822-1000-C00 Datasheet, PDF (2/8 Pages) Magnetrol International, Inc. – Kotron® Sentinel Models 822, 832 and 842 RF Point Level Switches

TECHNOLOGY
The amount of capacitance developed in any vessel is
determined by the size (surface area) of the probe, the
distance from the probe to its ground reference, and the
dielectric constant of the medium being measured.
Considering that the probe’s mounting position is fixed
and the dielectric of the medium is constant, then the
amount of capacitance developed in any vessel becomes
dependent upon the amount of the probe which is
covered by the media.
As the media rises and falls in the tank, the amount of
capacitance developed between the probe and the
ground reference also changes. The capacitance signal is
converted to a frequency proportional to the change in
level. The amplifier then converts this digital signal into
an isolated 4–20 mA analog output signal.
SPECIFICATIONS
Supply voltage
Power consumption
Humidity
Electrostatic discharge protection
Response time
Ambient temperature
Temperature coefficient of set point
Maximum remote mount distance:
Standard
Intrinsically safe
Data:
Entry
Indication
Relays 2 to 4 DPDT:
AC
DC
Set point range
Differential range
Time delay
120 VAC, 50/60 Hz (+10/-15%)
240 VAC, 50/60 Hz (+10/-15%)
24 VDC (±10%)
15 VA nominal
99% non-condensing (electronics)
Per IEC specification 801-2
70 ms to approximately 2 seconds, depending upon probe
capacitance and averaging value
-40° to +160° F (-40° to +70° C)
±0.01%/degree F (±0.018%/degree C)
2500 feet (760 meters)
800 feet (240 meters)
3-button keypad
4-digit LED, 1 overflow LED for +10,000
10 amp @ 120/240 VAC resistive
10 amp @ 30 VDC resistive, 0.5 amp @ 125 VDC resistive
0–50,000 pF
0.50 pF minimum / 50,000 pF maximum
0–90 seconds level rising, falling, both
2