Advice on pulse output

Projects General Guidance
1

Hey fellow arduino users.
I am extremely new to the area of microcontrollers, and electronics. The project I am currently working on involves using the arduino to read a serial input every 15 mins from a stream height bubble meter. Using this information, the arduino will determine when the stream has increased at a pre-determined amount. Once this condition has been met, the arduino will send a pulse to another machine (water sampler). My question is in relation to the pulse output. The documentation for the water sampler states that it requires a 25 millisecond isolated contact between 5 and 15 volts. If my understanding is correct I should be able to connect a digital pin on the arduino to the water sampler, using the following code;

digitalWrite(pinNumber,HIGH);
delay(25);
digitalWrite(pinNumber,LOW);

The link for the about the water sampler: http://www.ierents.com/Spec%20Pages/3700c.pdf

Appreaicate any help.
Thanks.
Jason

2

"Flow Meter Signal Requirements:
5 to 15 volt DC pulse
or 25 millisecond isolated contact closure"

Your understanding seems to be correct given the limited info available on the interface.
Make sure you have the grounds connected together.
I'd be tempted to go with the isolated contact closure tho, use an optoisolator or a relay to make the contact.