3 Sensor / 3 Range Switch Module is a circuit board (CB) with 2 rotary switches, and 3 groups of 5-wire connectors where up to three sensors may be connected. The 3SRE will function with all Conductivity/TDS and Resistivity models, analog or digital. For ease of description, 3SRE will be used throughout, and in the following description each switch function will be described separately.

The 3 Sensor Switch allows the user to view 3 separate sensor locations and to set the alarm/control function using only one Monitor/controller. As shipped from the factory, the number (1) Sensor position is set to be the primary or the controlling sensor while the other sensor positions are monitoring ONLY. This feature disables or stops the alarm/control function from operating when changing sensors. In other words, while in the #2 or #3 position the alarm/controller is disabled NO ALARM or CONTROL. However, any of the sensor positions many be selected to control by resetting the select switches as shown on the CB and described below.

The 3 Range Switch allows the user to select which 'range' (Cond/TDS = X1, X10 or X100 / RES X1, X.1 or X.01) to view, and to set for alarm/control function. The 3R may be configured - via select switches - to disable or stop the alarm/control function from operating when changing ranges. It is available in multipliers of (10) only.

Example #1 - Conductivity/TDS: 758II-117-3R = 500 uS (X1) w/ 5000 uS (X10) & 50 mS (X100) additional ranges.

Example #2 - Resistivity: 753II-11-3R = 20 Mohm (X1) w/ 2 Mohm (X10/X.1) & 200 Kohm (X100/X.01) additional ranges.

As shipped from the factory, the number (1) Range position is the primary or the alarm/control position while the other positions are monitoring ONLY. In other words, while in the #2 (X.1) or #3 (X.01) position the alarm/controller is disabled. In the above example #2 the 20M? (X1) is the primary or alarm/control range.

NOTE: It is NOT possible to have different alarm/control settings for each sensor and range combination. The alarm/control function will always be the same as a percentage of full scale.