KMC Controls SAE-1152(OLD Style Board w/ LEDs) - Manual (Page 4)

Start-Up
1. Verify that the Carbon Monoxide Transmitter is proplerly wired and all connections are tight.
2. Apply power. A 200 second warm-up period will begin. The five LEDs will indicate this period
by cycling one light at a time.
Operation
The five LEDs are scaled to indicate 100, 150, 200, 250 and 300 ppm.
Example:
If the CO level is 175 ppm then LEDs D9 and D10 will be lit to indicate the ppm level is
more than 150 and less than 200 ppm. The measurement range for the electrochemical
sensor is 0 to 500 ppm (standard) or 0 to 250 ppm (optional) and the five LEDs are scaled
either 100, 200, 300, 400 and 500 ppm or 50, 100, 150, 200 and 250 ppm.
The analog output is proportional to the measured concentration of CO. The signal type
must be selected during installation via two jumpers on the PCB. One jumper selects either
4-20 mA active, 4-20 mA passive or voltage output and if voltage is selected than the other
jumper determines the full scale value as either 5 or 10 VDC.
Two optional relays are used to indicate alarm conditions. The trip point, hysteresis and delay time
of each relay can be programmed.
Example:
The first relay defaults to 50 ppm trip point, 10 ppm hysteresis and 2 minute delay time. All
of these values can be changed via the menu. In this case a timer is started when the CO
level exceeds 50 ppm (the trip level). If the level drops below 50 ppm before 2 minutes (the
delay time) has expired then the relay is not activated. If the CO level exceeds 50 ppm for 2
minutes then the relay is activated.
The relay will remain activated until the CO level drops below 40 ppm (trip level –
hysteresis). This relay can be used to signal a “low alarm”. The second relay operates in the
same manner and has independently programmable trip point, hysteresis and delay time.
This relay can be used to signal a “high alarm”.
The optional buzzer trip point and delay time can be programmed similarly to the relays to
indicate an alarm condition. When the trip point is exceeded for a time longer than the
delay time, then the buzzer will sound until the CO level falls below the trip point. The
buzzer can be disabled by moving the “Buzzer” jumper to the OFF position.