Page 1
DEMA ADJUSTABLE SINGLE STAGE INJECTORS
MODELS 202B, 202BP, 202 BT, 203B, 203BP, 203 BT, 204B, 204BP, 204 BT, 206B, 206BP, 206BT
FIGURE 1
FINE METERING
ADJUSTMENT
SCREW
METERING TIP
(AS REQD.)
Model 206 B
3.60 - 11.00
4.20 - 13.00
5.30 - 17.00
6.20 - 19.00
7.70 - 24.00
11.00 - 33.00
15.00 - 46.00
17.00 - 51.00
20.00 - 60.00
23.00 - 70.00
28.00 - 87.00
33.00 - 100.00
40.00 - 100.00
1. PARTS
A. Injector
B. Ceramic Weight.
C. Plastic tubing 8' long with foot strainer.
2. INSTALLATION
The injector may be installed in any position in the water line with
the arrow in the direction of flow. Drop end of plastic tubing with
strainer into fluid product container. Cut tubing to convenient
length, and slip open end over injector fitting.
3. OPERATION
Warning: Use care when handling hazardous chemicals.
Note: The injector will not operate if the input water temperature exceeds 160 degrees F.
See Fig. 1 for location of water bypass screw and fine metering adjustment screw. Turn on water supply valve. The
injector may draw momentarily as the system is filling but normally will stop as the system builds up to full pressure.
To actuate injector, turn the bypass screw clockwise until product begins to be drawn from the container. After the
fluid reaches the injector, the feed rate may be adjust ed to the desired rate by turning the bypass screw. The maximum
injection rates are shown in Table 2. For low injection rates, it is advisable to set the bypass screw for more injection
than required; then turn the fine metering screw clockwise to reduce injection to the desired rate. Table 1 shows the
operation range of the injector. If the injector will not draw with the bypass scre w full in, t hen the wat er flow is below
the range of the injector. If the injector draws with the screw full out but pressure loss is excessive, then flow is above
the range of the injector. Table 3 shows the injection rates for models 202 BT, 203 BT, 204 BT, and 206 BT using
metering tips at various viscosities. Table 4 shows the appropriate pipe size used for each injector.
Water Pressure (psi)
10
20
40
60
100
200
400
500
* 700
* 1000
* 1500
* 2000
* 3000
* SPECIFY – S Stainless Steel Knob – Part No. 24-32S or Part No. 24-32ST (for tips) for pressure exceeding 700 PSI.
INSTALLATION INSTRUCTIONS
WATER BY-PASS SCREW
TABLE 1
Operating Range - Gallons Per Minute
Model 202 B Model 203 B Model 204 B
0.25 - 2.00 0.50 - 3.50 2.00 - 6.40
0.30 - 2.30 0.55 - 4.40 2.30 - 7.50
0.37 - 2.90 0.70 - 5.40 2.90 - 9.50
0.43 - 3.40 0.80 - 6.40 3.40 - 11.00
0.54 - 4.20 1.00 - 8.00 4.20 - 14.00
0.73 - 5.70 1.40 - 11.00 5.70 - 19.00
1.00 - 7.90 1.90 - 15.00 7.90 - 26.00
1.20 - 8.90 2.10 - 17.00 8.90 - 29.00
1.40 - 11.00 2.50 - 20.00 11.00 - 35.00
1.60 - 13.00 3.00 - 23.00 13.00 - 41.00
2.00 - 16.00 3.50 - 28.00 16.00 - 50.00
2.20 - 18.00 4.70 - 37.00 18.00 - 58.00
2.70 - 20.00 5.00 - 45.00 20.00 - 70.00
I-119 Pg. 1 of 4
Rev. C-39817 5/20/14
Page 2
DEMA ADJUSTABLE SINGLE STAGE INJECTORS
MODELS 202B, 202BP, 202 BT, 203B, 203BP, 203 BT, 204B, 204BP, 204 BT, 206B, 206BP, 206BT
Model 206 B
206BT
Fluid Viscosity (cps)
1
75
200
INSTALLATION INSTRUCTIONS
Model 202 B Model 203 B Model 204 B
8 16 40 48
5 8 8 9
3 4 4 4
202BT 203BT
TABLE 2
Maximum Injection (Oz/Min)
TABLE 3
204BT
Metering Tip
Color
Tan
Orange
Turquoise
Pink
Clear
Brown
Red
White
Green
Blue
Yellow
Black
Purple
Gray
No Tip
Injection Rates (Oz/Min)
Viscosity (cps) Viscosity (cps) Viscosity (cps) Viscosity (cps)
1.0
1.5
1.8
2.5
3.3
3.2
4.2
4.8
5.2
6.2
7.0
7.1
7.4
7.8
7.9
1
1.0
1.2
1.4
2.0
2.7
2.9
3.0
3.5
3.7
4.0
4.3
4.4
4.6
4.7
4.7
75
200
0.6
0.7
1.2
1.4
1.7
1.9
2.1
2.1
2.3
2.4
2.7
2.8
2.9
3.1
3.3
1 75 200 1 75 200 1 75 200
1.1 0.8 0.5 1.1 0.8 0.5 1.0 0.7 0.6
1.4 1.0 0.7 1.4 0.9 0.6 1.4 1.0 0.8
2.0 1.4 1.0 1.9 1.2 0.9 1.9 1.3 1.0
2.7 1.8 1.3 2.6 1.7 1.3 2.6 1.8 1.3
3.5 2.4 1.6 3.4 2.4 1.6 3.5 2.3 1.7
4.0 2.7 1.7 4.0 2.4 1.9 4.0 2.6 1.8
4.9 3.3 2.0 4.9 2.9 2.2 5.0 3.1 2.0
5.9 3.9 2.3 6.0 3.4 2.4 6.2 3.7 2.4
6.5 4.4 2.5 6.8 3.8 2.5 7.1 4.1 2.6
7.2 4.9 2.7 8.4 4.3 3.1 8.9 4.8 2.9
9 5.9 2.9 13.1 5.2 3.4 13.5 5.9 3.2
12 6.7 3.0 18.2 6.1 3.5 20.1 6.7 3.5
14 6.7 3.1 27.5 6.8 3.5 31.3 7.5 3.6
15 7.1 3.3 32.9 7.0 3.5 38.3 8.0 3.8
16 8.0 3.7 39.8 7.9 3.7 48.1 9.2 4.4
I-119 Pg. 2 of 4
All induction rates are based on a water inlet pressure of 40 psi and operating at a full vacuum.
