yellow
3.05
42-1
1.71
75-1
0.56
229-1
Black
4.50
28-1
1.96
65-1
0.57
224-1
Purple
7.75
17-1
2.4
53-1
0.59
217-1
Gray
9.86
13-1
2.54
50-1
0.63
204-1
No Tip
19.63
7-1
3.16
40-1
0.67
190-1
NOTE: Leaner dilutions can be achieved by ordering DEMA ultra lean tip kit 100-15KU or capillary tip 44-61P.
4.
SERVICING
:
CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING.
A. Proportioner fails to draw chemical
:
1. Pinch outlet tube to create back pressure, which will cause unit to prime. The foot valve will keep the inlet tube primed.
2. Insufficient water supply pressure. 20 PSI is the minimum allowable.
B.
Proportioner stops drawing chemical:
1.
Inspect foot valve for dried chemical or dirt. Soak in hot water to clean.
2.
Proportioner metering tip clogged with dried chemical. Remove tip and try injecting in hot water. If there is no suction, remove
proportioner and soak in hot water to clear interior passages.
3.
Inspect proportioner to ensure that there are no mineral deposit build-ups on the nozzle. If so, soak proportioner body in de-
liming solution. (Remove all parts attached to proportioner before soaking in de-liming solution.)
Note: Use care when
handling hazardous chemicals.
C. Proportioner continues to draw chemical after water valve closes
: Chemical supply is higher than bottom of discharge tube
creating a natural siphon. Lower the supply vessel or hang up outlet tube after use.
D. Valve Malfunction
: Check that the button moves freely in & out and that a "click" can be heard when the button is pushed and
released, indicating that the magnet is activating the plunger properly. Remove cover. To inspect internal parts, unscrew magnet
housing and carefully pull off the enclosing tube so as not to drop the plunger, kick-off spring, and spacer. Check for dirt or damage
impeding plunger and kick-off spring movement. Inspect the diaphragm, making sure the two small pinholes (bleed hole) in the
diaphragm convolution are clear to allow the valve to close.
CAUTION: When servicing unit, be sure that replacement parts have been installed according to drawing.
RETURNS:
NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITTEN PERMISSION.
RETURN MERCHANDISE AUTHORIZATION NUMBER REQUIRED IN ADVANCE OF RETURN.
WARRANTY:
DEMA products are warranted against defective material and workmanship under normal use and service for one year from
the date of manufacture. This limited warranty does not apply to any products which have a normal life shorter than one year
or failure and damage caused by chemicals, corrosion, improper voltage supply, physical abuse, or misapplication. Rubber
and synthetic rubber parts such as “O”- rings, diaphragms, squeeze tubing and gaskets are considered expendable and are not
covered under warranty. This warranty is extended only to the original buyer of DEMA products. If products are altered or
repaired without prior approval of DEMA, this warranty will be void.
Defective units or parts should be returned to the factory with transportation prepaid. If inspection shows them to be
defective, they will be repaired or replaced without charge, F.O.B. factory. DEMA assumes no liability for damages. Return
merchandise authorization number, to return units for repair or replacement, must be granted in advance of return.