RCm Flo-Gage 7000 Series, Flo-Gage 8000 Series Installation, Operation And Maintenance Manual
I NSTALLATIO N, OPE RATI O N AND MAI NTE NAN CE
Threaded and Wafer Style Flowmeters
T able of Contents
Page
1.1.
Principle of OperationPrinciple of Operation
1.
Principle of Operation
1.1.
Principle of OperationPrinciple of Operation
2.2.
Installation PlanningInstallation Planning
2.
Installation Planning
2.2.
Installation PlanningInstallation Planning
3.3.
InstallationInstallation
3.
Installation
3.3.
InstallationInstallation
3.1 Safety Considerations ........................................ 3
3.2 Changing the Dial Orientation ............................ 3
3.3 Changing from Horizontal to Vertical.................. 3
3.4 Threaded bodies ................................................ 3
3.5 Wafer style bodies .............................................. 3
4.4.
Operation and MaintenanceOperation and Maintenance
4.
Operation and Maintenance
4.4.
Operation and MaintenanceOperation and Maintenance
4.1 Preventive Maintenance ..................................... 4
4.2 Checking Zero .................................................... 4
4.3 Checking the Pointer Preload ............................. 4
4.4 Coarse Zero Adjustment .................................... 4
4.5 Fine Zero Adjustment ......................................... 5
4.6 Flow Calibration.................................................. 5
4.7 Cleaning of Pressure Ports................................. 6
4.8 Adjustment of Reed Switches..............................6
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22
2
22
22
2
22
33
3
33
2
5
0
300
2
00
GPM
1
5
0
SP.GR.=1.0
1
0
0
44
4
44
350
400
5.5.
TT
roubleshootingroubleshooting
5.
T
roubleshooting
5.5.
TT
roubleshootingroubleshooting
5.1 Pointer Fluctuations............................................ 6
5.2 Zero Shift ............................................................ 7
5.3 Sluggish Meter Response .................................. 7
6.6.
Correction FCorrection F
6.
Correction F
6.6.
Correction FCorrection F
6.1 Liquid Service ..................................................... 7
6.2 Compressed Gas Service .................................. 7
7.7.
Cutaway viewCutaway view
7.
Cutaway view
7.7.
Cutaway viewCutaway view
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actorsactors
actors
actorsactors
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Figures
Figure 1 Wafer style flowmeter.......................... 1
Figure 2 Installation conditions.......................... 2
Figure 3 O-ring installation................................ 3
Figure 4 Zero reference point............................ 4
Figure 5 Pointer preload....................................4
Figure 6 Cam nut and stop nut.......................... 5
Figure 7 Cam follower adjustment..................... 6
Figure 8 Reed switch adjustment...................... 6
Figure 9 Cutaway view ...................................... 8
66
6
66
77
7
77
88
8
88
Wafer Style Flowmeter
Figure 1
1.
Principle
of
Operation
2.
Installation
Planning
and Site
Selection
RCM Series 7000 and Series 8000 Flo-Gages measure flow rate by sensing the pressure
differential created across the flow nozzle which is machined into the body of the flowmeter . A pair of matched, opposed bellows sense the differential pressure and drive a mechanical linkage to indicate flow rate directly on the dial. (When fitted with options RW2, the
bellows and mechanical linkage are replaced with a solid state differential pressure sensor
and digital readout.)
Select a site which is convenient for viewing and which provides service access to the front
and rear of the flowmeter . Note that the dial can be ordered in any orientation at 90 degree
increments and can be easily reoriented in the field. See “Changing the Dial Orientation” in
the installation section. The site selected should provide at least 10 pipe diameters of
straight meter size pipe between the meter inlet and any upstream fitting such as elbow ,
tee or valve. There are no special piping requirements for downstream connections to the
meter.
Note that the meters (except those with sanitary connections, which are calibrated for
tubing) are calibrated based on schedule 40 pipe connections. Tubing or hoses do not
have the same ID as pipe and should be transitioned to pipe at least 10 diameters upstream of the meter to achieve rated accuracy .
Page 2
GPM
FLOW
d
10d
Installation Conditions
Figure 2
Avoid placing the meter where it will be subjected to water hammer and mount the meter
rigidly to minimize shock or vibration.
