Spirax Sarco RIM20, Инструкция по установке и обслуживанию, Страница: 25 / 132

IM-P198-05 MI Issue 2 25
Caution!
The sensor alignment pointer must point downstream, in the direction of flow.
Note
If line pressure is above 34.473 bar g (500 psi g), it could require up to
33.895 N-m (25 ft lb) of torque to insert the flowmeter.
Do not confuse this with possible interference in the pipe.
1. Calculate the required sensor probe insertion length. Measure from the depth marker
arrow down the stanchion and scribe a mark at the calculated insertion depth.
2. Fully retract the flowmeter until the sensor head is touching the bottom of the stem housing.
Attach the meter assembly to the DN50 (2") full-port isolation valve, if used. Use Teflon
tape or pipe sealant to improve seal and prevent seizing on NPT style.
3. Remove the two top stem clamp nuts and loosen two stem clamp bolts. Slide the stem
clamp away to expose the packing gland nuts.
4. Loosen the two packing gland nuts. Loosen the stem lock bolt adjacent to the sensor
alignment pointer. Align the sensor head using the sensor alignment pointer. Adjust the
alignment pointer parallel to the pipe and pointing downstream. Tighten the stem lock
bolt to secure the sensor position.
5.
Slowly open the isolation valve to the full open position. If necessary, slightly tighten the
two packing gland nuts to reduce the leakage around the stem.
6. Turn the insertion tool handle clockwise to insert the stem into the pipe. Continue until
the top of the upper retractor bracket lines up with the insertion length mark scribed on
the stanchion. Do not force the stem into the pipe.
7. Tighten the packing gland nuts to stop leakage around the stem. Do not torque over
33.895 N-m (20 ft-lbs).
8. Slide the stem clamp back into position. Torque stem clamp bolts to 20.38 N-m (15 ft-lbs).
Replace the stem clamp nuts and torque to 13.56 - 20.34 N-m (10 - 15 ft-lbs).
9. To separate the insertion tool from the flowmeter, remove four socket head cap bolts
securing the upper and lower retractor brackets. Remove the insertion tool.