National Meter & Automation T200, Manual

3   If a leak exists at this point in the disassembly of the meter, remove the calibration shaft O-ring  Before reinserting the 

O-ring, apply a light coat of silicon grease to it  

4   Clean all parts 

To gain access to the calibration ring, the straightening vane/nose cone must be removed  See 

“Removing the Magnet Carrier/Top Gear Set” on page 14

 for instructions 

To remove the calibration ring from the nose cone assembly:

1   Align the ring slots with the bayonets of the nose cone assembly (located on inner ring of calibration ring)  
2   Carefully lift the calibration ring from the nose cone assembly 

To reinstall the calibration mechanism, follow this procedure in reverse 

CALIBRATION 

LINKAGE

ARROW TIP

CAGE 

INSERT

NOSE 

CONE

TOP SIDE

SMALL HOLE WITH

CHAMFER UP

LARGE HOLE WITH

CHAMFER DOWN

INTO CAGE 

THIS END

CALIBRATION RING

PIN

2", 3" and 4"

RETAINING RING

TRANSMISSION 

GEAR

CALIBRATION DRIVE 

PLATE

CAGE INSERT 

(TOP VIEW)

PIN OF 

CALIBRATION 

RING

6"

Figure 11:  Calibration ring/linkage assemblies

Reassembling the Calibration Mechanism

1   Align the pin on the perimeter of the calibration ring with the arrow tip located on the nose cone assembly (see 

Figure 11 on page 15

)  

2   For 2", 3" and 4" sizes, install the calibration linkage into the cage with the larger hole to engage the calibration ring 

tab, with the side of chamfered edge of the hole towards the nose cone assembly (see 

Figure 11 on page 15

)  

3   With the calibration linkage fully inserted to the cage stop, install the nose cone onto the cage and rotate it counter-

clockwise to engage the pin of the ring to the calibration linkage  The hole of the calibration linkage has to be aligned 

onto the calibration shaft, engaging it fully so that the calibration ring cannot vibrate during operation  

4   Tighten the calibration shaft lock screw to securely hold the calibration ring in position 

After servicing or replacing the calibration mechanism, check the accuracy and calibration according to the instructions in the 

Recordall Turbo Series Meter User Manual

Servicing Parts and Assemblies

June 2016

RCS-UM-00076-EN-04

Page 15