721A electronic counterDetailed product description：

The 721A electronic counter is a newly developed counter for the Chinese market based on the 721 counter from the German company HENGTLER. It uses highly integrated surface mount components, occupying a small space but providing multiple functions to meet various special usage requirements.

The 721A electronic counter adopts highly integrated surface mount components, occupying a small space.
Strong counting function, can be driven by signals such as voltage pulses, proximity switches, photoelectric switches, shaft encoders, or mechanical contact switches to count, with high counting frequency.
It can be reset by both the front panel and external electrical signals, making it easy to use.
The internal unique memory can store the count value for ten years without the need for batteries after power failure or shutdown.
5-digit red digital tube (LED) display, high clarity, easy identification, not easily affected by temperature and light.
It can be used for counting work that intermittently returns to zero, such as statistical counting, mechanical rotation, currency counting, flow counting, group selection counting, etc. It is widely used in industries such as packaging, textile, machinery, printing and dyeing.
At the same time, a four digit counter with the same function can be made according to customer needs.

Threshold voltage	High level ≥ 5 V, low level ≤ 1 V
Extreme voltage	Positive and negative 40V
Count (reset) signal frequency	30Hz or 5kHz, can be set through programming switches
Counting (reset) signal triggering method	Negative edge
Minimum pulse width	17ms or 100 μ s, can be set through programming switches
Ratio setting range	0.001-9.999
Signal output mode	relay output
Signal output time	Minimum 50ms, approximately 1s in the middle, can be set to steady state
load capacity	Relay output: 50VA, maximum voltage AC: 250V; DC：30V, Maximum current: 1A
duty cycle	1: 1
Anti interference level	Level 3 (IEC801)
Front panel protection	IP54，DIN40050
Rear panel protection	IP00，DIN40050
Operating Temperature	℃
Storage temperature	-20℃~+70℃
weight	About 220g

721A electronic counter