What the DS-EP-40-D-2 Is
The Lincoln Vogel DS-EP-40-D-2 is an electronic pressure switch built around a piezoresistive sensing element and a 4-digit LCD. It continuously watches lubrication system pressure from 0 to 40 bar and switches two independent PNP outputs when pressure crosses the values you set. The aluminum housing and stainless steel G1/8 process connection make it suitable for direct mounting on lubrication lines and manifolds.
Lincoln, Vogel, and SKF are trademarks of their respective owners.
This is an aftermarket switch, not manufactured, sponsored, or endorsed by SKF.
DS-EP-40-D-2 designations are for cross-reference identification only.
In a single-line lubrication system it confirms pressure build-up so the controller can stop the pump after a complete cycle.
Specifications
| Type | Electronic pressure switch with LCD |
| Measuring range | 0 to 40 bar |
| Overpressure limit | 100 bar |
| Burst pressure | Greater than 150 bar |
| Supply | 10-32 V DC |
| Outputs | 2 independent PNP switching outputs |
| Sensing principle | Piezoresistive |
| Process connection | G1/8, stainless steel 1.4571 |
| Housing | Aluminum |
| Accuracy | Within 1 percent |
| Display | 4-digit LCD, 0.1 bar resolution |
| Indication | 2 LEDs for output status |
| Lifetime | 100 million cycles |
| Ambient temperature | -10 to +80 degrees C |
| Medium temperature | -10 to +60 degrees C |
Electronic or Mechanical Switch
A mechanical pressure switch clicks at one fixed point and drifts with wear. The spring and diaphragm inside move on every cycle, and after enough operations the trip point shifts slightly. That drift can go unnoticed until the lubrication system starts missing pressure confirmation or alarming late.
Electronic piezoresistive sensing measures continuously and shows the live value on the LCD. You set switch points digitally, and the setting does not drift with mechanical wear. The DS-EP-40-D-2 also gives you two outputs instead of one, so you can handle both normal cycle confirmation and alarm duty from a single device.
The tradeoff is that an electronic switch needs supply voltage and cleaner wiring discipline. A mechanical switch is simpler for basic duty where one fixed trip point is enough. If you need visibility, repeatability, and two independent thresholds, the electronic version earns its place.
Programming the Two Outputs
Each PNP output has a settable switch point and return point. The gap between them is hysteresis, and it prevents rapid on/off chattering when pressure hovers near the threshold. Without hysteresis, a pump or valve that causes small pressure ripples can make the output flicker hundreds of times per cycle.
PNP is a sourcing output. It switches the positive supply to the load, so the load connects between the output terminal and 0 V. The controller input or relay coil sees voltage when the output is active, and no voltage when it is inactive.
A typical use is one output for pressure OK to stop the pump, and the second output for low-pressure alarm. The first output confirms the line reached pressure, while the second watches for a drop that means a broken line, empty reservoir, or failed pump.
Overpressure, Range, and Rupture
Three different numbers mean three different things. Forty bar is the working measuring range where the switch gives accurate readings and reliable switching. One hundred bar is survivable overpressure, meaning the switch can be exposed to that level without damage, but it is outside the working range.
Above 150 bar risks permanent damage. Never size the switch by burst rating, because the burst figure only tells you where the housing or diaphragm fails catastrophically. The useful limit for control is the 40 bar range, and the 100 bar figure is a safety margin for unexpected spikes.
Short pressure spikes from pump start count toward overpressure. A piston pump can generate a sharp rise before the metering valves open, and repeated spikes above 40 bar may not damage the switch immediately but can shorten its life if they approach the overpressure limit.
Related Parts
For flow confirmation instead of pressure, see the flow monitors. For divider cycle confirmation, see the piston detector.
Learn how monitoring fits into centralized lubrication systems, and request pricing through the quotation form.
Frequently Asked Questions
What does the DS-EP-40-D-2 do?
It monitors lubrication system pressure and switches two outputs at set points. The LCD shows live pressure so you can confirm operation at a glance.
What is the measuring range?
The working range is 0 to 40 bar. Pressure above 40 bar is outside the accurate measuring range.
What is the difference between the two outputs?
Each output is fully independent with its own switch point and return point. You can use one for cycle confirmation and one for alarm.
What does PNP mean for wiring?
PNP means the output sources positive voltage to the load. Connect the load between the output terminal and 0 V.
What is hysteresis for?
Hysteresis is the gap between switch point and return point. It stops the output from chattering when pressure sits near the threshold.
What is the difference between overpressure and burst pressure?
Overpressure is survivable without damage up to 100 bar. Burst pressure above 150 bar means permanent failure is likely.
Can it replace a mechanical switch?
Yes, it can replace a mechanical switch in most lubrication monitoring applications. You gain a display, two outputs, and drift-free settings.
What does the display show?
The 4-digit LCD shows live pressure with 0.1 bar resolution. Two LEDs show the switching state of each output.
What are the temperature limits?
Ambient temperature range is -10 to +80 degrees C. Medium temperature range is -10 to +60 degrees C.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
You can also request pricing and availability through the quotation form. Include your application details so a support engineer can confirm the right configuration.
