Cat.No. B04-23-C

GC51
Pressure Transmitter

Fluids and gases measurement(Featuring stainless diaphragm)

Overview
This pressure transmitter is for gases and liquids
measurements with 2-wire system. Compact andlightweight design suitable for outdoor use for awide range of industries including HVAC, Factory
automation, Process and Water treatment
contributing for easy installation on site.
Direct connection typeFeatures・Adjustable indication and output scaling areavailable.
・Breakthrough readability with LED-backlit LCD
・Small and lightweight design with 4-way pressure
port directions: upper, lower, left and right(Lower, left and right for absolute model).
Terminal box typeCompatible with a wide range of pressure ranges from low,
medium to high pressure including absolute pressure!
Features of sensor

Absolute pressure and low pressure range

Medium pressure to High pressure

Stainless steel seal diaphragm sensor

Semiconductor evaporated type (SS) Sensor

This pressure transmitter utilizes sealed-type
pressure sensor made of SUS316L for all its
wetted parts. MEMS sensor element built inthe sensing part can measure absolute andlow pressure with SUS316L diaphragmsensing part enclosing silicone oil forintermediary liquid. Suitable for high stable
and accurate pressure measurement forgases and liquids measurements requiringhigh corrosion resistance.

The semiconductor evaporated type(SS) sensor is proven in various
industries that has the integral structure
the semiconductor strain gauge,sensing part and connection are allwelded without using glue or corrosive
material. This makes it suitable forvarious process media measurements
including liquids and gases with highdurability and stability.

Absolute pressure
00 to 120kPa abs.

Low pressure−100kPa0300kPa

Medium pressure to High pressure
0.1MPa120MPa

GC51
Pressure Transmitter

Absolute pressure・Low pressure (Stainless-sealed diaphragm)
Absolute pressure
0 to 120kPa abs.

0Low pressure−100kPa

0300kPaSpeciﬁcations
Item

Description

Media

Gases or Fluids (not corrosive to the wetted material)

Mounting

Direct mounting
Pressure inlet: Lower, Left, Right
Panel mounting
Pressure inlet: Lower (with mounting bracket, mounting screw)
Terminal box type
Panel mounting (Pressure inlet: Lower Terminal box at right with mounting bracket, mounting screw)

Pressure connection

Rc1/4
G1/4 female screw

Wetted parts

Diaphragm: SUS316L
Fitting: SUS316L

Filled liquid

Silicone oil

Pressure range

0 to 35kPa-20 to 20kPa
0 to 50kPa-50 to 50kPa-100 to 0kPa
0 to 100kPa-100 to 100kPa-100 to 200kPa
0 to 200kPa-100 to 300kPa
0 to 300kPa

Output accuracy＊1, ＊2±0.35％F.S. at 23℃±0.25％F.S. at 23℃

Indication accuracy＊1, ＊2±(0.35％F.S.+1digit) at 23℃±(0.25％F.S.+1digit) at 23℃

Allowable maximum
pressure

100kPa200kPa

400kPa1000kPa

Allowable vacuum
pressure

130Pa abs. and above

Position eﬀect＊1

30Pa and below / 90°

Enclosure rating

Case material: Aluminum die castProtection: P65

Installation location

Outdoor installation (Avoid direct sunlight)

CE marking

Applicable Standard EN61326-1: 2006, EN61326-2･3: 2006

WeightDirect mounting: Approx. 450g, Panel mounting : Approx. 550g, Terminal box type: Approx. 630g

Power source

24V DC±10％

Output4 to 20mA DC (2 wire system, Output range: 3.2 to 20.8mA DC)
Response time: 30ms (with no ﬁlter setting)
Resolution: 0.1％F.S.
Load resistance: 500Ω max.

