Page 1
DEMA BLEND CENTER
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
1. PARTS CHECKLIST
A. Blend Center Assembly B. Vinyl Supply Tubing with Foot Valve Assembly
C. Ceramic Weight D. Vinyl Outlet Tubing
E. Screw and Anchor Kit F. Label Card G. Metering Tip Kit
2. INSTALLATION
Pressure indicating tee is to be installed with existing faucets according to local plumbing codes in the state of W is cons i n and any
other state that requires the us e of a pressure indicating tee. WARNIN G: Water supply should not exceed 125 psi and water
temperature must not exceed 150° F.
A. Mounting and water supply
Remove the two cover retainer screws and the cover from the Blend Center assembly. Mount the unit(s) in position on the wall
and locate the position for the mounting screws. Drill all of the holes into the drywall using a ¼” diameter bit for use with the
included #10 screw and anchor set. (If mounting the Blend Center to wood and you do not plan to use the included anchors, drill
1/8” diameter holes.) Insert the anchors into drilled holes and hammer them into the wall until they are flush with face of wall.
Assemble all of the #10 screws with a Phillips screwdriver into the anchors so the screw heads are sticking out of the w all
approximately 1/8”. Mount the Blend Center by inserting the screw heads through the keyhole slots in the base and tighten the
screws. Replace the cover 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 by 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. DO NOT OVER
TIGHTEN.WARNING: Water supply should not exceed 125 psi and water temperature must not exceed 150°F. WARNING:
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. Pressure Indicating Tee Installation
Screw female quick disconnect to faucet and attach pressure indicating tee to female quick disconnect. Attach female end of
reinforced hose to male threads of tee, then attach the male end to the f emale garden hose f itting at the w ater inlet of the Bl en d Ce nt er
(See Figure 3).
C. Chemical supply
Place the chemical containers in a conv enient locatio n not m ore than 6 feet below th e blend center (greater lifts will reduce in je cti o n
capacities). Insert the vinyl supply tubing with the foot valve ends into the chemical containers. Cut the viny l tu bes to an y co nv eni en t
length that will allow them to extend from the b ottom of the chemical container to the pr opor tioner inlet bar b s. (See Figure 1) .
Gummed labels are provided for product labeling.
D. Chemical injection adjustment
Chemical f eed rates are controlled by metering tips screwed into the proportioner barbs. Select a tip using Table 1 or 2.
Metering Tip Color
*Metering tip color was formerly clear. All induction rates are based on a water pressure of 40 psi.
I-796 Page 1 of 6
Rev. D-36452 5/05/11
:
: Note: All installations must conform to local plumbing codes and use approved backflow preventers.
:
:
:
: WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
1 cps (centipoise) is equal to the viscosity of water
75 cps is approx imately equ al to th e viscosity of 10 weight motor oil
200 cps is approximately equal to the viscosity of most dishwashing detergents
TABLE 1 - 1 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 1.03 125-1 0.76 168-1 0.38 333-1
Orange 1.24 103-1 0.98 130-1 0.53 241-1
Turquoise 1.43 89-1 1.07 119-1 0.61 211-1
Pink 2.47 52-1 1.58 81-1 0.92 139-1
Light Blue* 3.05 42-1 2.1 61-1 1.06 121-1
Brown 3.48 37-1 2.31 55-1 1.15 111-1
Red 4.38 29-1 2.83 45-1 1.23 104-1
White 5.33 24-1 3.1 42-1 1.37 93-1
Green 6.38 20-1 3.63 35-1 1.4 91-1
Blue 6.77 19-1 3.78 34-1 1.45 88-1
Yellow 9.90 13-1 5.1 25-1 1.48 86-1
Black 15.00 9-1 6.54 20-1 1.53 84-1
Purple 24.94 5-1 7.28 18-1 1.57 82-1
Gray 35.94 4-1 8.5 15-1 1.64 78-1
No Tip 73.21 2-1 9.35 14-1 1.87 69-1
Page 2
DEMA BLEND CENTER
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
TABLE 2 - 4 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING
Injection Rates For Viscosities Shown
Metering Tip Color
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 ul tra lean tip kit 100-15KU or capill ary tip 44-61P.
Table 3 - 1 GPM FLOW RATE PROPORTIONER, 3/8” I.D. TUBING
Metering Tip Color
Clear 2.28 56-1 0.63 204-1 0.44 292-1
Purple 2.98 43-1 1.22 105-1 0.76 168-1
Yellow 5.18 25-1 2.51 51-1 2.01 64-1
Green 6.37 20-1 4.22 30-1 3.14 41-1
Pink 8.76 15-1 5.59 23-1 4.17 31-1
Turquoise 12.01 11-1 8.44 15-1 6.12 21-1
Black 15.16 8-1 9.93 13-1 7.09 18-1
Gray 18.97 7-1 12.55 10-1 8.73 15-1
Red 25.38 6-1 15.84 8-1 10.07 13-1
Blue 28.24 5-1 17.92 7-1 11.7 11-1
Brown 36.99 4-1 21.31 6-1 12.04 10.5-1
White 45.52 3-1 25.26 5-1 12.67 10-1
Orange 53.31 2.5-1 28.44 4.5-1 13.14 9.75-1
Li ght Blue** 60.27 2.25-1 30.5 4-1 13.51 9.5-1
Tan** 72.94 2-1 33.4 3.75-1 14 9-1
No Tip 77.90 1.75-1 35.85 3.5-1 14.5 8.75-1
3. OPERATION:
The Blend Cente r is now ready for use. Depressi ng a push b utton 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 , bu t 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 unnecess ar y 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.
