Gems SureSite series User Manual

Bulletin No.177664-2
Rev. D
SureSite
®
Magnetic Liquid Level Indicator
Installation, Operation and Maintenance
Section 2: Switches
Operation
The SureSite Switch Module, available for use with the SureSite Magnetic Liquid Level Indicator, is a sealed assembly
containing a magnetically actuated “latching-reed” switch assembly. The reed switch is actuated by the movement of
the magnet contained in the SureSite float. The design of the reed switch permits the switch module to perform as
either a “normally open” or “normally closed” switch. When installed with the lead wires (or junction box) installed at
the top, the switch module is “normally open” and the reed switch will close with the rising fluid level in the tank;
remaining closed until a falling fluid level in the tank causes the float to drop below the indicating position, opening the
reed switch. When installed with the lead wires (or junction box) at the bottom, the switch module is “normally closed”
and the reed switch will open with the rising fluid level in the tank, and remain open until a falling fluid level in the tank
causes the float to drop below the indicating position, closing the reed switch. (See sketches below)
For electrical schematics of the switch module, please refer to the Wiring Diagrams, located on pages 5 and 6.
Installation
General: The SureSite switch module must be mounted 180° opposite the flag assembly of the SureSite Magnetic
Level Indicator and within its operating range. The installation of the switch module varies, depending on the switch
module housing and the type of SureSite Magnetic Level Indicator. The chart on the next page is intended to provide
an overview of the various switch modules and to indicate which diagram(s) should be referred to for installation
instructions.
- Normally Open Operation - - Normally Closed Operation -
Lead Wires and Junction Box Positioned at Top
Lead Wires and Junction Box Positioned at Bottom
Note: Do not use external magnet to test switch modules. Only use a Gems SureSite float assembly.

Gems SureSite series Specifications

General

Brand	Gems
Model	SureSite series
Category	Switch
Language	English

Summary

Operation

SureSite Switch Module Operation

Explains the magnetically actuated latching-reed switch mechanism for SureSite indicators.

Normally Open Operation

Describes the switch behavior when wired for Normally Open (N.O.) operation.

Normally Closed Operation

Describes the switch behavior when wired for Normally Closed (N.C.) operation.

Installation and Specifications

Switch Module Part Numbers & Specs

Lists part numbers, ratings, temperature limits, and materials for switch modules.

Mounting Hardware Options

Describes the various mounting hardware components and their use.

Mounting Diagrams

Standard SureSite Mounting Guide

Step-by-step instructions for mounting switch modules on Standard SureSite indicators.

Mini SureSite Mounting Guide

Step-by-step instructions for mounting switch modules on Mini SureSite indicators.

Mounting Diagrams (Cont.)

Alloy SureSite Mounting Guide

Step-by-step instructions for mounting switch modules on Alloy SureSite indicators.

Plastic SureSite Mounting Guide

Step-by-step instructions for mounting switch modules on Plastic SureSite indicators.

Wiring Diagrams

Basic SPST Switch Wiring

Schematics for single-pole, single-throw (SPST) switches in N.O. or N.C. configurations.

High/Low Voltage SPST Wiring

Schematics for 120 VAC and 24 VDC SPST switches with multiple wire colors.

SPDT and Special SPST Wiring

Schematics for single-pole, double-throw (SPDT) and specialized SPST switches.

Switch Module Troubleshooting

Troubleshooting Switch Operation

Provides solutions for intermittent, not switching, or always open/closed switch issues.