2 LiquidWatch Installation
8
2.5 Intrinsically Safe - UL/CUL
LiquidWatch LW64-IS is Listed by Underwriters Laboratories, Inc., for use in ordinary locations. LW64-IS
provides intrinsically safe output circuits for use in Class 1, Division 1, Groups C and D hazardous
locations when used with LiquidWatch sensor probes and installed in accordance with the instructions in
this manual. Refer to Section 3.1 for specific probe UL requirements. Also, refer to LiquidWatch control
drawing, Figure 4, for intrinsic safety requirements.
THE MAXIMUM OPERATING VOLTAGE ALLOWED IN THE LIQUIDWATCH PANEL IS 250 VAC. IN
ADDITION, THE VOLTAGE ON ANY WIRES TO THE CONTROL RELAYS MUST BE LIMITED TO 250
VAC.
The partition (cage) must be installed over the intrinsically safe barrier and internal probe board before
operating the system.
Figure 4
LiquidWatch Control Drawing
2.6 FCC
The user is cautioned that any changes or modifications, not expressly approved by the party
responsible for FCC compliance, could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and if not installed and used in
accordance with this instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
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