This document introduces the features and characteristics of APEM's MEMBRANES keyboards, including maximum voltage, maximum current, contact resistance, insulation resistance, mechanical characteristics, sealing, etc.
APEM offers stainless‑steel membrane keypads and keyboards designed for harsh environments. The range includes several series (7, 70, 8P, 8Z, 9) with customizable key shapes, backlighting options, and modular construction.
The document lists detailed electrical (max voltage 24 VDC, max current 50 mA, contact resistance < 10 Ω), mechanical (contact force 0.4 N ± 0.5 N, travel 0.5 mm, 1 000 000 operations), and climatic specifications (operating temperature –20 °C to +70 °C, IP65 sealing). Backlighting options use LED colors with supply voltages of +5, +12 or +24 VDC.
| Maximum voltage | 24 VDC |
|---|---|
| Maximum current | 50 mA |
| Contact resistance | < 10 ohms |
| Dielectric strength | 250 V |
| Insulation resistance | > 100 M Ω |
| Contact force | 0.4 N ± 0.5 N |
| Contact travel | 0.5 mm |
| Operations life | 1 000 000 cycles |
| Sealing rating | IP65 |
| Operating temperature | -20 °C to +70 °C |
| Storage temperature | -40 °C to +85 °C |
| Backlit key current (8 series) | 10 to 40 mA |
| Backlit key current (9 series) | 10 to 20 mA |
The keyboards can operate up to 24 VDC.
All series are sealed to IP65.
They work from –20 °C to +70 °C.
Backlit keys draw between 10 mA and 40 mA depending on LED colour and voltage.