Oval PG30 Manual de usuario

Ins. No. T-518-11-E

NONCONTACT PULSE GENERATORS　

MODEL PG30/PG30EP

MODEL PG30

MODEL PG30EP

GB type

Where pulses of scaled units or

unscaled pulses are required

Pulse generator

for totalizer

LW13 type CB type PB type

Meter sizes 52 or 53;

where pulses in scaled

units are required.

If unscaled pulses

uncompensated for

temperature are re-

quired, it is mounted to

the area encircled ( ○ )

of transmission gear

box GB.

Equipped with regis-

ter Model LW11;where

pulses of scaled units

compensated for tem-

perature are required.

Equipped with regis-

ter Model LW42 or

43;where pulses of

scaled units com-

pensated for tem-

perature are required.

Pulse generator

for totalizer

■GENERAL

When used in conjunction with an OVAL flowmeter, the Model PG30/

PG30EP noncontact pulse generator provides voltage frequency pulses

proportional to the flowrate of process fluid. Incorporated in the pulse

generator are a premolded pulse generating element and a circuit

which prevents false pulses otherwise generated by minute vibration

of generator components. As the toothed disk rotates, a succession of

voltage pulses (quasi rectangular wave) is generated.

Generated pulses come either pulses in scaled units or unscaled

pulses, depending on the position of ﬂowmeter at which the generator

is mounted. Pulses in scaled units can be used in remote totalizing,

batching, blending systems and the like built around an OVAL ﬂowmeter

which serves as the sensing terminal. Unscaled pulses are converted

into an analog signal for use in flow indicator/recorder/controller

applications. Models PG30S/PG30SEP are compatible in the latter

applications.

★For complete details of Models PG30S/PG30SEP,see OVAL Products

General Speciﬁcations GS No T-523-E.

Pulse generators come in the following two designs:

(1)Standard type……PG30

(2)Flameproof type…PG30EP (designed and fabricated according to the "Explosionproof Guide-

lines" recommended by the Technology Institution of Industrial Safety.)

★Information about Models PG30S and PG30SEP appears in Instruction Manual No. T-523-E.

■PULSE GENERATOR INSTALLATION EXAMPLES

Generated pulses in scaled units…The rotor revolution is guided into gear reduction and instrumental

error correction stages for the ﬂowmeter to produce pulses of required scaled unit. The obtained pulse

signal is used primarily for remote totalization.

T-518-11-E

Receivecoil

Sendcoil

Waveform

Tootheddisk

Oscillator Detector Recti-

ﬁer

Wave-

shape

L1L2

① ② ③ ④ （BLK）

（WHT）

Power+12V

OutputSIG

Power0V

（RED）

Send

coil

Receive

coil

Output

（Output =V1XORV2）

Tootheddisk

V2 V2

Fig. 1 Fig. 2

■WIRING INSTRUCTIONS

1. Cables for eld wiring

Recommended cables for ﬁeld wiring are 3-conductor, shielded, chloroprene cabtyre cables [kind 2] (JIS C

3311) or 2-conductor, shielded, vinyl cabtyre cables (JIS C 3312) 1.25mm2to 2.0mm2in conductor area unless

otherwise speciﬁed.

2. Transmission Length

The maximum Transmission length is one kilometer when cables 2mm2in conductor area conforming to JIS C

3311 or C3312 are used.

NOTE: If it exceeds one kilometer, consult the factory.

3. Conduit work is suggested.

Cable connections: PG30 ……Rc (PT) 3/4 female

PG30EP…G (PF) 3/4 female

NOTE: With conduit, a minimum of ﬁve full threads should engage the mating thread.

Wiring connections

Remove the lid of PG30/PG30EP housing to gain access to

a 3-post terminal block. Terminal identiﬁcation label is found

on the reverse side of the lid. Remove a wiring connection

instruction label put on the terminals.

1 →+12V WHT

Terminal No. 2 →SIG RED

3 →0V BLK

If grounding at the pulse generator end is desired 

With PG30EP, use the earth ground terminal furnished.

With PG30, no ground terminal is provided; take off a screw

as shown in Fig 3 and earth ground using a terminal lug.

