Monitoring technique
Level sensing relay MK 9151
varimeter
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According to IEC/EN 60 255, DIN VDE 0435-303
3 probe connections for 2-point and 1-point level control
Also for use as moisture detector
High interference resistance of the measuring circuit, which is
isolated from the mains
Max. wire length to the probes: 1500 m
Large setting range: 2 ... 450 kΩ
this permits differentiation between fluid and foam
Adjustable response and release time delay: 0,2 ... 20 s
Programmable for open circuit operation (without bridge)
or closed circuit operation(bridge X1-X2 or X1-COM)
For auxiliary voltages of 24 ... 415 V AC or 24 V DC
Green LED for operation
Yellow LED for contact position
1 or 2 changeover contacts
Also available with sealable transparent cover
Available with safe separation according to IEC/EN 61 140,
IEC/EN 60 947-1
Width 22,5 mm
Approvals and marking
0221581
Function diagrams
Supply UH
0
Level / Niveau
MAX
*
Canada / USA
* see variants
COM
X1
11 - 14
11 - 12
11 - 14
11 - 12
Application
t
t
t
COM
X1
t
t
t
M6620_d
•
Level monitoring and control for conductive liquids and powders,
e.g. maximum and minimum filling levels, overfilling and protection
against dry running
•
Monitoring and control of the mixing ratio of conductive liquids
•
General resistance monitoring tasks, e.g. limit temperature
detection with PTC
Indicators
1-point level control
Supply UH
0
Level / Niveau
MAX
MIN
green LED:
yellow LED:
Notes
on, when supply connected
on, when output relay active
All commercially available probes are suitable.
The reference probe for level measurement is generally located at the
lowest point of the container and must always be connected to the "COM"
terminal. The container itself can be used as a reference probe if it
consists of conductive material.
1-point level control (see Figure) is especially suitable for protection
against overfilling and dry running on containers with a free inlet/outlet.
In this configuration, all that is required besides the reference probe
"COM" is the "MAX", which must be located at the desired limit level. The
output relay switches over after the set delay time if the fluid level
exceeds or falls below the limit level, which permits fluid to be pumped
out or added.
COM
X1
11 - 14
11 - 12
11 - 14
11 - 12
t
t
t
COM
X1
t
t
t
M6621_f
2-point level control
Circuit diagrams
A1 11
MIN MAX COM
A1 11 21
MIN MAX COM
A2 X1 X2
11
A2 X1
COM
11
21
A1
MIN MAX COM
X1 X2
12
14
A1
MIN MAX
12
14
22
24
22 24 X1
M7659_a
12 14 A2
M7660_a
12 14 A2
MK 9151.11
MK 9151.12
All technical data in this list relate to the state at the moment of edition. We reserve the right
for technical improvements and changes at any time.
