APG NLS Pneumatic user manual - Manual (Page 6)

NLS Series Rev. A1, 4/07
6
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Notes:
• When the liquid is not SG = 1.0, divide the switch operating position or
switch release position with the actual SG.
Example: NLS-1A for SG = 0.8
Switch operating position: 80/0.8 = 100 mm
Switch release position: 60/0.8 = 75 mm
• When the detecting pipe is wider than 1/2 in., the switch operating
position drops.
To ensure proper operation, the following steps should be followed:
• Determine switch operation:
High level operation
Low level operation
• Determine where the actuation level should be:
Distances are measured from the inner surfaces of the mounting plug to
the end (inlet) of the detecting pipe.
For high level operation:
[actuation level] = [switch operating position] + 20 mm (screw length)
For low level operation:
[actuation level] = [switch release position] + 20 mm (screw length)
For example, consider a type NLS-1A needing 200 mm actuation levels
(low and high):
The pipe must be 300 mm for high level operations.
200 mm + 80 mm + 20 mm = 300 mm
The pipe must be 280 mm for low level operation.
200 mm + 60 mm + 20 mm = 280 mm
• Select the proper material which is compatible with the liquid.
• Install the detecting pipe into the R 1/2 in. coupling of the NLS. This is
coupling must be airtight to insure reliable operation. Use a paste form
sealing compound on the coupling.
• Make sure the diaphragm is mounted in horizontal alignment.