MAC MAC155L - Overview; General

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OVERVIEW

GENERAL

Always maintain AC power to the MAC155 Probe when the probe is

in place in the instrument port and the monitored equipment is

operating, (generating typical moisture).

There are no operator serviceable parts inside The MAC155 Probe

or Controller. Removal of the cover will increase the risk of electric

shock and contact of surfaces that can cause burns. Only trained

personnel familiar with this type of equipment and the hazards

involved should remove the covers.

The MAC155 is intended for use in continuously monitoring the water vapor

level in a stack or duct.

The MAC155 consists of two parts; a probe that mounts to a port on the stack

or duct that is being monitored, and a controller which is typically located in a

control room.

The MAC155 has multiple ranges which are user selectable using the display

and pushbuttons on the controller. It is necessary to do a calibration

sequence if the range is changed. The unit is shipped preset and calibrated to

the range indicated on the order. Refer to the blue factory configuration sheet

that was shipped with the unit for range information.

The MAC155 controller supplies AC and DC power to the probe. The probe

and controller communicate via an isolated RS485 serial port.

The % moisture level is displayed on the controller front panel and is

available as a 4–20ma or a 0–20mA analog signal at the rear of the controller.

4mA or 0mA represents 0% moisture by volume (MBV) and 20mA represents

100% MBV. The analog output can be forced to 0%, 25%, 50% 75% and 100%

of full scale using the pushbuttons on the front of the controller. This allows

testing of data logging equipment.