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Setra FLEX Operating Instructions

Phone: (800) 257-3872 | Fax: (978) 264-0292 | www.setra.com

Inputs that are on-board the FLEX main unit are labelled

“On-Board AI-1” and “On-Board UI-1 to 3,” for Analog

Input (AI) and Universal Inputs (UI) respectively. Note, if

FLEX is using a factory-installed pressure transducer, then

the input “On-Board AI-1” is not available, as it is occupied

by the on-board sensor snapped to the back of the unit.

Selectthedesiredinputtobecongured.Thendenethe

type of signal output from the sensor, milliamps (mA), DC

voltage (VDC), or contact (Digital). Selecting “None” means

the input is not used, and FLEX will not attempt to read a

transient input signal from that input.

Choose the Sensor Type being used. Pre-selections are

available for Pressure, Temperature, Humidity, and Air

Changes per Hour (ACH). A User Dened selection can

also be chosen if the sensor is not one of the ones on the

pre-selected list.

When the Sensor Type is chosen, the input signal can

then be scaled using Low and High signal values that

match the full-scale range of the applicable sensor. In the

example below, these are “mA Low” and “mA High.” This

scaling of the input allows the sensor’s output signal to be

scaled to the desired reading on the Home screen. Select

theEngineeringUnits“EngUnits”anddenethefull-scale

range of the sensor in the appropriate units of measure.

When “Digital” is chosen for Input Type, DOOR can be

selected as an option. This applies to a door contact.

Selecting Normal Polarity means switch open equals door

open, and switch closed means door closed. Selecting

Reverse Polarity means switch open equals door closed,

and switch closed means door open. Choose the Polarity

that generates the desired results from the door switch

being used.

Setra Systems Flex User Manual

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