MK9151 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Level sensing relay MK 9151 varimeter

Monitoring technique
Level sensing relay MK 9151
varimeter
Function diagrams
Supply UH
0
Level / Niveau
MAX
11 - 14
COM X1 11 - 12
t
11 - 14
COM X1 11 - 12
t
1-point level control
Supply UH
0
Level / Niveau
MAX
MIN
11 - 14
COM X1 11 - 12
t
11 - 14
COM X1 11 - 12
t
2-point level control
Circuit diagrams
A1 11
MIN MAX COM
A2 X1 X2
11
t
t
t
t
M6620_d
t
t
t
t
M6621_f
• 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
*
Canada / USA
* see variants
Application
• 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
green LED:
yellow LED:
on, when supply connected
on, when output relay active
Notes
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.
A1 11 21
MIN MAX COM
A2 X1 COM 11
21
A1 MIN MAX COM
12 14
A1 MIN MAX 12 14 22 24
X1 X2
12 14 A2
MK 9151.11
M7659_a
22 24 X1
12 14 A2
MK 9151.12
M7660_a
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