Page 1
DEMA BLEND CENTER
MODELS 633MB, 633MB2
1. PARTS:
A. Blend Center assembly B. 1 pc. 8’ long vinyl supply tubing with foot valve
C. 1 pc. Ceramic weight 1/4” ID, Model 633MB2; 3/8” ID, Model 633MB
D. 3 pcs. ea. #8x1-1/2” screws and anchors E. 1 pc. label card
F. Metering tip kit G. 1 pc. 1/4” NPT Garden Hose bushing
H. 1 pc. Hose clamp I. Ball Valve (633MB2 only)
2. INSTALLATION:
This product is designed only to be used as described in this instruction sheet. Adhere to all warnings and
cautions identified in this document.
WARNING: Installations must conform to all local and national plumbing codes and use
approved backflow prevention and pressure relief devices where required.
ALWAYS DISCONNECT DISPENSER FROM WATER SOURCE WHEN DISPENSER
IS NOT IN USE.
Always read SDS for all chemicals used and follow personal protective guidelines.
A) Mounting and Water Supply:
Remove the two cover retainer screws and the cover from the blend center assembly. Hold the unit to the wall and locate the
positions for the mounting screws. Mount the unit to the wall using 2 mounting screws and anchors, and replace the covers
and screws.
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attaching a water supply hose. The
unit is designed so water can be supplied to either side b y interchanging the pipe plug and the female hose fitting. Note:
Apply pipe dope, hand-tighten, and then turn 1-1/2 times with a wrench.
B) Chemical Injection Adjustment:
WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
C) Chemical Supply:
D) Outlet:
DO NOT OVERTIGHTEN.
Chemical feed rates are controlled by a metering tip screwed into the injector barb. Select a tip for the barb using Table 1 as
a guide.
633MB2 only: Screw ball valve onto inlet of injector.
Place the chemical container in a convenient location not more than 6 feet below the blend center (greater lifts will reduce
injection capacity). Slip ceramic weight over tubing and insert the end with the foot valve into the chemical container. Cut
the tubing to any convenient length that will allow it to extend from the bottom of the chemical container to the injector inlet
barb (See figure 1). Gummed labels are provided for labeling chemicals.
Screw outlet hose (not provided) onto outlet of injector using the bushing. Squeeze hose clamp around hose. Locate
position for mounting screw and mount hose clamp to wall using remaining screw and anchor.
3. OPERATION:
The blend center is now ready for use. Depressing the push button opens the valve, allowing water to flow through the chemical
injector that mixes chemical at the desired rate. The button is spring loaded to prevent accidental overflow if unattended, but may
be converted to a locking button by cutting off the tab at the notch (See Figure 2). Pushing the button and turning it 1/4 turn
clockwise at the end of its travel allows the valve to lo ck on. This makes it unnecessary for the attendant to hold the b utton in
while filling large containers. Turning the button in a counterclockwise direction will release it, allowing the valve to shut off.
CAUTION: WHEN SERVICING UNIT BE SURE THAT REPLACEMENT PARTS HAVE BEEN INSTALLED
ACCORDING TO DRAWING. BE CERTAIN CHECK VALVE PARTS ARE IN PLACE.
4. SERVICING: CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING.
A. If unit fails to draw chemical. 1. Is the hose too long? (See Table 2)
2. Is the metering tip blocked? Remove tip and clear blockage. 3. Is the hose kinked or otherwise obstructed?
I-606 Pg. 1 of 4
Rev. B-36300 11/23/10
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DEMA BLEND CENTER
MODELS 633MB, 633MB2
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.
Max. Length
3/8" 1/2" 5/8"
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.
I-606 Pg. 2 of 4
Rev. B-36300 11/23/10
Page 3
DEMA BLEND CENTER
MODELS 633MB, 633MB2
STRAINER WASHER
INLET HOSE ADAPTOR
PUSH BUTTON ACTUATOR
PIPE PLUG
METERING TIP
BALL VALVE
(633MB2 ONLY)
SUPPLY TUBE
TO CHEMICAL
CHEMICAL CONTAINER
CERAMIC
WEIGHT
FOOT VALVE
BUSHING
HOSE CLAMP
FIGURE 1
PUSH BUTTON
UTILITY KNIFE
I-606 Pg. 3 of 4
Rev. B-36300 11/23/10
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14
32
27 28
DEMA BLEND CENTER
MODELS 633MB, 633MB2
12
13
15
26
23
29 30
16
17
18
19
20
21
22
1
(SPECIFY COLOR)
2
(SPECIFY COLOR)
3
4
5
7
6
11
8
9
10
25
24
31
NO. PART NO. DESCRIPTION
1 66-139 Magnet Housing (Specify Color) 19 24-24P Check Valve Ball
2 66-140 Push Button (Specify Color) 20 24-23 Check Valve Spring
3 63-53 Magnet 21 24-34-7 Check Valve Core
4 63-36 Spring 22 25-29 Metering Knob O-Ring
5 41-7-25 Enclosing Tube 23 24-68 Injector Body (P203C Series)
6 63-87 Valve Repair Kit 24 P203CTC-LB Injector (633MB)
7 63-37 Spacer 25 P203CTC-LB2 Injector (633MB2)
8 41-1-8 Kick-Off Spring 26 44-71-1 Ball Valve (633MB2 Only)
9 63-83 Plunger 27 100-12 Vinyl Tube (1/4 ID S 8’ Lg.) (633MB2)
10 41-15-10 Diaphragm 28 100-12L Vinyl Tubing (3/8’ ID X 8’ Lg.)(633MB)
11 63-39 Valve Body 29 61-107-2 Ceramic Weight (633MB)
12 100-38 Strainer Washer 30 61-107 Ceramic Weight (633MB2)
13 63-32 Pipe to Garden Hose Adapter 31 100-11P Foot Valve
14 66-153 Pipe Plug w/ O-Ring 32 60-43 Hose Clamp
15 24-67 Screw (4 Req’d)
16 61-9 Metering Tip (Specify Size)
17 23-32T Metering Knob
18 24-25 Check Valve O-Ring 33 61-9K Metering Tip Kit (13 Sizes)
NO
.
NO
.
PART NO. DESCRIPTION
ACCESSORIES
PART NO. DESCRIPTION
I-606 Pg. 4 of 4
Rev. B-36300 11/23/10
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