■OPERATING PRINCIPLE

1. Operation can best be understood by referring to Fig.1. Oscillator coil L1in the HF oscillator continuously

generates a 1MHz high frequency wave (waveform ①). As a toothed disk, located between the coil and

detector rotates, a high frequency induction field created is intermittently interrupted. The resultant signal

induced in pickup coil L2of detector is a wave modulated by the toothed disk (waveform ②). The signal is

then detected(waveform ③) and further shaped into a rectangular signal (waveform ④).

Hysteresis characteristics are also provided electrically by changing trigger levels at the leading edge and

trailing edge of the signal.

2. Fig.2 shows how our proprietary double pulse generator works. With two pairs of HF send/receive coils

arranged opposite to each other, intermittent interruption of the magnetic field takes place by the rotating

toothed disk and causes each coil to produce a single pulse per gap (or slot) between the teeth.

Because two coils are so located as to produce pulses 90°out of phase from each other, by exclusive OR (XOR)

of pulses from these two coils, two pulses per gap between the teeth are obtained after all.

Ground this terminal if

required.

Fig. 3

4. Conduit work for Model PG30EP (ameproof type)

(1) Use steel conduit conforming to the requirements speciﬁed in JIS C 8305.

(2) Conduit accessories should be of ﬂameproof rating.

(3) Sealing work should be taken into consideration.

(4) Where rusting the screw threads is anticipated, apply a coat of non-drying sealing compound externally

following the screw engagement of conduit.

5. Inductive Interference Prevention

Field wiring should be routed sufﬁciently away from existing power cables or power circuits, if any, to prevent

potential stray current pickup.

If you want to use both scaled unit pulses and unscaled pulses, use two separate cables.

T-518-11-E

SIG0V

MODEL

PG30, PG30EP

12VDC

+12V

10kΩ



＋

103 102

116

119

139

Fig. 5Fig. 4

167

Transmission gear box

PG30 PG30

Fig. 7Fig. 6

Shown in Fig.6 above is the setup for observing the

output pulse waveform. Couple the oscilloscope

across terminals a and b and monitor the waveform

while allowing the pulse generator to rotate at a

constant rpm. Connecting the voltmeter across

terminals a and b enables you to make an ON/OFF

level measurement. However, you cannot make a

pulse ON/OFF ratio (or duty factor) measurement with

voltmeter alone.

Correct ON/OFF ratio C/D ranges from 35/65 to 60/40

when "1"= 6.2 to 7.6V and "0"= 0.5 max.

If a correct waveform like the one shown in Fig.7 is

not obtainable, replace the noncontact switch unit with

a new one according to the procedure outlined in the

next section.

(The ON/OFF ratio is a value measured under steady

state rotation.)

■DISASSEMBLY AND INSPECTION　

◎The pulse generator should be disassembled for inspection once a year.

(Make sure that the transmitter cables are not lodged between the casing parts while reassembling.)

If there is no or few (or too many) pulses from the pulse generator while the ﬂowmeter register pointer moves or

the counter operates properly, trouble is suspected in the pulse generator. Inspect its components according to

the procedure described below.

1. Remove the pulse generator from the flowmeter.

Take off four screws (167) to gain access to the

transmission gear box. Check for any gear slipping

on its shaft or crimp connections that are loose.

The same procedure applies to Model PG30EP.

CAUTION: If something is wrong with spring (122) and/or brake shoe (119), replace the whole brake

shoe assembly (plate (120) inclusive).

●Monitoring the Output Waveform

2. Take off four screws (139) holding the housing lid

(102) in place and remove the lid.

Check to see that toothed disk (116) turns smoothly

and that the brake shoe (119) works properly.

T-518-11-E

109

108

110

111

126 118 115

Terminal box

117

PG30 PG30EP

※

116

※

Gear Train Bearings Brake Shoe

Spur Bevel Plain Ball

G2 G2 L3 L3 L3

Symbol Viscosity or Consistency Pour Point or Drop Point Example of Products by Trade Name

L3 36.4cst/30℃ − 37.5℃Nisseki Launa 40

(Nippon Oil Co., Ltd.)

G2 300/25℃300℃and above

Jun BG Grease

(Nihon Tokushu-koyu Co., Ltd.)

