Weidmuller PTX800D - Scalable pulse and frequency counter - Manual (Page 13)

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Input voltages over 45 V DC
If the input voltage is above 5 V DC connect the internal high voltage
select jumper before applying the signal (maximum voltage is
50 V DC).
Digital pulse output
The basic model PTX800D has a retransmit pulse output, which gives
a single pulse every time the total increases by one unit. The pulse
width is a constant  ms and the minimum off time is  ms. The
output is an isolated, NPN, open collector transistor type and can
switch a maximum of 50 V DC or a current up to 00 mA.
Reset pulse input
Accepts a volt-free contact closure, or a shorting link, between pins 
and 1. The contact must be closed for at least 100 ms.
Alarm channels one and two (optional)
Alarm channels one and two have SPDT relay contact outputs. The
rated current decreases for inductive loads so using suppressor
capacitors is recommended.
Analogue output (optional)
The analogue output provides you with a current or voltage based
signal that is proportional to the rate or total. For rate outputs, the
average value is the same as the rate, although the instantaneous
value may differ slightly for rapidly changing signals.