R-700 Series
Glass tube flowmeter with alarm contact

OUTLINE
R-700 series is a glass tube area flowmeter with alarm contact(s).
In addition to local flow rate indication by the position of float, reedswitch alarm contact(s) are actuated at set flow rate.
R-700 is useful and effective for prevention of flow cut-off for coolingwater system efc.

STANDARD SPECFICATION
Available sizes :a. General version R-7□□
65,80 and 100mm(With float guiding road)b. Ribbed tapered tube version R-7 □□-R
10,15,20,25,40 and 50mm
c. Wide designed tapered tube version R-7□□-E
25,40,50,65,80 and 100mm(With float guiding road)
Measuring fluid :Liquids and gases

Fluid pressure :Metersize

Max. fluid press. MPa
R-7 □□

R-7 □□-R

R-7 □□-E

10–

1.2

–

15

–

1–

20

–

0.8

–

25

–

0.8

0.8

40

–

0.6

0.6

50

–

0.6

0.6

65

0.6

–

0.6

80

0.4

–

100

0.4

–

Body :		

SS400*, SCS13, SCS14		

OptionPVC		

*Only R-7□□-E types are available.

Process connection :Standard ;				

JIS10K flange

OptionANSI, JPI, other flange

Flow direction ;		

Standard Bottom→Top (R-7 □1- □)		Option

Bottom→Top side (R-7 □-2-□)

0.4			

Bottom side→Top side (R-7 □3-□)			

Bottom rear→Top rear (R-7 □5-□)

0.4

No.of alarm point :Possible Alarm point

Metersize

R-7□□

R-7□□-R

R-7□□-E

Max.120°C (Allowable thermal shock:80°C)

10–

1×Low + 1×High–NB.1) upto 80°C for NBR gasket version

15–

Fluid temperature:–

1×Low + 1×High

20–

1×Low + 1×High

–

25

–

1×Low + 1×High

1×Low

Indication accuracy :		std. ±1.5% (F.S)*

40–

1×Low + 1×High

1×Low			*±2.5% (F.S) for resin float version

50–

1×Low + 1×High

1×Low
1×Low

2) up to 60°C for PVC body version
It is general data, and the maximum temperature may
change by terms of use and environment.

Range ability :		10 : 165

1×Low

–

Paint color: 		Munsell 7.5BG4/1.5 (except for the SUS body)

80

1×Low

–

1×Low

100

1×Low

–

1×Low

Material :Tapered tube : Heat-resistant glass
Float: Standard For liquids SUS304					Packing		

For gases AluminumOption

SUS316, SUS316L, PVC

Alarm Contact :1) Reed Switch(R-75 □-□): Standard NBR2) Optical Switch(R-76 □-□)Option

Refer to separate explanation for details

FPM, other

TG-F2373-E01
2nd edition Jun 2024 K
1st edition Aug 2023 K

R-700 Series Glass tube flowmeter with alarm contact(Density 1.293kg/m3(nor) ,0°C,1atm). In case the fluid is different

MODEL CODE

from air, and / or operating condition is not under Normal condition,

Model code
R- 75
Type of contact
6a conversion calculation is required. Consult factory for details.

Description

ACCEPTABLE CONNECTION FLANGE SIZES

Reed switch
Optical switch
1Bottom Top
2Bottom Top side
Flow direciton
3
Bottom side Top side
5
Bottom rear Top rear
General purpose
Type of tapered tube - R Rib guided- E Wide designed

Possible connection flange sizes against selected meter size areshown in the following tables.
1)For R-7□□ (General type)2)For R-7 □□-E
and R-7□□-R (Ribbed		
(Wide designed type)tapered tube type)Bodymaterial

Connection flange size
(against meter size)–1±0+1Bodymaterial

Connection flange size
(against meter size)
–1

±0+1

SS400/SGP

SCS14FLOW RATESCS13,SCS141) For Liquid measurement

PVC
Flow rate

R-7□□
General typeMetersize

R-7□□-RRib guided

R-7□□-E
Wide designedWater
m3/hPress Loss(kPa)

10––0.065 to
0.1

2.5

––

15

––

0.4

2.5

––

20

––

1

3.5

––

25

––

1.65

5

3 to 6.5

12

2.5

4

4.3

4

B

40

––

A

Water Press Loss Water
(kPa)
m3/h
m3/h

Press Loss(kPa)

STANDARD GRADUATION
The follwing 17 different standard graduations are ready to choose.
Fix your full scale to meet the availability.

1–10
10815

1.2–12

1.4–14

1.5–151.6–16

1.8–181214151618

10121050

––

6.7

425

1265

9 to 125––

40

1880

21

9––

55

18100

50

19––

80

15General type (R-7□□) and Wide designed type (R-7□□-E) are suitable
only for Water or water equivalent liquid having 1.0 mPa·s viscosity.

8

106

4
2

2.5–2525

30

The figures are indicated by flow rate of Water having Density of 1.0g/cm3

15Press. Loss(kPa)

15

2~7.5

3.5

20

17

2.5

25

28

2.5B

39

3.5

A

85

3130

350

40

30
205 –50

40

Above table shows maximum possible full scale for different meter

7–70

8 –80

6070

50

60

103.5

420

10
4.5

9–90

80

90806060

403030

40

40

2040

20
105

Ribbed tapered tube version(R-7□□-R) is recommended
for gas measurement. Available size is 15 to 50

32.5

6–60

50

105245

20

105

1.8

30

10Air
m3/h (nor)

40

40

10

Flow rate
R-7□□-R(Ribbed tapered tube version)

54.5–453020152) For Gas measurement

Metersize

35

4–40

20

and viscosity of 1.0 mPa·s In case actual operating condition is different
from this, a conversion calculation is required. Consult factory for details.

