Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Electrical Specifications

Pressure Volts

25 kPa (-0.75 bar) approx. 0.48
50 kPa (-0.50 bar) approx. 0.95
100 kPa (±0 bar) approx. 1.9
125 kPa (0.25 bar) approx. 2.4
150 kPa (0.50 bar) approx. 2.8
175 kPa (0.75 bar) approx. 3.3

Pressure expressed in kPa refers to absolute pressure, i.e. 100 kPa corresponds to barometric pressure. When checking the pressure sensor using a pressure/vacuum pump, slightly lower voltages may be obtained it this is done at high altitudes, 5 V power supply.