How to Guide

© 2011 Schneider Electric
All Rights Reserved
Commercial Pressure and Float Switches for Power Circuits
Float Switches—Class 9036, 9037, and 9038
60
03/2011
Table 22 lists the operating forces for Class 9038 Type A alternators. Use this table when selecting
additional tubing or when selecting floats and rods for accessories made by other manufacturers.
Accessory Kits
Table 23 lists the Class 9049 accessory kits for Class 9038 Type A alternators. The accessories are
ordered separately from the alternators. Order tapped-at-top floats for Type AG1 (except form C) and
center-hole floats for Types AG1C, AW1, and AR1.
When ordering float accessories, first specify the desired accessory kit, then as a second item, give the
catalog number and the quantity of the additional tubing kits required. For example, for a 9049A6C kit
with 15 ft of tubing, specify:
A. 9049A6C, quantity = 1 (includes 5 ft of tubing)
B. 9049T1, quantity = 4 (2.5 ft of tubing each, for a total of 10 additional ft)
Table 22: Class 9038 Type A Operating Forces
Catalog Number 9038AG1 9038AG1R 9038AR1/9038AW1 9038AR1R/9038AW1R
Lever Length Position Minimum Maximum Minimum Maximum Standard Standard
Force Up to Trip (oz), without Form C
[1]
18 16 14 11 — —
Force Down to Trip (oz), without Form C
[1]
20 17 16 12 — —
Maximum Rod Length Supported
by the Compensating Spring
ft (m)
[2]
Brass 10 (3.05) 8 (2.44) 7 (2.13) 6 (1.83) 16 (4.88) 19 (5.79)
Stainless Steel 12 (3.66) 10 (3.05) 8 (2.44) 7 (2.13) 20 (6.1) 23 (7.01)
Aluminum 25 (7.62) 21 (6.4) 17 (5.18) 15 (4.57) 41 (12.5) 47 (14.33)
Maximum Weight of Tubing and Stops
Supported by the Compensating Spring (oz)
47 41 33 30 74 85
1
Add 2 oz for high water alarm (Form N5 or N25).
2
Rod length determined using Class 9049 rod material (0.38 in. / 10 mm O.D. tubing).
Other types of rod must be weighed and compared to the “Maximum Weight of Tubing and Stops” row above.
Table 23: Class 9049 Accessories for Class 9038 Type A Float Switches (weight in oz)
Accessory Kits Tapped-at-Top Floats (#304 SS) Center-Hole Floats (#304 SS) Additional Tubing
[1]
Catalog Numbers
9049A6 9049A6A 9049A6S 9049A6C 9049A6CA 9049A6CS 9049T1 9049T1A 9049T1S
Tubing 5 ft brass 5 ft Al 5 ft SS 5 ft brass 5 ft Al 5 ft SS 2.5 ft brass 2.5 ft Al 2.5 ft SS
Net buoyancy in water, 7 in. float
[2]
60 60 60 70 70 70 — — —
Total weight of stops 3 3 3 6 6 6 — — —
Number of stops 222444———
Weight of 5 ft rod, included 18.5 6 16.9 18.5 6 16.9 — — —
Weight per ft of extra rod — — — — — — 3.7 1.2 3.4
1
Additional tubing kits add on to the float accessory kits and include a connector. Maximum recommended tubing length for tapped-at-top float: 12.5 ft (3810 mm).
2
Net buoyancy calculated with float 80% submerged, allowing for a 20% operating margin. Buoyancy data calculated for use in water. Contact the Sensor
Competency Center for buoyancy data in media having specific gravity different than water (1.0).
Figure 18: Type AG1 Dimensions Figure 19: Type AR1/AW1 Dimensions
6.88
175
2.06
52
3
76
1.13
76
3.63
92
4.69
119
1.06
27
0.84
21
1.75
44
3.5
89
4.19
106
5.38
137
0.75
19
2
3
0.28
7
Dia.
4 Mtg.
Holes
4 knockouts for
0.5 to 0.75 Conduit
1
Position:
to
1.47
37
4.5
114
6.86
174
2.91
74
0.44
11
0.06
2
1.69
43
1.25
32
4.75
121
0.75
19
7.13
181
8.35
212
5.35
136
5.88
149
1.03
26
4.16
106
C
L
3/4-14
Pipe Tap
3/4-14
Pipe Tap
1.50
38
2.31
59
Approx.
Pos. 2
Pos. 1
Pos. 3
Mtg.
Hole
Dia.