1.6

1.5

3.5–35

Above table shows maximum possible full scale for different meter sizes
with stainless steel floats.

42
1.4

3–30

10

5

4

2
1.2

18

6

4

20

10

8
62 –20

15
12

20
10
6

7

20
820
9

Graduation examples are for R-7 □□ and R-7□□-R,
They may slightly differ for R-7□□-Esizes with aluminum float.
The figures are indicated by flow rate of Air under Normal condition

2TOKYO KEISO CO., LTD.

TG-F2373-E01

R-700 Series Glass tube flowmeter with alarm contact

DIMENSIONS
Meter size 10 to 40B

R-751, R-751-R

Meter size 40A to 100

Top view

Dimension (mm)Front view

Metersize

LW

Mass(Approx.)kg
1 point alarm 2 point alarm
B

10420

62

90

126

3.5

No.

Parts name

Material

15420

84

99

135

4.5

1

Tapered tube

Heat-resistant glass

20430

94

104

140

5.5

2Float

SUS304, Aluminum, Others

25500

119

117

153

8.5

3Body

SCS14, Others

4Packing follower

SCS13, SUS304

40B500

129

122

158

125Packing

NBR, FPM, Others

40A500

144

129

165

156Column

SUS304

50530

171

143

179

187nut

SS400, SUS304

65530

186

135

171

238Switch

Assembly

80

570

206

144

180

30

9

Terminal Box

ADC12100

590

242

162

198

42R-751-E
Metal Body
Meter size 80A, 100ATop view

Dimension (mm)Front view

Metersize

No.

Parts name

Material

1

Tapered tube

Heat-resistant glass

2

Float

SUS304, Aluminum, Others

3

Body

TG-F2373-E01

Mass(Approx.)
Metal PVC Metal PVC Metal PVC
kg
Body Body Body Body Body Body
LBW

25320

360

102

102

94

106

SGP/SS400, SCS13, SCS14 Others

40370400120120103115

8370

400

144144114

126

126.5

4Packing

NBR, FPM, Others

505Column

SUS30465370

410

160160122

134

136nut

SS400, SUS304

80400

410

180180129

141

177Switch

Assembly

100

400

410

200200139151

208Terminal Box

ADC12TOKYO KEISO CO., LTD.

3

R-700 Series Glass tube flowmeter with alarm contact

ALARM CONTACTS
Reed switch type (R-75 □)ORDERING INFORMATION
ModelQ'ty● Type of switch: Self holding type.			 Normal open or Normal close● Capacity: AC.DC,10W(Resistance load)			 Max.voltage AC 120V, DC 170V			 Max.Current AC 0.25A, DC 0.25A● Setting Accuracy: ± 2% F.S. (Against flow calibration)● Reset span

: ≦15% F.S. (R-75□, R-75□-R)

Fluid nameDensity
Viscosity
Pressure
Temperature
Scale range
Alarm setting point □ LO__________			≦20% F.S. (R-75□-E)

ActionLO □ Open □ Close for decreaseHI □ Open □ Close for increase

Material

Body
Float
Gasket			 (Against flow calibration)● Enclosure: Splash-proof

Optical switch type (R-76 □)● Output: Max. sink current 80 mA (30V DC)● Operation: Dark ON (Open collector ON when light is● Response time

: 0.5 msec or less

● Power supply: 24V DC ± 10% (Power ripple : max. 10%)shielded)● Power consumption : Projector 15 mA or lessReceiver 22 mA or less

●Photosensitivity adjustment		: Included●Operation display: Operation indication (Red LED)		
●Connection

Stability indication (Green LED)
: C able pullout type (Cable outer diameterø2.8 mm)		

Cables		

Projector 0.15 mm2 two-core cable, 2 m (Gray)		

Receiver 0.15 mm2 three-core cable, 2 m (Black)●Structure: Waterproof hermetic (Equivalent to IP64)●Material: Case (Liquid crystal polyester/Polypropyl-●Ambient illuminance: 3,000 lux or lessene filler)●Ambient temperature : −25 to +55ºC (No freezing)●Ambient humidity____________________________________

Specialinstruction: Open collector (NPN)● Output rating		

□ HI__________: 85%RH or less (No condensation)

Cautions on the use of glass tube variable area flowmeters

CAUTION
Avoid the use of glass tube variable area flowmeters for the following
services.
1. Liquid services subject to impulse pressure in the process.
2. Secondary accidents might occur due to the breakage of glass insuch services :• Toxic fluids such as poisons, stimulant and narcotics• Flammable fluids• Explosive fluids
3. Gas handling process where breakage of glass might result in gas
leakage or scattering of glass fragments.
4. The installation places of the flowmeters where breakage of glass
might be caused by the accidents from the surrounding piping orequipment.
5. On-off operation where breakage of glass might be caused by thecollision of the float inside meter due to the abrupt change of flow.
6. Services where the heat shock by abrupt change of temperature isexpected.

* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : https://www.tokyokeiso.co.jp
4TG-F2373-E01