Meters installed outdoors or exposed to splashing liquids should be ordered with a gasketed
case.
Protect from freezing liquids.
3.
Installation
3.1 Safety Consider ations
Do not exceed the pressure and temperature limits marked on the nameplate of theDo not exceed the pressure and temperature limits marked on the nameplate of the
Do not exceed the pressure and temperature limits marked on the nameplate of the
Do not exceed the pressure and temperature limits marked on the nameplate of theDo not exceed the pressure and temperature limits marked on the nameplate of the
metermeter
. Although each meter is pressure tested to 150% of nameplate rating. Although each meter is pressure tested to 150% of nameplate rating
meter
. Although each meter is pressure tested to 150% of nameplate rating
metermeter
. Although each meter is pressure tested to 150% of nameplate rating. Although each meter is pressure tested to 150% of nameplate rating
pressure may cause injurypressure may cause injury
pressure may cause injury
pressure may cause injurypressure may cause injury
Temperature ratings are determined by the effects on the mechanical linkage, elastomer
seals and electronics (if electronics are fitted). If temperature ratings are exceeded, the
meter may be damaged or fail. Contact the factory for application assistance for expanded
temperature operation.
, leaking or meter damage., leaking or meter damage.
, leaking or meter damage.
, leaking or meter damage., leaking or meter damage.
, over, over
, over
, over, over
3.2 Changing the Dial Orientation
Note the flow direction arrow on the body . If necessary , change the dial facing direction by
removing the four screws holding the body to the housing. Do not remove the two screws
holding the housing to the cell block assembly.
Position the housing at any 90 degree position. R eplace the four screws taking care not to
pinch the o-ring seals.
O-Rings
--
-
--
Polycarbonate
Housing
Aluminum
Housing
Either Housing
O-Ring Installation
Figure 3
3.3 Changing from Horizontal to Vertical or Vertical to Horizontal
Remove the lens by rotating counter-clock wise by hand. Do not remove the pointer . Move
the dial forward by prying with a small knife at the 12:00 o'clock position. Rotate the dial to
the desired viewing position and push the dial back into position. There are 4 locating
indents on the dial edge to position the dial at 90 degree increments.
Using a small screwdriver blade to lift the end of the retainer ring up and out of the housing
recess, remove the retainer ring and the dial crystal. Do not remove the pointer . Remove
the two screws holding the dial and rotate the dial to the desired viewing position.
Reinstall the screws to hold the dial in position. It will be necessary to shorten one screw to
approximately 1/8" (3 mm) by cutting with scissors or a knife. Use the short screw in the
position away from the meter body .
Rezero the meter using the FINE ADJUSTMENT procedure.
3.4 Threaded Bodies
Make up thread joints using a suitable thread sealant. Be sure threads are clean and free
of burrs before making up joints. Apply wrench torque only to the meter body.
exert any wrenching force to the meter housing.
3.5 Wafer Style Bodies
DO NODO NO
DO NO
DO NODO NO
TT
T
TT
Install the meter between mating flanges. T ake care to center the gaskets so that they do
not protrude at all into the pipeline. Gasket protrusion will cause significant calibration
errors.
Page 3
4.
4.1 Preventative Maintenance
The meter does not require routine lubrication or service of any kind. Keep the interior of
meter housing clean and free of dust, moisture, oils or corrosive materials. Protect the
meter from dripping or splashing corrosives or solvents which may attack meter exterior
and eventually damage the internal mechanism.
Operation
and
Maintenance
4.2 Checking Zero
Water hammer or pressure surges can displace the bellows and cause the zero to shift. If
the pointer does not return to the stop pin when flow through the meter is zero, or if the
pointer does not move away from the stop pin at 12-15% of full scale flow , then check the
zero adjustment as follows:
• Stop flow .
• Remove the lens.
• Observe the position taken by the pointer . When properly adjusted, the pointer should
point to the zero reference point as shown in Figure 4.
• If the pointer is positioned within 1/2" (12 mm) of stop pin, then follow FINE ADJUST MENT procedure to rezero pointer .
• If the pointer is positioned more than 1/2" (12 mm) from the stop pin, then follow the
COARSE ADJUSTMENT procedure.
