Valve Position Indicators
KLS limit switch boxes sit on top of the actuator and tell your control system when the valve is fully open or fully closed, a key part of any safety system. Sturdy aluminium case, in weatherproof and explosion proof versions.
- Series
- 2
- Models
- 12
- Weatherproof (KLS1)
- IP67 / IP68
- Certified
- KCs · IECEx

Description
Choose The Mechanism

KLS1 series
Weatherproof
Weatherproof limit switch box for valves in the open or in wet areas, with mechanical or proximity switches and a 3-way dome indicator readable from every side.
- KOSAPLUS range
- KLS10 – KLS14
- Industries
- Pneumatic and electric actuators on on/off valves

KLS2 series
Explosion Proof
Explosion proof limit switch box for hazardous areas, with the same switch choices as KLS1 and a 3-way dome indicator. P&F and Soldo proximity switches are intrinsically safe (Ex ia IIC T6).
- KOSAPLUS range
- KLS20 – KLS24
- Industries
- Actuated valves in hazardous areas
Certified For Safety
Every certificate is issued to KOSAPLUS by an independent body and lists the models it covers.
All certificatesModel range
Every Valve Position Indicator Series
Reading a model name
KLS1P
Part 1
- KLS
- Limit switch box
Part 2
- 1
- Weatherproof
- 2
- Explosion proof
Part 3
- 0
- Mechanical 2 × SPDT
- P · N
- Proximity PNP · NPN
- 2
- Proximity 2-wire
- 3 · 4
- Proximity P&F · Soldo
Blue models have a price online. Click any model for its details.
Model code
Read A Full Model Code
Each part of the full code stands for one choice in how the unit is built.
- K
Model
Confirmed in your quote.
- 2
Protection
Explosion proof
- 1
- Weatherproof, IP67 / IP68
- 2
- Ex db IIC T6 Gb, Ex tb IIIC T80°C Db, IP67
- P
Switches
Proximity PNP
- 0
- Mechanical 2 × SPDT
- P
- Proximity PNP
- N
- Proximity NPN
- 2
- Proximity 2-wire
- 3
- Proximity P&F, Ex ia IIC T6
- 4
- Proximity Soldo, Ex ia IIC T6
- S
Temperature
Standard, -20 to 60°C
- S
- Standard, -20 to 60°C
- L
- Low temperature, -40 to 60°C
- A1
Housing
ALDC12 aluminium, bushed
- A1
- ALDC12, bushed
- A2
- ALDC12, non-bushed
- S4
- SUS304
- S6
- SUS316
- L6
- SUS316L
- 3
Indicator
3-way
- 2
- 2-way indicator
- 3
- 3-way indicator
- S
Stem
Short
- S
- Short stem
- L
- Long stem (+5 mm)
- N3
Cable entry
NPT 3/4
- F2
- PF 1/2 (KLS1)
- F3
- PF 3/4 (KLS2, KCs only)
- N3
- NPT 3/4 (KLS2)
- B2
Bracket
Bracket BS2
- B1
- Bracket BS1
- B2
- Bracket BS2
- B3
- Bracket BS3
- B4
- Bracket BS4
- M1
- Bracket MB1 (use a long stem)
Highlighted in each row: the choice used in the example code.
Options
Built For Your Application
Add-ons fitted by KOSAPLUS to your actuators. Add them while you configure your actuator, or tell us which ones you need in your quote.
Need any of these add-ons?
Choose your actuator first: on a series marked Configurable online you can add them to the build, otherwise list them in your quote.
Documents