Guaranteed accuracy＊1Operating temperature range (-20 to +70℃)±2.0％F.S. (Output), ±(2.0％+1digit) (Display)

Insulation resistance

50V DC 100MΩ or more

Outlet for electric wire

Direct mounting: SKINTOP R MS-SC13.5
Terminal box type: Cable gland FBA21-13 G1/2

Operating temperatureand humidity-20 to 70℃, 10 to 85％RH (No freezing or condensation)

Storage temperatureand humidity-25 to 75℃, 10 to 85％RH (No freezing or condensation)

Vibration resistance

10 to 150Hz, multi-amplitude 0.7mm (Lower than 60Hz)
Acceleration: 50m / s2 (60Hz or more)
Vibrating direction: x, y, z (2.5 hours for each)

Shock resistance

Impact acceleration: 100m / s2
Impact direction: x, y, z (3 times into forward and backward directions for each)

Output adjustment range

Zero point : -10 to +110% of the full span (To pressure range)
Span point: -10 to +110% of the full span (To pressure range)

Numeric display

Six-digit LCD (Character height: 10mm, with LED backlight)
Pressure display, Linear display: Four LCD digits max., Display cycle 500ms

Unit display

LCD bar display (with LED backlight)
Pressure unit: kPa, Linear unit: Arbitrary set

SettingWith internal key switches (Mode, ▲, ▼)Scaling function: Linear display / output
Holding function: Both the max value (Peak) and the minimum value
Filter function: Moving average time, Select from 0, 2, 4, 8, and 16
Loop check function: Arbitrary setting output (4 to 20mA DC)
Zero adjustment function: Pressure sensor zero adjustment

OthersSet value and hold value can be saved in EEPROM (Nonvolatile memory) semi-permanently.
＊1 Based on speciﬁcation that electrical wire outlet is located at lower.
＊2 It includes the eﬀect of Linearity, Hysteresis and Repeatability at 23℃ environment temperature.

20 to 120kPa abs.

200kPa abs.

GC51
Pressure Transmitter

Medium to high pressure range (Semiconductor evaporated type (SS) Sensor)
Medium pressure to High pressure
0.1MPa120MPaSpeciﬁcations
ItemOthers

Media

Gases or Fluids (not corrosive to the wetted material)

Mounting

Direct mounting
Pressure inlet: Lower (Standard), right upper and left
Direct mounting
Pressure inlet: Lower (with mounting bracket, mounting screw)
Terminal box type(Pressure inlet: Lower Terminal box at right with mounting bracket, mounting screw)

Pressure connection

Rc1/4 (50MPa and below, standard)
Rc1/2 (Rc1/4+FJ10-973 Conversion joint, optional for 50MPa and below)
G3/8B (Rc1/4+FJ12-373 Conversion joint, optional for 50MPa and below)
G1/2B (Rc1/4+FJ12-473 Conversion joint, optional for 50MPa and below)
G1/4(Rc1/4+FJ12-373 Conversion joint, optional for 50MPa and below)

Wetted parts

Diaphragm: SUS630 (17-4PH)
High corrosion-resistant material (Co-Ni alloy)※1Fitting: SUS316

Pressure range-0.1 to 0.1, 0.2, 0.3, 0.5, 1.0MPa
0 to 0.3, 0.5, 1, 2, 3.5, 5, 10, 20, 35, 50, 70, 100, 120MPa

Output accuracy±0.25％F.S. or ±0.5％F.S. at 23℃ (0.5 to 50MPa)±0.5％F.S. at 23℃ (70, 100, 120MPa)±0.5％F.S. or ±1.0％F.S. at 23℃ (0.3MPa and below)

Indication accuracy±(0.25％F.S.+1digit), ±(0.5％F.S.+1digit) or ±(1.0％F.S.+1digit) at 23℃(Same as output accuracy)

Allowable maximum
pressure

200% of pressure range(150% for 35 and 50MPa. 120% for 70, 100, 120MPa range)

Enclosure rating

Case material: Aluminum die castProtection: IP65

Installation location

Outdoor installation (Avoid direct sunlight)

CE marking

Applicable Standard EN61326-1: 2006, EN61326-2･3: 2006

WeightDirect mounting: Approx. 450g, Direct mounting: Approx. 550g, Terminal box type: Approx. 630g

Power source

24V DC±10％

Output4 to 20mA DC (two wires, Output range: 3.2 to 20.8mA DC)
Response time: 30ms (with no ﬁlter setting)
Resolution: 0.1％F.S.
Load resistance: 500Ω max.