.02"-.05"
Zero Reference Point
Dial
Pointer
Zero Mark
.5
4.0
Page 4
Zero Reference Point Pointer preload
Figure 4 Figure 5
4.3 Checking the Pointer Preload
If the fine adjustment has been performed repeatedly, the pointer return spring preload
should be checked. Manually rotate the pointer CCW toward full scale. The pointer should
stop at full scale. If the pointer goes beyond full scale, adjust with the cam nut following the
COARSE ADJUSTMENT procedure. Otherwise, go to the FINE ADJUSTMENT procedure.
4.4 Coarse Zero Adjustment
If necessary to restore spring preload, place a small screwdriver in the slotted pointer hub.
Grip the pointer close to the hub on both sides of the hub and rotate the hub approximately
one-quarter turn clockwise with respect to the pointer. Check preload by rotating the pointer
CCW toward full scale. When properly adjusted, the pointer should stop at full scale.
4.
Release the pointer. Using the cam nut, adjust the lever so that the pointer points to the
zero reference point.
Check the position of the stop nut. Applying force to the stop nut, manually move the
center shaft to the right (as seen from the rear) and make certain that the stop nut contacts
the cell block when the pointer stops. If necessary , adjust the stop nut to stop the pointer
near the 6 o’clock position. The factory set point is the “U” in “USA”.
Operation
and
Maintenance
(Continued)
CAM NUT
Cam nut and stop nut
IMPORTANT. The stop nut must stop the center shaft movement before the bellows
hit the cell cap. If the bellows hit the cell cap, the bellows or the cap can be damaged
causing leaking or meter errors.
Adjust the cam nut until the pointer points at the zero reference point. Gently tap the meter
to overcome residual friction while making the adjustment.
Test for freedom of pointer movement by rotating the pointer approximately 30 degrees
and releasing. P ointer should return quickly to the zero reference. Clean and reinstall the
lens.
4.5 Fine Zero Adjustment
STOP NUT
Figure 6
CENTER SHAFT
CELL CAP
CELL BLOCK
Note: If fitted with transmitter model W, X, Y or Z or with reed switches, do not use this
procedure. Do all ajustments with the coarse zero adjustement. Adjustment of the fine zero
using this method will require recalibration of reed switches or transmitter .
Grip the pointer close to the hub on both sides of the hub and rotate the hub with respect
to the pointer . The pointer should aim directly at the “zero reference point” printed on the
dial as shown in figure 4.
Gently tap the meter to overcome residual friction while making the adjustment. Test for
freedom of pointer movement by rotating the pointer approximately 30 degrees and releasing. P ointer should return quickly to zero reference. Clean and reinstall lens.
4.6 Flow Calibration
The orifice has been factory adjusted to provide the proper differential pressure for accurate meter operation. Meters are factory calibrated with water prior to shipment. NIST traceable certifications are available when ordered prior to shipment or may be obtained by
returning the meter for recalibration. Field calibration may be verified using the following
procedure:
Check the zero adjustment of the pointer . Cycle the flow rate from zero to full scale three or
four times and observe the pointer motion. Pointer should return to zero smoothly.
Page 5
Establish a known flow rate through the meter corresponding to approximately 90% of full
scale and observe the meter indication. Move the cam follower up to decrease the pointer
indication or down to increase the pointer indication.
4.
Operation
and
Mainte-
(Continued)
nance
T o move the cam follower up, rest a screwdriver on the cell block with the blade between
the cell block and the center shaft. Pry gently up on the cam follower. To move the cam
follower down, place a screwdriver on the top of the cam follower . With the blade resting
against the case press gently down. Take care not to put excessive forward pressure on
the cam follower to prevent the "C" clip on the pivot shaft from coming off. Rezero the meter
using the cam nut.
CAM
FOLLOWER
Cam Follower Adjustment
Check meter indication at 50% of full scale. Meter should indicate actual flow rate within
3% of full scale. If meter does not indicate actual flow , consult factory .
4.7 Cleaning of Pressure Ports
Remove the meter housing from the body by removing 4 screws. Remove the pulsation
snubbers from the body by inserting a small wood screw into the hole in the pulsation
snubbers and gently pull them out. Clean passages in body and snubbers and reassemble.
