By using an external relay block, the negative pressure monitor can activate or deactivate a negative pressure machine. Only to be used for the first channel.
An extra negative pressure machine may be necessary to stabilise the negative pressure in projects. Airtocheck offers an external relay block that will enable the monitor to switch this negative pressure machine on and off. The relay will be connected to the monitor.
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External relay block specifications
| Circuit: | Max. 16Amp |
| Cable length: | 3 metres |
| IP score: | IP45 |
| Indicator switched ON / OFF |