Guaranteed accuracy

Operating temperature range (-20 to +70℃)±1.0％F.S. (0.5MPa and above), ±2.0％F.S. (0.3MPa and below)

Insulation resistance

50V DC

Outlet for electric wire

Direct mounting, Direct mounting: SKINTOP R MS-SC13.5
Terminal box type: Cable gland FBA21-13 G1/2

Operating temperatureand humidity-20 to 70℃, 10 to 85％RH (No freezing or condensation)

Storage temperatureand humidity-25 to 75℃, 10 to 85％RH (No freezing or condensation)

Vibration resistance

10 to 150Hz, multi-amplitude 0.7mm (Lower than 60Hz)
Acceleration: 50m / s2 (60Hz or more)
Vibrating direction: x, y, z (2.5 hours for each)

Shock resistance

Impact acceleration: 100m / s2
Impact direction: x, y, z (3 times into forward and backward directions for each)

Output adjustment range

Zero point : -10 to +110% of the full span (To pressure range)
Span point: -10 to +110% of the full span (To pressure range)

Numeric display

Six-digit LCD (Character height: 10mm, with LED backlight)
Pressure display, Linear display: Four LCD digits max., Display cycle 500ms

Unit display

LCD bar display (with LED backlight)
Pressure unit: kPa, Linear unit: Arbitrary set

SettingWith internal key switches (Mode, ▲, ▼)Scaling function: Linear display / output
Hold function: Holds measured maximum and minimum values
Filter function: Moving average time, Select from 1, 2, 4, 8, and 16
Loop check function: Arbitrary setting output (4 to 20mA DC)
Zero adjustment function: Pressure sensor zero adjustment

OthersSet value and hold value can be saved in EEPROM (Nonvolatile memory) semi-permanently.

100MΩ or more

※1 Consult us for high corrosion resistant material (Co-Ni alloy).

3GC51Pressure Transmitter

Dimensions

Unit: mm
(92)

Direct mounting

15(58)

203×M4

NAGANO KEIKI

2510(85)41.5

MPa kPa0φ65

GC51

LC

17.5

Outlet for electric wire
Conforming cable diameter: 9 to 12 mm

Rc1/4 or G1/4
Pressure connection
22×25.4 Hex.

GC51-1□□

46.5

Panel mounting type70(104)4×φ4.5
Mounting bracket t2.0

60

1280

70

GC51

MPa kPa0

NAGANO KEIKI(27)

Outlet for electric wire
Conforming cable diameter: 9 to 12 mm(58.5)

Rc1/4 or G1/4
Pressure connection

GC51-2□□Terminal box type
4×φ4.5
Mounting bracket t2.07060

1250

MPa kPa0

NAGANO KEIKI

(59)

8070

GC51(60)

17.5(27)

Outlet for electric wire
Conforming cable diameter: 9 to 14 mm

GC51-T□□

4(58.5)

Rc1/4 or G1/4
Pressure connection

GC51
Pressure Transmitter

Mounting
Direct connection type is available in several installtion directions (Specify when ordering)

Absolute pressure and low pressure range(Direct connection type available in three installtion directions)

Pressure inlet: Right

Pressure inlet: Left

GC51-A□□

GC51-C□□

Pressure inlet: Lower Pressure inlet: Upper(standard)
GC51-1□□

GC51-B□□Range between medium and high pressures(Direct connection type available in four installation directions)

Function(Panel display)
CH+CH-GC51
Pressure display
linear scaling display

MPa

Pressure unit

kPaScaling
Arbitrary unit

NAGANO KEIKI
M

MODE key

DOWN key UP key①LCD display
Breakthrough readability with LED-backlit LCD②Scaling function
The linear scaling function allows the user for display/analog output of the scaling value where the pressure
is linearly converted to an arbitrary physical quantity.
③Zero adjustment function
Zero point adjustment of 4 to 20mA DC output is available by easy key operation.
④Loop check
The user can output and verify 4 to 20mA easily without applying pressure.
⑤Filter Function
Pulsation and other diﬀerential pressure change can be eased by moving average function where the pressure
value can be ﬂuctuated.
⑥Hold display
The maximum and minimum values of the measured value are displayed.

