Warrick Series 47 Part Number
The 47 Series alarm panel control module is a complete 4 channel alarm control for use with float-type (dry contact) or conductive level sensors. It is designed for applications where intrinsically safe control in hazardous locations may be required.
The general rule is the sensitivity of the control (e.g. 26K, 50K etc.) should be greater than the resistance of the liquid. The less conductive (more resistance) a liquid is, the more sensitive the control module needs to be. It is usually better to choose the sensitivity level that is above, yet as close to the conductivity/resistance as you can. Choosing a level too high could sense mist, foam, steam, etc., or even cause the module to not operate properly. Gems has offered a conductivity chart <HERE>.
Please note, if your liquid conductivity is too high for any sensitivity level listed, then you will need to consider a float-type level sensor.
The supply voltage selection is what is used to power the control module.
This option adds or removes auxiliary contact relays. Auxiliary contacts consist of four non-powered SPDT relays each dedicated to a separate channel. Each relay will change states when that specific channel is in alarm condition. This option does not affect the other alarm indication functions on the 47 series module.
Number of Probe Channels
The 47 series offers up to 4 separate channels for alarm outputs. Each channel will accept one conductive or one contact closure input for detecting liquid level. Input sensor wiring attach to S1-S4 (sensor) and G1-G4 (ground) screw terminals.