If you are unable to clean without further disassembly , the meter should be returned to the
factory for service.
INCREASE
INDICATION
Figure 7
DECREASE
INDICATION
Reassemble the meter housing to the body in the desired viewing position. Take care to
properly seat the inner and outer o-rings before tightening screws.
4.8 Adjustment of Reed Switches
Check the meter zero and correct if necessary using the coarse or fine zero procedure
before proceeding. Connect continuity tester to N.O. contact. Loosen the switch clamp.
Establish the desired flow rate for switch tripping. Slide switch to left most position.
Range window should show a partial or complete green mark.Slowly slide to right while
monitoring N.O. contact. Switch will close. Continue to slide to right. Switch will open
(false trigger). Continue to slide to right until switch closes again. Adjust by sliding to
right to raise setpoint, left to lower. Tighten clamp. Note: Tiny adjustments may be required to reach the desired set point.
adjustment clamp screws
set point range windows
terminal strip
Reed Switch Adjustment
Figure 8
Page 6
5.
5.1 Pointer Fluctuation
Mechanical fluctuation of the pointer is usually a symptom of excessive turbulence in the
pipeline. This is frequently caused by valves or fittings installed too close to the meter inlet.
If moving the meter is not practical, snubbers with smaller holes can be installed to increase the mechanical damping of the meter. (Pulsation snubbers are installed standard
on all gas meters and on liquid meters unless ordered with viscosity correction.)
Trouble–
shooting
6.
Correction
Factors
5.2 Zero Shift
The need to frequently rezero the meter is an indication of excessive water hammer . P iping or operating procedures should be changed to reduce water hammer in order to prolong the life of the meter .
5.3 Sluggish Meter Response
Sluggish meter response can be caused by inadequate pointer return spring preload or by
clogging of the pressure passages with debris. To check spring preload, see CHECKING
THE POINTER PRELOAD. To clean the pressure passages, see CLEANING OF PRES SURE PORTS.
6.1 Liquid Service
If the specific gravity of the fluid being metered differs from the value marked on the
meter dial, a correction factor , J , must be applied to the meter reading to obtain the
actual flow rate.
Actual flow rate = J x meter reading
where
Sc = Specific gravity for which meter is calibrated
Sa = Actual specific gravity of fluid being metered
Example:
Meter , calibrated for water (specific gravity = 1.0) reads 12.5 GPM for a lubricating oil
with specific gravity of 0.85. What is the actual flow rate?
Sc
=
J
Sa
10
J == =
Therefore, actual flow = 1.085 x 12.5 = 13.56 GPM
.
085
.
11765 1085
..
Page 7
6.
K
6.2 Compressed Gas Service
If the gas pressure or temperature varies from the values marked on the meter dial, then a
correction factor , K, must be applied to the meter reading to obtain the actual flow rate.
Correction
Factors
(Continued)
where
æ
Pa
+
K
Pa = Actual gas pressure at entrance to meter, psig.
Pc = Calibrated gas pressure marked on the meter dial, psig.
T a = Actual gas temperature at meter, °F
Tc = Calibrated gas temperature marked on meter dial, °F
Example:
Meter calibrated for compressed air at 100 °F and 80 psig. reads 100 SCFM at an
actual temperature of 70 °F and pressure of 85 psig. What is the actual flow rate?
K =
()
=
ç
Pc
+
()
è
æ
85 147
()
ç
80 147
()
è
==
105 106 105.. .
()()
147
147
+
+
ö
æ
Tc
.
÷
.
ø
.
.
+
()
ç
Ta
+
()
è
ö
æ
100 460
()
÷
ç
70 460
()
ø
è
460
460
+
+
ö
÷
ø
ö
÷
ø
7.
Cutaway
View
Therefore, actual flow rate = 1.05 x 100 = 105 SCFM
GEAR
MOVEMENT
HOUSING
INDICATOR
ASSEMBLY
PULSATION
SNUBBERS
METER BODY
FLOW
Cutaway View From Front
Dial Removed
Figure 9
M1 rev G 0101
PRINTED ON RECYCLED PAPER
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