Kotron
®
Sentinel
Models 822, 832 and 842
RF Point Level Switches
D E S C R I P T I O N
The Sentinel is a powerful multi-point level switch. The
microprocessor-based circuitry has non-volatile memory,
to protect against data loss. Powerful diagnostics check
all major aspects of the system while MagneCal™ offers
the user the advantage that one small level change is
needed to calibrate.
F E A T U R E S
•
Optional intrinsically safe probe circuitry (with
on-board barriers) allows safe use, even with bare
probes in hazardous media
•
Intrinsically safe remote mount models up to
800 feet (240 meters) of cable
•
Integral or standard remote mount up to
2500 feet (760 meters) for application flexibility
•
Two to four DPDT relays yield wide application
flexibility for most alarm and control operation
•
Relays 2 and 3, Series 832/842 models, may be used
for lead/lag pump sequencing
•
Time delay eliminates relay chatter due to turbulence.
•
Usable with all Kotron probes for excellent application
flexibility
•
3-button/4-digit LED data entry of all parameters
•
One small level change (2% of span) needed for initial
calibration in most cases
•
Powerful self-diagnostics check the system, minimizing
the need for routine maintenance checks
•
Diagnostics check the integrity of the probe
•
One relay may be dedicated as a diagnostic alarm
A P P L I C A T I O N S
•
Hydrocarbons and solvents
•
Corrosives
•
High temperature/pressure liquids
•
Multi-point alarm/control
•
Pump control
•
Lead/Lag pump control
•
Process temperatures up to +1000° F
•
Process pressures up to 5000 psig
T E C H N O L O G Y
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.
S P E C I F I C A T I O N S
Supply voltage
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
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
2
T Y P I C A L
A P P L I C A T I O N
The following sump application displays the
extraordinary power and simplified calibration
of the Kotron Sentinel with MagneCal. To better
understand how this calibration is achieved,
consider the approach in two steps:
High
level
alarm
Probe can be calibrated
in one level change and
level movement as little
as 2% of tank height
Pump
#2
Pump
#1
Low
level
alarm
Step 1
Probe calibration
All RF Capacitance devices must be calibrated in the
process vessel. To calibrate, the process level must be
varied to achieve a capacitance change.
With MagneCal, the probe is calibrated by establishing
only two reference points and storing the data in the
microprocessor, via the 4-digit LED and 3-button keypad.
With conventional electronics, the level would need to be
varied multiple times.
Step 2
Relay configuration
The relays are now configured with no further level
change required.
The Sentinel draws upon the reference data stored during
the probe calibration.
The relay control points are easily entered via the same
4-digit LED and 3-button keypad. All relays can be cali-
brated and recalibrated without further level change.
Relays can be set up for lead/lag operation to enable
even pump wear.
3
A G E N C Y
Agency
FM
A P P R O V A L S
Protection Method
Explosion proof
Area Classification
Class
I
Div. 1, Groups C & D
Class
II
Div. 1, Groups E, F & G
NEMA 4X, IP65
Electronics:
Class
I
Div. 1, Groups C & D
Class
II
Div. 1, Groups E, F & G
NEMA 4X, IP65
Probe:
Class
I, II, III,
Div. 1,
Groups A, B, C, D, E, F & G
NEMA 4X, IP65
Approved Model
8X2-1X02-G0X
8X2-1X03-G0X
with rigid insulated probe
8X2-1X05-G0X
8X2-1X06-G0X
Explosion proof
with intrinsically safe
probe circuit
8X2-1X02-R0X
8X2-1X03-R0X
8X2-1X03-Y0X
with rigid insulated probe
8X2-1X05-R0X
8X2-1X06-R0X
8X2-1X06-Y0X
Explosion proof
Class
I
Div. 1, Groups B, C & D
Class
II
Div. 1, Groups E, F & G
NEMA 4X, IP65
Electronics:
Class
I,
Div. 1, Groups B, C & D
Class
II,
Div. 1, Groups E, F & G
NEMA 4X, IP65
Probe:
Class
I, II, III,
Div. 1,
Groups A, B, C, D, E, F & G
NEMA 4X, IP65
Explosion proof
with intrinsically safe
probe circuit
CSA
8X2-1X00-C00
8X2-1X01-C00
8X2-1X02-G0X
8X2-1X03-G0X
with rigid insulated probe
8X2-1X05-G0X
8X2-1X06-G0X
Non-hazardous
Explosion proof
TYPE 4X
Class
I
Div. 1, Groups C & D
Class
II
Div. 1, Groups E, F & G
TYPE 4X
Electronics:
Class
I
Div. 1, Groups C & D
Class
II
Div. 1, Groups E, F, G
TYPE 4X
Probe:
Class
I, II, III,
Div. 1,
Groups A, B, C, D, E, F & G
TYPE 4X
Explosion proof
with intrinsically safe
probe circuit
8X2-1X02-R0X
8X2-1X03-R0X
8X2-1X03-Y0X
with rigid insulated probe
8X2-1XX5-R0X
8X2-1XX6-R0X
8X2-1XX6-Y0X
Explosion proof
Class
I
Div. 1, Groups B, C & D
Class
II
Div. 1, Groups E, F & G
TYPE 4X
Electronics:
Class
I
Div. 1, Groups B, C & D
Class
II
Div. 1, Groups E, F, G
TYPE 4X
Probe:
Class
I, II, III,
Div. 1,
Groups A, B, C, D, E, F & G
TYPE 4X
Explosion proof
with intrinsically safe
probe circuit
4
M O D E L
N U M B E R
Models available for quick shipment, usually within one week after factory receipt of a
complete purchase order, through the Expedite Ship Plan (ESP).
Note:
Delivery is ESP only if the Model 822, 832, or 842 and probe selected are both ESP.
Refer to bulletin 50-125 for probe selections.
RELAYS
2
3
4
Relays
3 Relays (lead/lag)
4 Relays (lead/lag)
INPUT POWER
0
1
2
120 VAC
240 VAC
24 VDC
MOUNTING
0
1
2
3
5
6
Integral NEMA 4X
Remote NEMA 4X
Integral NEMA 4X/7/9
Remote NEMA 4X/7/9
Integral NEMA 4X/7/9 with intrinsically safe probe circuit
Remote NEMA 4X/7/9 with intrinsically safe probe circuit
HOUSINGS
C
G
R
Y
NEMA 4X, aluminum base with carbon steel cover,
3
⁄
4
" NPT single conduit
NEMA 4X/7/9, cast iron, 1" NPT single conduit
NEMA 4X/7/9, aluminum, 1" NPT dual conduit
NEMA 4X/7/9, aluminum, 1" NPT dual conduit with 316 SS
3
⁄
4
" NPT single conduit (remote mount only)
PROBE SELECTION
0
1
2
Probe ordered separately
18" (457 mm) guarded probe
36" (914 mm) guarded probe
P R O B E S
A full range of rigid and flexible probes for con-
ductive and non-conductive process media is
available in various lengths and materials of
construction. For further information on probe
assemblies, refer to bulletin 50-125.
R E M O T E
C A B L E
8
2
1
0
0
Remote cable should be shielded, twisted pair,
22-gauge stranded conductors and may be
ordered using Magnetrol
®
part number
009-7146-001. Cable length in feet must be
specified at time of order; 2500 feet (760 m)
maximum; 800 feet (240 m) maximum for
intrinsically safe models.
5
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