Rev. C-39817 5/20/14
Page 3
DEMA ADJUSTABLE SINGLE STAGE INJECTORS
MODELS 202B, 202BP, 202 BT, 203B, 203BP, 203 BT, 204B, 204BP, 204 BT, 206B, 206BP, 206BT
INSTALLATION INSTRUCTIONS
Model Pipe Size
202 B 3/8 NPT
203 B 3/8 NPT
204 B 1/2 NPT
206 B 3/4 NPT
4. SERVICING
CAUTION: Turn off water supply before servicing.
The check valve parts are in the metering knob and can be cleaned by removing the four screws. The knob may be rotated
if it is more convenient to have the adjusting screw on another side of the injector. As with any injector, if spray jets
become clogged or downstream restriction increases in any manner, the injector will stop drawing fluid. If it is
inconvenient to remove the restriction immediately, the injector may be put back into operation by turning the water
bypass screw further clockwise; this adjusts the injector to the lower flow rate. The bypass screw should be reset once the
restriction is removed.
CAUTION: When servicing, make sure that replacement parts have been installed according to drawing. Be
certain to check valve parts are in place.
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.
TABLE 4
I-119 Pg. 3 of 4
Rev. C-39817 5/20/14
Page 4
DEMA ADJUSTABLE SINGLE STAGE INJECTORS
MODELS 202B, 202BP, 202 BT, 203B, 203BP, 203 BT, 204B, 204BP, 204 BT, 206B, 206BP, 206BT
INSTALLATION INSTRUCTIONS
MODEL #'S MAY ALSO INCLUDE S, E, C AND/OR -2.
1
MODEL
202B
202BP
202BT
MODEL
203B
203BP
203BT
MODEL
204B
204BP
204BT
MODEL
206B
206BP
206BT
18
?
2
7
8
10
11
9
12
13
14
3
(STAINLESS)
4
5
(STAINLESS WITH TIPS)
(TIPS)
6
15
19
21
22
2320 26
24
25
16
27
28
29
17
NO. PART NO. DESCRIPTION
1 24-33 Screw #8-32 x 7/8” Lg. (4-Reqd.)
2 24-32 Metering Knob Assy.
3 24-32PS Metering Knob Assy.
4 24-32S Metering Knob Assy. (Stainless)
5 24-32ST
Metering Knob Assy. (Stainless Steel
with Tips
6 24-32T Metering Knob Assy. (Tips)
7 100-24 Metering Screw
100-24PS Metering Screw (-BP Injectors)
8
24-25 Check Valve O-Ring (EP)
9
10 24-24P
11 24-24S
12 24-23
13 24-3414 25-29
15 100-12
16 61-107-2
17 24-11P
Check Valve Ball (Teflon)
Check Valve Ball (Stainless)
Check Valve Spring
Check Valve Core (Specify Model
No.)
O-Ring (EP)
Vinyl Tubing (3/8” OD x 8’ Lg.)
Ceramic Weight (1/4” ID 3/8” OD
Tubing
Foot Strainer
NO. PART NO. DESCRIPTION
USED ON 202B, 202BP, 202BT
18 24-48 By-Pass Screw Retainer
19 24-49 O-Ring (Buna) (3/16x5/16x1/16)
20 24-47 By -Pass Screw
USED ON 203B, 203BP, 203BT
21 24-36 By-Pass Screw Retainer
22 24-25 O-Ring (EP) (7/32x11/32x1/16)
23 24-35 By-Pass Screw
USED ON 204B, 204BP, 204BT
24 24-40 By-Pass Screw Retainer
25 26-17 O-Ring (Buna) (3/4x7/8x1/16)
26 24-39 By -Pass Screw
USED ON 206B, 206BP, 206BT
27 24-38 By-Pass Screw Retainer
28 25-29 O-Ring (EP) (3/8x1/2x1/16)
29 24-37 By-Pass Screw
ACCESSORIES
NO. PART NO. DESCRIPTION
30 100-15- Metering Tip (Specify Color)
31 100-15K Metering Tip Kit
I-119 Pg. 4 of 4
Rev. C-39817 5/20/14
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