How to Guide

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Commercial Pressure and Float Switches for Power Circuits
Float Switches—Class 9036, 9037, and 9038
50
03/2011
Table 12 lists the trip forces and compensating spring requirements for Class 9036 Type D and G float
switches. The trip force can be adjusted on the Type G switches by changing the lever length position.
Figure 3: Lever Length
Table 13 lists Class 9049 accessory kits, which are ordered separately from Class 9036 Type D and G
float switches. A float kit is required; a tubing kit and replacement float do not provide all needed parts.
When ordering, first specify the desired accessory kit, then as a second item give the number of
additional tubing kits required. For example, to get 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)
Example
Table 12: Maximum Trip Forces for Class 9036 Float Switches
Class 9036 Type and Form DG2 DG2R DW31 DW31R DR31 DR31R GG2 GG2R GR1, GW1
Lever Length Position — — — — — — Short Long Short Long Short Medium Long
Force Up to Trip (oz) 9 8 8 8 8 8 3321302224 22 20
Force Down to Trip (oz) 8 8 8 8 8 8 3927241631 29 27
Maximum
Supported
Weight (oz)
Without Compensating Spring 6 4 5 5 5 5 2513181119 17 16
With Compensating Spring 60 60 66 66 66 66
[1]
100
[1]
150 80 72 64
1
The compensating spring is not effective in combination with short lever length position.
Long
Short
AB
AB
AB
AB
Medium
NOTE: Holes should be aligned as shown
to adjust for the desired length.
Table 13: Class 9049 Accessories for Class 9036 Type D and G Float Switches (weight in oz)
Accessory Kits Tapped-at-Top Floats (#304 SS) Center-Hole Floats (#304 SS)
[1]
Additional Tubing (#303 SS)
[2]
Used on Class 9036 Float Switch Types All Except GW, GR, and Form C GW, GR, and Form C All
Catalog Number 9049A6 9049A6A 9049A6S 9049A6C 9049A6CA 9049A6CS 9049T1 9049T1A 9049T1S
Tubing (rod) 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
[3]
60 60 60 70 70 70 — — —
Combined 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 3.7 1.2 3.4 3.7 1.2 3.4
1
Require the use of the 9049A6, 9049A6A, or 9049A6S kit. The additional tubing only attaches to other lengths of tubing.
2
Additional tubing kits add on to the float accessory kits and include a connector.
Maximum recommended tubing length: Tapped-at-top float: 12.5 ft (3810 mm); Center-hole float: 30 ft (9144 mm).
3
Net buoyancy calculated with float 80% submerged, allowing for a 20% operating margin. Buoyancy data calculated for use in water. Consult the Sensor
Competency Center for buoyancy data in media having specific gravity different than water (1.0).
Calculation example
Measuring 15 ft of tank depth
System has 15 ft of brass rod, 4 stops, and a
center hole float.
Buoyancy is positive, so no compensating
spring is required
Float buoyancy 70.0 oz
Total weight (61.5 oz)
Weight of stops: (6.0 oz)
Weight of 5 ft of brass rod (included): (18.5 oz)
Weight of 10 ft of brass rod (separate): (37.0 oz)
Buoyancy 8.5 oz