keep the number of XXX to

[Netta]

Затрудняюсь с концом последнего предложения. Не пойму, сколько должно быть этих термопар (**keep the number of non-operational exhaust thermocouples to a maximum of two but no more than one of any three adjacent thermocouples**).

Operating a turbine with non-operational exhaust thermocouples increases the risk of turbine overfiring and prevents diagnosis of combustion problems by use of temperature differential.
To prevent the above described malfunctions the operator should keep the number of non-operational exhaust thermocouples to a maximum of two but no more than one of any three adjacent thermocouples.

Спасибо!

[lisulya]

there shouldn't be more than two BUT if there are three in a row, then only one