Page 1
DEMA BLEND CENTER
MODEL: 681-2-163T
INSTALLATION INSTRUCTIONS
1. PARTS
A. Blend center assembly.
B. 2 pcs. 3/8"ID x 8ft. long vinyl supply tubing, foot valve and ceramic weight.
C. 1 pc. 1 /2"ID x 10ft. long vinyl outlet tubing.
D. 2 pcs. #10 Phillips head 3/4 " long mounting sc rews & anchor s.
E. 1 pc. label card.
F. Metering tip kit.
2. INSTALLATION
Note: All installations must conform with local plumbing codes and use approved backflow preventers.
A. Mounting and water supply
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Use mounting template enclosed to locate the mounting screw positions. Drill all of the holes into the drywall usi ng a 1/4” di am ete r
bit for use with the included #10 screw and anchor set. (If mounting the Blend Safe to wood and you do not plan to use the in clu ded
anchors, drill 1/8” diameter holes.) Insert the anchors into drilled holes and hammer them into the wall until they are f lu sh wi th f ace
of wall. Assemble all of the #10 screws with a phillips screwdriver into the anchors so the screw h eads are sticking o ut of the wall
appr oximately ½”. Mount the Blend S afe by inserting the screw heads through the keyhole slots in the base and tightening the
screws.
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attaching a water supply hose. The w ater
inlet may be removed to permit direct connection to a 3/8" NPT pipe. The unit is designed so water can be supplie d t o e it her sid e by
interchanging the pipe plug with the water inlet assembly.
Note: Apply pipe dope, hand tighten, then turn 1 ½ times with a wrench. Do not over tighten.
WARNIN G: Do not use Teflon® tape to seal internal plastic threads as the extra thickness of the tape may cause the
plastic to crack. Use a non-welding liquid sealant instead.
B. Chemical supply
Place the chemical containers in a conveni ent location no t more than 6 feet below the blend cent er (greater lift s wi ll re du ce in je ct io n
capacities) . Insert the vinyl supply tubing with the foot valve ends into the chemical containers. Cut the vinyl tubes to any
convenient length that will allow them to extend from the bottom of the chemical container to the proportioner inlet barbs. (See
figure 1). Gummed labels are provided for product labeling.
C. Outlet
D. Chemical injection adjustment
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Cut the 1/2 "ID outlet tubing to the desired lengths and attach them to the proportioner outlets; model 681-2 with the standard 4
GPM flow rate proportioners - Do not cut tubing to less than 18" long to insure priming. Longer lengths may be used up to 10 fe et.
Models with the optional 1 GPM proportioners may use tubing cut to any length.
WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
Chemical feed rates are controlled by metering tips screwed into the proportioners barbs. Select a tip for e ach ba rb u si ng Ta ble 1 o r
2 as a guide.
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1 cps (centipoise) is equal to the viscosity of water
75 cps is approximately equal to the viscosity of 10 weight motor oil
200 cps is approximat ely equal to t he viscosity of most dishwashing deterge nts
I-448 Pg. 1 of 5
Rev. B29019
Page 2
Metering Tip Color
Clear
Purple
Yellow
Green
Pink
Turquoise
Black
Gray
Red
Blue
Brown
White
Orange
Light Blue
Tan
No Tip
* Tips are available upon request.
Metering Tip Color
Clear
Purple
Yellow
Green
Pink
Turquoise
Black
Gray
Red
Blue
Brown
White
Orange
Light Blue
Tan
No Tip
DEMA BLEND CENTER
MODEL: 681-2-163T
INSTALLATION INSTRUCTIONS
Table 1
4 GPM flow rate
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
0.30 430-1 0.22 592-1 0.13 864-1
0.48 265-1 0.32 406-1 0.24 524-1
1.28 100-1 0.82 157-1 0.6 212-1
1.67 77-1 1.29 99-1 1 128-1
2.36 54-1 1.65 77-1 1.25 103-1
3.76 34-1 2.55 50-1 1.85 69-1
4.47 29-1 3.03 42-1 2.12 60-1
5.53 23-1 3.67 35-1 2.58 50-1
7.00 18-1 4.79 27-1 2.79 46-1
8.78 15-1 5.39 24-1 3.06 42-1
10.95 12-1 6.49 20-1 3.35 38-1
14.19 9-1 7.08 18-1 3.46 37-1
17.58 7-1 7.91 16-1 3.71 35-1
21.75 6-1 8.66 15-1 3.9 33-1
27.98 5-1 9.15 14-1 4.11 31-1
33.15 4-1 10.54 12-1 4.52 28-1
Note: All induction rates are based on a water inlet pressure of 40 psi.
