DEMA BLEND CENTER
MODELS 633MB, 633MB2
I-606
Pg. 2 of 4
Rev. B-36300 11/23/10
B. If unit stops drawing chemical.
1. Is the foot strainer clogged? Lift from drum and clean.
2. Is the metering tip blocked? Remove and clean.
3. Is the injector check valve clogged? Remove square,
plastic metering knob to inspect check valve ball, spring and O-ring.
C. Injector continues to draw chemical after water valve closes: Chemical supply is higher than bottom of discharge hose
creating a natural siphon. Lower the supply vessel or hang up outlet hose after use.
D. Valve Malfunction:
Check that the button moves freely up and down 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 pin holes (bleed
holes) in the diaphragm convolution are clear to allow the valve to close.
TABLE 1
Tip Color
1 cps
75 cps
200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Clear
0.89 143 0.39 326 0.23 553
Purple
1.18 109 0.57 225 0.44 293
Yellow
1.93 66 1.17 109 0.88 145
Green
3.17 40 2.26 57 1.79 72
Pink
4.19 31 2.96 43 2.21 58
Turquoise
6.51 20 4.77 27 3.63 35
Black
7.14 18 5.85 22 4.49 29
Gray
9.28 14 7.27 18 5.47 23
Red
12.71 10 9.19 14 6.45 20
Blue
13.96 9 10.31 12 7.11 18
Brown
17.32 7 12.61 10 7.97 16
White
20.34 6 14.31 9 8.61 15
Orange
21.04 5 15.32 8 8.95 14
No
Tip
23.94 4 17.02 7 10.61 12
TABLE 2
Hose I.D.
3/8" 1/2" 5/8"
Max. Length
15 ft.
50 ft.
100 ft.
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.
