Elk M1 and the GRI 2800 5VDC Liquid Detection Sensors

[ultrajones]

I have few question regarding the GRI 2800 5VDC Liquid Detection Sensor and the ELk M1 zone connection:

1) Does anyone know if the GRI 2800 5VDC Liquid Detection Sensors is suitable for installing in a sump pump pit to determine if a sump pump fails? It is unclear if these sensors can handle being submerged in water more than a few times ....

2) I want to connect about 3 of these up to my Elk M1 Gold. I assume I just connect the red wire from the sensor to the 2200 Ohm EOL, then to the zone input and the black wire to the zone "Neg"?

3) Anyone know how to test for 5 volts and under what condition (e.g. test when the sensors are detecting water)? I have a multi-meter, I just wasn't sure when I need to test for at least 5 volts.

Regards,
Ultrajones

 

[Spanky]

2800 OPEN LOOP SPECIFICATIONS:
Power Requirements:
Operating Voltage (min./max.) 5-24 Volts DC
Standby Current (at max. voltage) 10 uA
Alarm Current (max.) 400 mA
Wire Contacts:
Red Wire +5-24 Volts DC
Black Wire - Ground
Contact Characteristics:
Contacts Normally Open

The M1 provides 7 VDC across the zone inputs with a 2200 ohm EOL Resistor connected in series with the zone input.

When the 2800 senses water, it is not clear if it must still have 5 VDC provided to the power inputs. If the the 2800 shorts its input wires internally, the voltage provided to the 2800 will drop below 5 VDC.

The 2600 uses 12 VDC and a separate zone trip circuit.

 

[Sacedog]

So the 2800 runs off of 2-wire, and the 2600 runs off of 4-wire. That's good to know, as I am trying to fianlize my wiring plan. I was planning on using 2600s, connected to an expander and a PD9.

I read through the specs on the GRI water sensors. I don't think submersing them would be a problem, unless it was for long periods of time. Unfortunately, that might a question best asked directly from GRI.

 

[Sacedog]

You might want to consider a switch specifically built for a sump pump, like the following:

http://www.alarmsystemstore.com/Sump-pump-...h-p/cs2029w.htm

 

[mtwalsh367]

I tried the 2 wire 5V 2800 and had inconsistent results once a sensor triggered. I think maybe I was seeing a voltage drop once the sensor triggered and it may have been too low for the sensor to properly reset itself after detecting water. It could have also been a bad sensor but I didn't want to mess around with false alarms so I spent a little more and got the 4 wire 2600. I have 4 of these installed and have tested them a number of times. They work great.

 

[aehusted]

You might want to consider a switch specifically built for a sump pump, like the following:

http://www.alarmsystemstore.com/Sump-pump-...h-p/cs2029w.htm

Thanks for the link. I was looking for one of these!