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Yokogawa KS1-10-B

Product Name:​ Yokogawa RAMC / Rotameter Intrinsically Safe Limit Switch Option — KS1-10-B (Ex ia IIC T6)
Product Brief:​
The KS1-10-B is an intrinsically safe reed-switch type limit (alarm) contact assembly designed for mounting on Yokogawa area-type variable area flowmeters / rotameters (RAMC series). It provides a dry contact closure when the float reaches a preset position, suitable for hazardous area (Zone 0/1/2) signaling.
Category:
Description
Technical Specifications:
  • Type:​ Intrinsically Safe Limit Switch (Reed Contact) for Rotameter
  • Protection Concept:​ Ex ia IIC T6 Gb (intrinsic safety)
  • Max Ui (Safety Voltage):​ 30 V
  • Max Ii (Safety Current):​ 101 mA
  • Max Pi (Safety Power):​ 1.4 W
  • Internal Capacitance Ci:​ ≤ 4.16 nF
  • Internal Inductance Li:​ ≤ 0.15 mH
  • Contact Rating (when paired with approved IS barrier):​ Typically 24 VDC, 0.5 A (via barrier)
  • Ambient Temp:​ -40 °C to +70 °C
  • ATEX Certificate:​ PTB 12ATEX2003 / PTB 99 ATEX 2219X
  • Mounting:​ Clamped onto rotameter tube at adjustable setpoint
  • Material (Typical):​ Polycarbonate / stainless steel clamp, epoxy-encapsulated reed switch
Function & Principle:
  • Magnetic coupling from rotameter float actuates sealed reed switch inside the KS1 housing
  • NO or NC dry contact closes/opens at user-set flow alarm point
  • Must be used with a certified intrinsically safe barrier in safe area (e.g., Yokogawa KFD2-SR2-Ex or equivalent)
Installation & Notes:
  • Set alarm position by sliding KS1 housing along rotameter glass tube and locking with set screw
  • Do NOT install the IS switch itself in the hazardous area without proper IS barrier in the safe area
  • Keep away from strong external magnetic fields which could falsely operate the reed
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