● Lubricating Oil Specications and Examples of Products

■LUBRICATION

Do not fail to use proper lubricants shown below, or equivalent, at disassembly and inspection.

L: Lubricating oil

G: Grease

●Noncontact Switch Unit Replacement

Fig. 9

Fig. 8

1. Disconnect wiring connections. Take off two

terminal ﬁtting screws (106) and remove terminals

(104). The noncontact switch unit (108) can be

separated by taking off two additional screws (130).

2. Remove nut (110) and toothed washer (109)

holding the noncontact switch unit (108) to

mounting bracket (111), and remove the switch

unit. Install a new switch unit in alignment with

locating slot (marked ※). Ensure correct wiring

connections with due regard to color coded leads

(white, red and black).

1. Take off four bolts (329) and remove the casing

of pressure-resistant gasket (301) from housing

(101). Then, take off two screws (126) securing the

noncontact switch unit (115) in place and remove

the switch unit.

2. Unsolder wire lead connections (marked ※), take

off nut (117) and toothed washer (116) holding the

noncontact switch unit (115) to mounting bracket

(118), and separate the switch unit.

Replace with a new noncontact switch unit in the

same manner as described for PG30 pulse generator

and solder wire leads to their connections.

T-518-11-E

Transmission gear engagement in the

transmission gear box shipped from our factory

before April, 1987, is as shown in the inset.

Pulse Generator Assembly

Sym.No. Part Name Q 'ty

101 Housing 1

102 Housing lid 1

103 Housing lid bolt (M3×15) 4

104 O-ring (JIS G70) 1

105 Washer, Housing lid (M5) 4

106 Shaft 1

107 Ball bearing (L-1040ZZ) 2

108 Blind plug (Rc(PT)1/8, hex. socket

head) 1

110 Setscrew (M3×4) 1

111 Toothed disk (with hub) 1

112 Thrust spacer 1

114 Holder 1

115 Detector (noncontact switch unit) ｝

1set116 Toothed washer, Detector

117 Nut, Detector

▲：Replacement parts

Sym.No. Part Name Q 'ty

118 Mounting bracket, Detector 1

119 Brake shoe

　▲

｝

1set

120 Plate

121 Shoe shaft

122 Spring

123 Clip ring

124 Thrust spacer 1

126 Fitting screw, Detector mounting

bracket (M4×8) 2

127 Washer, Detector mounting

bracket (M4) 2

128 Plate ﬁtting screw (M3×6) 2

129 Washer, Plate ﬁtting screw (M3) 2

130 Holder ﬁtting screw (M4×6) 2

131 Washer, Holder ﬁtting screw (M4) 2

Mounting Bracket Assembly

Sym.No. Part Name Q 'ty

201 Mounting bracket 1

202 Bearing 1

203 Transmission shaft 1

204 Bevel gear 1

205 Coupling 1

Sym.No. Part Name Q 'ty

206 Coupling retaining pin 2

207 Fitting bolt, Mounting bracket 4

208 Thrust seat 1

209 Gasket, Mounting bracket 1

210 Oil retaining bearing 2

Once disassembled, apply a liquid sealant

(Hermeseal ＃723, or equivalent).

■ ASSEMBLY DRAWING AND PARTS LIST, PG30EP

T-518-11-E

Transmission Gear Box

Sym.No. Part Name Q 'ty

150 Transmission Gear Box 1 set

162 Ball Bearing B (LF1260ZZ) 1

167 Fitting Screw, Transmission Gear

Box 4

NOTE: Shaded area in the drawing

A replacement transmission gear box is available as

an assembly. When ordering this box, please specify

the gear ratio (e.g., 1/10 or 1/1) stamped on its plate.

