The Omron H7ET-NV-H Counter is a high-visibility time counter with a backlit display, ideal for low-light control panels. It measures extended time ranges up to 999999.9 hours or 3999 days 23.9 hours, ensuring accurate long-term monitoring. Supporting 4.5 to 30 VDC voltage input, it offers broad compatibility with automation equipment. Its 20 ms reset response, IP66 front protection, and excellent shock, vibration, and EMC resistance ensure stable operation in harsh environments. Manufactured by Omron and featured under Omron Counter solutions, this unit is part of the Omron H7ET Series.
Hight level: 4.5 to 30 VDC
Low level: 0 to 2 VDC (Input resistance Approx. 4.7 kΩ)
Display method
Backlit transmissive LCD
Display Digits
7 digit
External connections
Screw terminal
Counter Reset system
External and manual reset
Input mode
Voltage input
Display Character height
8.6 mm (Black)
Display Zero suppression
Equipped
Time counter ranges
Increment (UP)
counter Time ranges
0.0 h to 999999.9 h/0.0 h to 3999 d 23.9 h (selectable)
Time counter Set value read selector
±100 ppm (25 ℃)
External/Manual Reset time
20 ms
Ambient temperature (Storage)
-10 to 55 ℃ (with no freezing or condensation)
Ambient humidity (Operating)
25 to 85 %
Dielectric withstand voltage
Between current carrying terminals and exposed non-current carrying metal parts: 1000 VAC 50/60 Hz 1 min
Between backlight power terminals and timer input/reset terminals: 1000 VAC 50/60 Hz 1 min
Impulse withstand voltage
Between current carrying terminals and exposed non-current carrying metal parts: 4.5 kV
Noise immunity
Between reset terminals: ±600 V
Between backlight power terminals: ±480 V
Between timer input terminals: ±600 V
square-wave noise by noise simulator (pulse width: 100 ns/1 µs, 1-ns rise)
Static immunity
±8 kV (malfunction)
Vibration resistance
Between current carrying terminals and exposed non-current carrying metal parts: 100 MΩ min. (at 500 VDC)
Between backlight power terminals and timer input/reset terminals: 100 MΩ min. (at 500 VDC)
Shock resistance
Destruction: 300 m/s2, 3 times each in 6 directions
Malfunction: 200 m/s2, 3 times each in 6 directions
Degree of protection
Case front: IP66, NEMA 4 (indoors), and UL Type 4X (indoors)