Table 2
1 GPM flow rate
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
2.28 56-1 0.63 204-1 0.44 292-1
2.98 43-1 1.22 105-1 0.76 168-1
5.18 25-1 2.51 51-1 2.01 64-1
6.37 20-1 4.22 30-1 3.14 41-1
8.76 15-1 5.59 23-1 4.17 31-1
12.01 11-1 8.44 15-1 6.12 21-1
15.16 8-1 9.93 13-1 7.09 18-1
18.97 7-1 12.55 10-1 8.73 15-1
25.38 6-1 15.84 8-1 10.07 13-1
28.24 5-1 17.92 7-1 11.7 11-1
36.99 4-1 21.31 6-1 12.04 10.5-1
45.52 3-1 25.26 5-1 12.67 10-1
53.31 2.5-1 28.44 4.5-1 13.14 9.75-1
60.27 2.25-1 30.5 4-1 13.51 9.5-1
72.94 2-1 33.4 3.75-1 14 9-1
77.90 1.75-1 35.85 3.5-1 14.5 8.75-1
I-448 Pg. 2 of 5
Rev. B29019
Page 3
DEMA BLEND CENTER
MODEL: 681-2-163T
INSTALLATION INSTRUCTIONS
3. OPERATION
The Blend Center is now ready for use. Depressing a push button opens the valve, allowing water to flow through the chemical
proportioner that mixes chemical at the desired rate. The buttons are spring loaded to prevent accidental overflow if unattended, but
may be converted to locking buttons by cutting off the tab at the notch. (See Figure 2). Pushing the button and tubing it 1/4 turn
clockwise at the end of its travel allows the valve to lock on. This makes it unnecessary for the attendant to hold the button in while
filling large containers. turning the button in a counter clockwise direction will release it, allowing the valve to shut off.
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4. SERVICING
CAUTION: TURN OF F WATER SUPPLY BEFORE SERVICING.
A. Proportioner fails to draw chemical
1. Proportioner outlet tubing is cut too short for priming. Pinch outlet tube to create back pressure which wil l cause unit to prime.
2. Insufficient water supply pr essure. 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. Prop ortioner metering tip clogged with dr ied chemical. Remove tip and tr y injecting hot water to clear interior passages.
C. Proport ioner continues to draw chemical after water va lve closes
Chemical supply is higher than bottom of discharge tube creating a natural siphon. Lower the chemical supply or hang up outlet
tubing after use.
D. Valve malfunction
Check that the button moves freely up & 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 ca ref ul ly
pull off the enclosing tube so as not to drop the plunger, kick-off spring, and spacer. Check for dirt of damage impending 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.
CAUTION: When servicing unit, be sure that replacement parts have been installed according to drawing.
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The foot valve will keep the inlet tube primed thereafter.
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RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHO UT 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 ca use d by chemicals, corr osi on, impr op er voltage s up p ly, physical
abuse, or misapplication. Rubber and synthetic rubber parts such as “o”- rings, diaphragms, squeeze tubing and
gaskets ar e cons idered exp endab le and ar e not cover ed under war ranty. This war ranty is extended only to the
original b uyer of DEMA products. If products a re altered or repair ed without prior ap proval 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 r eplaced 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-448 Pg. 3 of 5
Rev. B29019
Page 4
DEMA BLEND CENTER
MODEL: 681-2-163T
INSTALLATION INSTRUCTIONS
I-448 Pg. 4 of 5
Rev. B29019
Page 5
DEMA BLEND CENTER
MODEL: 681-2-163T
INSTALLATION INSTRUCTIONS
16
17
15
19
18
18
14
13
12
1
2
3
4
5
20
23
7
8
6
9
21
10
QTY.
1
2
3
4
5
6
7
8
9
10
11
PART NO.
66-139
66-140
63-35
63-36
41-7-25
63-87
63-37
41-1-8
63-38
41-15-5
63-39
DESCRIPTION
Magnet Housing (Specify Color)
Push Button (Specify Color)
Magnet
Spring
Enclosing Tube
Valve Repair Kit
Spacer
Kick-off spring
Plunger
Diaphragm
Valve Body
QTY.
12
13
14
15
16
17
18
19
20
21
22
23
22
PART NO.
100-38
65-10-2
65-14-2
66-31
66-153
34-22-4
61-22GAP-1
61-9K
61-21
100-12L
61-107
68-6-QD2
11
DESCRIPTION
Strainer Washer
Coupling
Hose Fitting Stem 2.56" Lg.
Close Nipple
Pipe Plug & O-Ring Assy.
Siphon Breaker
4 GPM (3/8" Barb) Proporti oner (Gray)
Metering Tip Kit (15 Sizes) (3/8" Barb)
1/2" ID X 6' Lg. Vinly Outlet Tube (4 GPM Only)
3/8" ID X 8' Lg. Vinyl Supply Tubing
Ceramic Weight (3/8" ID Tube)
ACCESSORIES
Pressure Indicating Tee
I-448 Pg. 5 of 5
Rev. B29019
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