1
MK 9151 / 22.04.04 d
Technical data
Input
Setting range of the
fluid resistance:
Technische Daten
Wire connection:
2 x 1,5 mm
2
solid or
2 x 1,0 mm
2
stranded wire with sleeve
DIN 46 228-1/-2/-3/-4
Flat terminals with self-lifting
clamping piece
IEC/EN 60 999-1
DIN rail
IEC/EN 60 715
155 g
2 ... 450 kΩ
(other ranges on request)
Setting:
on logarithmically divided absolute scale
Switching point hysteresis:
approx. 3 % (at 450 kΩ) ... 6 %
(at 2 kΩ) of the set value
Voltage and temperature
influence:
< 2 % of the set value
Max. cable length to the
probes:
Set value
Cable length
(at 100 nF/km)
450 kΩ
50 m
100 kΩ
200 m
35 kΩ
500 m
1500 m
10 kΩ
5 kΩ
3000 m
Max. sensing voltage:
approx. AC 10 V
Max. sensing current:
approx. AC 1,5 mA
(internally generated)
Response and release times:
0,2 ... 20 s
Setting on logarithmically-divided
absolute scale
Auxiliary circuit
Auxiliary voltage U
H
:
AC 24, 42 ... 48, 110 ... 127,
220 ... 240, 380 ... 415 V
DC 24 V
Voltage range of U
H
AC: 0,8 ... 1,1 U
N
DC: 0,85 ... 1,25 U
N
Nominal power consumption
AC: approx. 2 VA
DC: approx. 1 W
Frequency range:
45 ... 400 Hz
Output
Contacts
MK 9151.11:
MK 9151.12:
Thermal current I
th
:
Switching capacity
to AC 15
NO contact:
NC contact:
Electrical life
to AC 15 at 1 A, AC 230 V:
Permissible operating:
Short-circuit strength
max. fuse rating:
Mechanical life:
General data
Operating mode:
Temperature range:
Clearance and creepage
distances
overvoltage category /
contamination level
input/auxiliary circuit:
input/output circuit:
auxiliary/output circuit:
EMC
Electrostatic discharge:
HF irradiation:
Fast transients:
Surge voltages:
Interference suppression:
Degree of protection:
Housing:
Vibration resistance:
Climate resistance:
Terminal designation:
Continuous operation
- 20 ... + 60°C
Wire fixing:
Mounting:
Weight:
Dimensions
Width x height x depth:
Standard type
22,5 x 82 x 99 mm
MK 9151.11 2 ... 450 kΩ AC 220 ... 240 V
Article number:
0044505
1 changeover contact
•
Output:
•
Measuring range:
2 ... 450 kΩ
•
Auxiliary voltage U
H
:
AC 220 ... 240 V
•
Width:
22,5 mm
Variants
MK 9151._ _/60
MK 9151. _ _ /001:
MK 9151. _ _ /002:
MK 9151. _ _ /400:
MK 9151. _ _ /106:
stock item
CSA approval
time delay on Min level
time delay on Max level
with sealable transparent cover
with save separation according
to VDE 0106
Ordering example for Variants
MK 9151 .12 /_ _ _ 2 ... 450 kΩ
AC 220 ... 240 V
Auxiliary voltage
Measuring range
Variant, if required
Contacts
Type
Accessories
OA 5640:
Applications
Standard probe
1 changeover contact
2 changeover contacts
5A
3 A / AC 230 V
1 A / AC 230 V
IEC/EN 60 947-5-1
IEC/EN 60 947-5-1
IEC/EN 60 947-5-1
5 x 10
5
switching cycles
6 000 switching cycles / h
4 A gL
IEC/EN 60 947-5-1
30 x 10
6
switching cycles
A1
Supply U H
A2
MIN
12 11 14
12
14
11
MAX
COM
22 21 24
22
24
21
X1
Level/Niveau
M6612
1-point level control
IEC 60 664-1
(1 kV for DC 24 V-devices)
(4 kV for MK 9151.12)
A1
Supply U H
A2
MIN
MAX
12 11 14
12
14
11
COM
22 21 24
22
24
21
X1
6 kV / 2
6 kV / 2
4 kV / 2
8 kV (air)
IEC/EN 61 000-4-2
10 V / m
IEC/EN 61 000-4-3
2 kV
IEC/EN 61 000-4-4
1 kV
IEC/EN 61 000-4-5
Limit value class B
EN 55 011
Housing: IP 40
IEC/EN 60 529
Terminals: IP 20
IEC/EN 60 529
Thermoplastic with V0 behavior
according to UL subject 94
Amplitude 0,35 mm,
frequency 10 ... 55 Hz, IEC/EN 60 068-2-6
20 / 060 / 04
IEC/EN 60 068-1
EN 50 005
Level/Niveau
M6613
2-point level control
E. DOLD & SÖHNE KG • D-78114 Furtwangen
e-mail dold-relays@t-online.de • internet http://www.dold.com
• Postf. 1251 • Tel. +49 7723 654 0 • Telefax +49 7723 654 356
2
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