General
Type of electric connection	Screw connection
Number of inputs for electrodes	3
Min. adjustable operate delay time	0
Max. permitted operate delay time	0
Min. adjustable off-delay time	0
Max. permitted off-delay time	0
Number of contacts as normally closed contact	1
Number of contacts as normally open contact	1
Number of contacts as change-over contact	1
Physical measurement principle	Conductive
Width	22.5
Height	85.6
Depth	103.7
Operating voltage at AC 50 Hz	230
Operating voltage at AC 60 Hz	230
Rated switch current	4
Supply voltage AC 50 Hz	240
Supply voltage AC 60 Hz	240
Supply voltage DC	240
Voltage type (operating voltage)	AC
Voltage type of supply voltage	AC/DC
With detachable clamps
Response value sensitivity adjustable
Cascadable

The CM-ENS.21S is a relay from the CM family for level monitoring and level control. The rated control supply voltage is 24 - 240 V AC/DC. Output: 1 changeover contact (250 V / 4A). It monitors and controls levels and mixing ratios of conductive liquids. It is used for filling and emptying applications, for dry-run protection of pumps and for signaling the status of the monitored level. The operating principle and sensitivity can be set using potentiometers on the front. Various electrodes and a sealable transparent cover to protect against unauthorized adjustment of the settings are available as accessories. The device is available with double-chamber box screw terminals or push-in terminals.