Kotron
®
Sentinel
Model 804
RF Level Transmitter
D E S C R I P T I O N
The Sentinel is a unique, powerful level transmitter. The
leading-edge microprocessor-based circuitry has non-
volatile memory. The display and keypad simplify
calibration and setup of the instrument. Powerful diag-
nostics check all functions of the system, simplifying
troubleshooting. MagneCal™ offers the user the greatest
improvement in RF Capacitance—one small level change
is needed to calibrate.
F E A T U R E S
•
Two or four SPDT relays with gold flash contacts for
alarm and control operation.
•
Optional intrinsically safe probe circuitry (with
on-board barriers).
•
16-button keypad and 2
×
16 LCD display.
•
Isolated 4–20 mA output includes an active/passive
mode.
•
Relays can be configured for sequential or lead/lag
pump control.
•
One small level change (2% of span) needed for initial
probe calibration.
•
4–20 mA and up to eight control points can be pro-
grammed with no level change.
•
Powerful self-diagnostics check the system, including
probe.
•
Relay #1 can be dedicated as a diagnostics relay.
A P P L I C A T I O N S
•
Continuous level measurement
•
Interface measurement
•
Hydrocarbons and solvents
•
Slurries
•
Acids
•
High temperature/pressure liquids
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 cov-
ered with 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
-40° to +160° F (-40° to +70° C)
99% non-condensing (electronics)
Better than ±1.0%
±0.1%
±0.5%
±0.01%/° F (±0.018/° C)
16-button keypad
2 line
×
16 character LCD display
4-20 mA (isolated), reversible, 1000 ohms max. loop resistance
4-20 mA (isolated), reversible, loop resistance
dependent on power supply
5 pF minimum; 50,000 pF maximum
0-90 seconds
0-50,000 pF
0.5 pF minimum; 50,000 pF maximum
0-90 seconds level rising, level falling, both
10 amp @ 120/240 VAC resistive
10 amp @ 30 VDC resistive
0.5 amp @ 125 VDC resistive
2500 feet (760 meters)
800 feet (240 meters)
Power consumption
Ambient temperature range
Humidity
Accuracy
Repeatability
Linearity
Temperature effect
Operator interface:
Data entry
Display
Continuous Output:
Active signal
Passive signal
Range
Damping
Discrete output (SPDT) with gold flash contacts:
Set point range
Adjustable differential range
Time delay
Relay output:
AC
DC
Maximum remote cable length:
Standard
Intrinsically safe
2
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 B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
NEMA 4X, IP65
Integral units
Class
I
Div. 1, Groups B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
NEMA 4X, IP65
Electronics
Class
I
Div. 1, Groups B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
NEMA 4X, IP65
Remote probe
Class
I
Div. 1, Groups A, B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III,
NEMA 4X, IP65
Approved Model
804-XXXX-23X
804-XXXX-33X
Insulated rigid probes only
804-XXXX-53X
804-XXXX-63X
Explosion proof
with intrinsically safe
probe circuit
CSA
804-XXXX-23X
804-XXXX-33X
Insulated rigid probes only
804-XXXX-53X
804-XXXX-63X
Explosion proof
Explosion proof
with intrinsically safe
probe circuit
Class
I
Div. 1, Groups C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
TYPE 4X
Integral units with IS probe circuit
Class
I
Div. 1, Groups B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
TYPE 4X
Electronics
Class
I
Div. 1, Groups B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
TYPE 4X
Remote probe
Class
I
Div. 1, Groups A, B, C & D
Class
II,
Div. 1, Groups E, F, & G
Class
III
TYPE 4X
For Class
II,
Groups E & F insulated probes must be used
These units have been tested to EN 50081-2
and EN 50082-2 and are in compliance with
the EMC Directive 89/336/EEC.
3
D I M E N S I O N A L
I N C H E S
( m m )
B
1 Rotation
clearance
A
S P E C I F I C A T I O N S
B
1 Rotation
clearance
A
C
G
G
C
G
G
plugged
D
plugged
D
2
Optional
mounting
flange
2
Optional
mounting
flange
.1875 (5)
.2500 (6)
2.95
(75)
Integral Mount with Flexible Probe
.50 (13)
.625 (16)
Integral Mount with Standard Rigid Probe
4.63
(118) Dia.
3.00
(76)
2.75
(70)
3.23
(82)
3
/
4
"
NPT
Optional
mounting
flange
2
.50 (13)
.625 (16)
Rigid Probe
4
D I M E N S I O N A L
I N C H E S
( m m )
S P E C I F I C A T I O N S
B
1 Rotation
clearance
A
( c o n t . )
E
G
G
2 Holes
.38 (10) Dia.
2.00
(51)
2.37
(60)
plugged
F
3.00
(76)
3.50
(89)
3
Remote Mount
1
/
2
" NPT
or
3
/
4
" NPT
4.63
(118) Dia.
3.00
(76)
2.75
(70)
4.67
(119)
3
/
4
"
NPT
Optional
mounting
flange
2
.1875 (5)
.2500 (6)
2.95
(75)
Flexible Probe
Outline Dimensions
Housing
NEMA 4X/7/9
Aluminum
Conduit
Connections
NEMA 4X/7/9
(remote probe housing)
Single conduit
NEMA 4X/7/9
Dual conduit
3
A
3.87
(98)
G
⁄
4
" NPT
B
5.93
(151)
C
10.89
(276)
Standard Rigid Probe
D
E
2.44
(61)
13.44
(341)
F
4.11
(104)
C
12.33
(313)
Flexible Probe
D
E
4.71
(119)
13.44
(341)
F
4.11
(104)
1" NPT
NOTES:
Allow 8.00 (200) overhead clearance for cover removal.
Standard process connection is
3
⁄
4
" NPT. Consult probe bulletin (50-125) for
flange and other probe connections.
Probe/amplifier connecting cable to be shielded, twisted pair, 22-gauge stranded
conductors, Magnetrol part number 009-7146-001; 2500 feet (760 m) maximum;
800 feet (240 m) maximum for intrinsically safe models.
5
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