4. 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:
: CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING.
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
I-796 Page 2 of 6
Rev. D-36452 5/05/11
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Page 3
DEMA BLEND CENTER
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
handling hazardous chemicals.
C. Proportioner continues to dra w chemical after water valve closes:
creating a natural siphon. Lower the supply vessel or hang up outlet tube after use.
D. Valve Malfunction:
released, indicating that the mag net 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 hole) in the
diaphragm convolution are clear to allow the valve to close.
Caution: When servic ing unit, be sure that repl acement parts have been installed according to the dr awing.
Check that the button moves freely in & out and that a "click" can be heard when the button is pushe d and
Table 4 - 4 GPM FLOW RATE PROPORTIONER, 3/8” I.D. TUBING
Injection Rates For Viscosities Shown
Metering Tip Color
Clear
Purple
Yellow
Green
Pink
Turquoise
Black
Gray
Red
Blue
Brown
White
Orange
Light Bl ue**
Tan**
No Tip
Note: All induction rates are based on a water pressure of 40 psi.
** These tips are no t included in the standard tip pack.
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
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
0.82 157-1 0.6 212-1
Chemical supply is higher than b ottom of discharge tube
RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITTEN
PERMISSION. RETURN MERCHANDISE AUTHORI ZATIO N 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-796 Page 3 of 6
Rev. D-36452 5/05/11
Page 4
DEMA BLEND CENTER
PRESSURE INDICATING TEE INSTALLATION
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
Pipe Plug & O-Ring
Vinyl Discharge Tubing
FIGURE 1
Push Button Actuator
Close Nipple
Adapter
Inlet Hose Adapter
Mounting Holes
Action Gap Assembly
Proportioner
Metering Tip
Strainer Washer
Supply Tubing
To Chemical
Push Button
Knife
FIGURE 2
Chemical Container
Ceramic Weight
Outlet Tubing
Pressure
Indicating
Tee
Chemical
Inlet Tubi ng
Foot Valve
Blend Center
Water Inlet Hose
Water Inlet Hose
I-796 Page 4 of 6
Rev. D-36452 5/05/11
DETAIL OF PRESSURE
INDICATING TEE
FIGURE 3
Page 5
DEMA BLEND CENTER
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
NO. PART NO. DESCRIPTION
1 66-139 MAG NET HOUSING
2 66-140 PUSH BUTTON
3 63-35 MAGNET
4 63-36 SPRING
5 41-7-25 ENCLOSING TUBE
6 63-87 VALVE REPAIR KIT
7 63-37 SPACER
8 41-1-8 KICKOFF SPRING
9 63-38 PLUNGER
10 41-15-10 DIAPHRAGM, EP
11 63-39 VALVE BODY
12 100-38 STRAINER WASHER
13 93-44 PIPE TO GARDEN HOSE
ADAPTOR
14 66-31 CLOSE NIPPLE
15 66-153 PIPE PLUG ASSY
16 16-30 ACTION GAP ASSY
17 61-22GAP-2 4 GPM PROPORTIONER (WHITE)
18 61-99GAP-2 1 GPM PROPORTIONER (GREEN)
NO. PART NO DESCRIPTION
19 61-21 ½” ID X 6’ LONG VINYL OUTLET
TUBE (4 GPM)
20 16-3-6 1/3” ID X 6’ LONG VINYL
OUTLET TUBE (1 GPM)
21 63-78 O-RING EP
22 63-79 INLET BARB (1/4”)
23 63-80 INLET BARB (3/8”)
24 100-15K METERING TIP KIT (1/4” BARB)
25 61-9K METERING TIP KIT (3/8” BARB)
26 100-12 ¼” ID X 8’ LONG VINYL SUPPLY
TUBING
27 61-107-2 CERAMIC WEIGHT FOR ¼”
TUBING
28 61-107 CERAMIC WEIGHT FOR 3/8”
TUBING
29 100-16E-1 FOOT VALVE
30 68-6-QD2 PRESSURE INDICATING TEE
31 61-25-2 FRESH WATER OUTLET KIT
I-796 Page 5 of 6
Rev. D-36452 5/05/11
Page 6
DEMA BLEND CENTER
MODEL 681GAP-3
INSTALLATION INSTRUCTIONS
5
1
1
2
3
NO. PART NO. DESCRIPTION
1 150-6 Rubber Washer
2 61-36 Flow Disk
3 16-3-6 1/2” I.D. x 6” Lg. Vinyl Outlet Tube (1 GPM Only)
4 61-21 1/2” I.D. x 6’ Lg. Vinyl Outlet Tube (4 GPM Only)
5 63-89-1 Rubber Washer (1/32” Thick)
6 16-30 Action Gap Assembly
4
6
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Rev. D-36452 5/05/11
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