Terminal Box Assembly

Sym.No. Part Name Q 'ty

301 Pressure-resistant packing casing 1

302 Pressure-resistant packing 1

303 Pressure-resistant packing washer 1

304 Pressure-resistant packing retainer 1

305 Terminal box housing 1

306 Terminal box housing lid 1

307 Fitting bolt, Terminal box housing

lid 4

308 O-ring (JIS G70) 1

309 Bolt, Terminal box housing

(M5 ×12) 4

310 Washer (M5) 4

311 Ground terminal screw (M4×8) 2

312 Washer (M4) 2

313 Crimp terminal (φ4) 8

314 Terminal block 1

Sym.No. Part Name Q 'ty

315 Flameproof enclosure rating

nameplate 1

316 Hex bolt for terminal (M4×18) 3

317 Washer (M4) 6

318 Washer (M4) 3

319 Nut (M4) 9

321 Terminal block ﬁtting screw

(M4×10) 2

322 Washer (M4) 2

323 Washer, Terminal box housing lid

(M5) 4

325 Wiring instruction label 1

326 Pressure-resistant packing retain-

ing bolt (M5×15) 4

327 Washer 4

328 Cabtyre cable 1

329 Bolt, Pressure-resistant packing

casing (M5×12) 4

330 Washer (M5) 4

Ordering Instructions: Please supply us with the details of your order, which should include the owmeter

model, product No., Instruction manual No., symbol No., quantity desired, and part

name.

Transmission gear engagement in the transmission

gear box shipped from our factory before April,

1987, is shown in the inset.

Transmission gear box (150) and mounting bracket (200)

are also shared by PG30EP; see pages 5 and 6.

T-518-11-E

Pulse Generator Assembly

Sym.No. Part Name Q 'ty

101 Housing 1

102 Housing lid 2

103 Gasket, Housing lid 2

104 Terminal 1

105 Nut, Terminal (M4) 3

106 Screw 3

107 Washer 3

108 Detector (noncontact switch unit) ｝

1set109 Toothed washer, Detector

110 Nut, Detector

111 Mounting bracket, Detector 1

112 Crimp terminal 6

114 Holder 1

115 Shaft 1

116 Toothed disk (with hub) 1

118 Ball bearing (CF-1040ZZ) 2

119 Brake shoe

　▲

｝

1set

120 Plate

121 Shoe shaft

122 Spring

123 Clip ring

▲：Replacement parts

Sym.No. Part Name Q 'ty

124 Thrust spacer 1

125 Blind plug

(PT1/8, hex socket head) 1

126 Terminal identiﬁcation label 1

127 Wiring instruction label 1

129 Toothed disk setscrew (M3×4) 1

130 Fitting screw, Detector mounting

bracket (M4×8) 2

131 Washer, Detector mounting

bracket (M4) 2

132 Plate ﬁtting screw (M3×6) 2

133 Washer, Plate ﬁtting screw (M3) 2

134 Holder ﬁtting screw (M3×6) 2

135 Washer, Holder ﬁtting screw (M4) 2

136 Terminal ﬁtting screw (M4×10) 2

137 Washer Terminal ﬁtting screw (M4) 2

139 Housing lid bolt (M4×12) 8

140 Housing bolt (M5×12) 4

■ ASSEMBLY DRAWING AND PARTS LIST, MODEL PG30

T-518-11-E

Model

Item PG30 PG30EP

Output

pulses

System of

units

Model PG32 PG33 PG32EP PG33EP

Pulses per

revolution 100 P/rev 1000 P/rev 100 P/rev 1000 P/rev

Reduction gear ratio 2/1 20/1 2/1 20/1

Pulse generation HF generation and single pulse detection (3-wire system)

Certiﬁed explosionproof rating Standard Flameproof

Explosionproof rating d2G4

Cable entry Rc (PT) 3/4 female G (PF) 3/4 female

Operating temperature range −20℃to +80℃

※Standard supplies (DC power supplies) are available from OVAL. You can use one if required.

■GENERAL SPECIFICATIONS

Number of gear teeth (toothed disk) 25 pole

Pulse generator unit Type SHW - 1001

Color Green

Power Source ※12VDC ±10％

Current drain 30mA max.

Output signal levels "0"= 0.5V max.

"1"= 6.2 to 7.6V (across 10kΩresistive load)

Maximum operating frequency 2.5kHz (at sensing terminal)

Transmission length 1 kilometer max.

Output waveform Quasi rectangular wave ("0" / "1"= 35/65 to 60/40)

Hysteresis width 0.5mm min.

Electrical speciﬁcations

T-518-11-E

2014.11 Revised

2009.12 Revised △

T-518-11-E（2）

All specifications are subject to change without notice for improvement.

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