Inserting Safe‑Drive sensor - PR-23 - PR-23-AC - PR-23-AP - PR-23-GC - PR-23-GP - PR-23-M - PR-23-RP - PR-23-SD - PR-23-W

PR-23 Series User Guide

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User guide
  • Check that the gaskets and gasket surfaces are clean and undamaged
  • Remove the sensor cable gland and unlock the inner casing
  1. Insert the sensor into inner casing.
    1. Make sure that the sensor cable gland has been taken off. Match the bayonet closing with sensor flange so that the latch is slightly to the left of the top and the sensor cable passage is straight down.
    2. When sensor flange is flush with the bottom of inner casing, rotate inner casing 60° clockwise to lock it to the flange.
    3. Push down locking latch to secure the connection.
  2. Fit outer casing over inner casing.
    1. To match the casings, check that the rail on the inner casing matches the groove on the outer casing. Make sure that the latch of the inner casing is slightly to the right from the top and the handle of the outer casing points up.
    2. Turn the handwheel clockwise until it stops to draw the inner casing with sensor into outer casing.
  3. The sensor should now be inside retractor and about 140 mm (5.5 in) of the screw thread should stick out of the middle of the wheel.
    1. Unlock the latch on outer casing.
    2. Take a firm hold of the handwheel and handle and lift retractor (with sensor) over the isolation valve flange. Keep handle up.
  4. Rotate outer casing 60° clockwise to lock the bayonet (1), and lock the outer casing latch (2).
  5. Insert the safety pin.

    Lock the safety pin with safety clip.

    WARNING Do not proceed until you have completed this step.
  6. Close the blow-out ball valve under isolation valve.
    1. Lift up the isolation valve handle locking plate.
    2. Open the isolation valve by turning the valve handle 90°. The valve is open when the ball valve handle is parallel to the retractor and sensor.
  7. Now the sensor can be inserted into the process.
    1. Turn the handwheel counterclockwise until it stops, that is until the sensor flange connects with isolation valve and only the end of the screw thread is visible.
      WARNING If you detect leaking, revert immediately to the previous step. Do not proceed with the installation until the reason for leakage has been cleared and fixed.
  8. Fit the four M12 nuts to the bolts holding the sensor to isolation valve and screw them on with a 19 mm or ¾ in wrench.
    CAUTION Do not overtighten the nuts, set the torque at 50 Nm (37 ft/lbs).
    WARNING Do not proceed until you have completed this step.
  9. Remove the safety clip (1) and the safety pin (2).
  10. Turn the wheel 90° counterclockwise.
    1. Open the locking latch on outer casing.
    2. Rotate outer casing handle 60° counterclockwise.
  11. Turn the handwheel counterclockwise to drop the thread (1), and lift off outer casing.
  12. Lift up the latch of inner casing to unlock it.
    1. Rotate the casing 60° counterclockwise to release it from the flange.
    2. Lift inner casing away from the sensor head.
  13. Ensure the DTR is switched off. Connect the sensor cable to the DTR.
    1. Push the interconnecting cable through the cable gland and into the sensor.
    2. Connect the interconnecting cable to the sensor.
    3. Tighten the cable gland onto the sensor.
    4. Fit the nameplate onto the sensor and screw it on. Turn on DTR power to power up the Safe‑Drive system. Open wash valve.