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MGS Installation and Operation Manual

1000-0085 Rev 0 21

Section 5. Configurations

5.1. Overview

Function Description

Time Delay

Available on the audible alarm and relay to avoid false

alarms. This is set with jumpers. The default delay is 0

minutes. You may wish to set to 15 minutes during start up.

See Figure 2 and Figure 3 for setting the jumpers.

Audible

Alarm

The units have an internal audible alarm. You can disable

this by jumper, but the default setting is “enabled” in

compliance with EN378. See Figure 2 and Figure 3 for

setting the jumpers.

Output

Decide which output is required: 4-20mA, 1-5V, 0-10V, relay

outputs, etc. See Figure 2 and Figure 3 for setting the

jumpers.

5.2. Adjusting the Alarm Set Point

This process is the same for all versions using pot P1 and test points 0V and

REF1.

Step Adjusting the Alarm Relay

Locate Pot P1 and use it to adjust the set point at which the relay

activates.

Monitor the output between test points 0V (negative) and REF1

(positive) until the correct setting is reached. See example below.

Example: For a sensor range of 0-1000 ppm, calculate the voltage to set the

relay at 100 ppm.

𝐀𝐥𝐚𝐫𝐦 𝐏𝐨𝐢𝐧𝐭 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝐀𝐥𝐚𝐫𝐦 𝐕𝐚𝐥𝐮𝐞 ×

𝟓 𝐕

𝐌𝐚𝐱 𝐑𝐚𝐧𝐠𝐞

𝐀𝐥𝐚𝐫𝐦 𝐏𝐨𝐢𝐧𝐭 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝟏𝟎𝟎 𝐩𝐩𝐦 ×

𝟓 𝐕

𝟏𝟎𝟎𝟎 𝐩𝐩𝐦

= 𝟎. 𝟓 𝐕

So the alarm voltage setting is 0.5 Volts.

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Murco MGS Specifiche Pagina 21