Page 70 - Gas Detection Systems Training Manual

5. USER INTERFACE
User Inputs – Magnetic Switches:
The SEC3120 has three (3) magnetic switch pickups on the Display PCB. The picture below shows the locations of the magnetic switches labeled UP, DOWN and ENTER. Placing a magnet in close proximity to one of the switches will cause the following operations to occur.
Switch Operation
ENTER Enter Menu Mode, Selects a menu to Enter UP Moves up through Menu selections
DOWN Moves down through Menu selections
LED Indicators:
There are two multi-color LEDs that indicate Alarm and Fault status. The Alarm LED indicates the current alarm status individually for each sensor, regardless of the Relay Mode. The alarm state LEDs toggle indication for each sensor along with the sensor information display. When sensor one information is displayed, the alarm-state LEDs indicate the alarm status for sensor one. When sensor two’s information is displayed, the alarm-state LEDs indicate the alarm status for sensor two. The color of the Alarm LED indicates the Alarm level; Low Alarm = Yellow, Mid = Amber and High = Red. The fault state LED toggles withthesensorinformationdisplayaswell,exceptwhenaSEC3120Transmitterunitfaultexists. Infault condition, this LED is Red.
LCD Screen:
The LCD screen is a grayscale display with a 5/8 inch by 2 inch viewing area. It displays the gas type, range, measured gas concentration and status information for each sensor and the display unit. It has a contrast potentiometer that is accessible behind the faceplate on the Display PCB positioned just above the LCD display. The front faceplate must be removed to access it. This potentiometer allows the user to increase or decrease the display contrast, making it more visible under varying ambient light conditions and personal user preference.
Operator Manual Page 9 of 40 P/N 1580281 SEC3120 Digital Transmitter Sensor Electronics Corporation Rev 10, 20150707