Dold Liquid Level Relay - DIN Rail Mount, 24 V dc 1 Input

  • RS Stock No. 465-0766
  • Mfr. Part No. MK9151N.12 2-450kOHM DC24V 0.2-20s
  • Manufacturer Dold
Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): DE
Product Details

MK 9151N - level relay


Level monitoring and control of conductive liquids and powders, e.g. maximum and minimum fill level, protection against overfilling and dry running
Monitoring and control of the mix ratio for conductive liquids
General resistance monitoring tasks, e.g. recording temperature limits with PTC
Contact protection relay with delay


3 electrode connections for 2-point and 1-point level control
Measuring circuit for electrodes works on AC voltage generated internally in the device (approx. 30 Hz); therefore no electrolysis occurrence in the fluid
The measuring circuit galvanically isolated from the mains is immune from high levels of interference
Max. lead length to the electrodes: 3000 m
Wide setting range: 2 kΩ → 450 kΩ which enables differentiation between liquid and foam
Response and fallback delay: 0.2 s → 20 s, adjustable separately for MIN and MAX level
Programmable for operating or rest current principle
LEDs to indicate operational readiness and contact position
Output contact 2 changeovers
Overall width: 22.5 mm


  IEC/EN 60 255, DIN VDE 0435-303



Liquid Level Relays are used to monitor the levels of conductive liquids, and are available in Up/Down, Minimum, Maximum, and Fill/Empty variations. Liquid Level Relays are straightforward to install and safe to use.

Application Examples

Liquid Level Relays (Conductive Level Sensors) are used in a wide variety of applications including waste water management and the monitoring and management of corrosive liquid media, and designed specifically to provide for the:

Monitoring and control of liquid levels
Protection of pumps against dry running
Ability to detect liquid leaks in a system
Control of media mixing ratios
Control of liquid levels

Attribute Value
Number of Inputs 1
Mounting Style DIN Rail Mount
Probe Voltage 10V ac
Supply Voltage 24 V dc
Overall Length 90mm
Overall Width 22.5mm
Overall Depth 98mm
Minimum Operating Temperature -20°C
Maximum Operating Temperature +60°C
7 In stock for delivery within 7 working day(s)
Price (ex. GST) Each
$ 264.44
(exc. GST)
$ 304.11
(inc. GST)
Per unit
1 - 4
5 - 9
10 +
Related Products
The K7L-AT50 liquid leakage sensor amplifier by Omron ...
The K7L-AT50 liquid leakage sensor amplifier by Omron can detect a wide variety of liquids ranging from water to chemicals with low conductivity. It internally oscillates AC signals provided to the Sensing Band, protecting it from electric corrosion and ensuring ...
A series of liquid level control relays from ...
A series of liquid level control relays from ABB for conductive liquids. The CM-ENS range gives a choice of 3 variants each with a compact, space saving housing with the highest fire protection and environmentally friendly materials. Installation is quick ...
The Omron general-purpose conductive level controller is a ...
The Omron general-purpose conductive level controller is a single input and DIN rail mount device. This single-level control de-energises when the liquid level drops below the set level electrode. It requires a 110VAC power supply. The liquid level relay is ...
Accepts input from level probes and float switches ...
Accepts input from level probes and float switches to provide enhanced switching capability. Supply voltage 12Vdc (max.)ABS case material. Ingress protection to IP65 (subject to cable entry)Operating temperature range -10 to +50°CSwitching capacity: 5A at 240Vac. Dimensions: H64 x W58 ...