● Structure of display panel
The user can adjust the display in 90 degreeincrements by removing front cover.

LCD holderCase5

GC51
Pressure TransmitterWiring
Direct connection type
Panel mounting type＋Transmission cable

Receiver＋−＋−

Power source
24V DC−Power terminalblock

Display unit (board)

Shielded〈Attention for shielded wire〉
Please connect shielded wire withone-point ground in consideration of theground state.

Power terminal block−＋＋

Frame ground (FG)Power source (−)
Power source (＋)

FG

Terminal box type

ReceiverTransmission cable＋−

Power source
24V DC−！ CAUTION•Please use the transmission cable after routing it independently away from the high current electrical line
and conﬁrm that there is no malfunction due to noise.
•If the cable outer diameter does not conform to speciﬁcation, water and dust will penetrate because nosealing eﬀect is obtained. Please be sure to use a cable with suitable outer diameter.
•Transmission cable installed into the cable gland must be slacked at the position lower than the cablegland connection in order to prevent the inﬁltration of water into the unit inside.

Transmission cable
Ensure to use an adapted cable for the power supply terminal level and a cable gland.
Terminal box
Model number / Manufacture

Adaptable transmission cable

Direct connection type
Panel mounting type

SMKDSP1.5/2-5.08Phoenix contact

・2 core shield cables＊1
・Cable outer diameter: 9 to 12mm
・Core Line cross-section area: 0.3 to 2mm2 (Standard or a Single line)

Terminal box type

OTB-760-B-3P-M4
OSADA Co., Ltd.

・2 core shield cables＊1
・Cable outer diameter: 9 to 14mm・Core Line cross-section area: 0.25 to 1.65mm2 (Standard or a Single line)＊1 With a twist and a shield, noise-resistant level is improved.
＊2 Depending types of used crimp terminal

Direct connection type
Panel mounting type

60 to 70mm

5 to 6mm
Twist wire lightly for stranded wire.

No cable should be exposed.

60 to 70mm

5 to 6mm

Terminal box type
Crimp terminal(JIS C2805 R type 1.25-4 or equivalent)

Attention) Make sure not to expose shielded wire if the groundconnection using Flame ground (FG) is unnecessary.
Crimp a terminal connector twisting shielded wires only
when pressure transmitter itself needs ground-connected.

6

GC51
Pressure Transmitter

Absolute pressure・Low pressure (Stainless-sealed diaphragm)
Model number configuration 1

Please specify the model number, each specs and the range for ordering.

ModelG C 5 1

8Pressure Transmitter(Absolute pressure・ Low pressure)

1 1③④①②1

Direct connection type2

Panel mounting type Pressure inlet: Lower side(with mounting bracket, mounting screw)(Internal terminal connection)

Model number

⑤⑥0

⑦⑧⑨

Product speciﬁcations①
Mounting type

⑩⑪

⑫⑬

⑭⑮

Additional speciﬁcations (Optional)

Pressure inlet: Lower side

(Internal terminal connection)

ADirect connection typePressure inlet: Right side

(Internal terminal connection)

CDirect connection typePressure inlet: Left side

(Internal terminal connection)

TTerminal box type (Panel mounting type)(Pressure inlet: Lower side Terminal box at right with mounting bracket, mounting screw)②Connection ＊1

7

Rc1/4

P

G1/4 Female screw
8③
Wetted parts

Please specify pressure
range and unit of measure
along with correspondingordering code.

Diaphragm: SUS316L
Fitting: SUS316L④
Pressure range

Range

Digits7-20 to 20kPa

8

Available accuracy±0.25％F.S.

±0.35％F.S.

-20.00−○-50 to 50kPa-50.00○−P-100 to 0kPa

-100.00○−

1-100 to 100kPa

100.0

○

−

2

-100 to 200kPa

200.0

○

−

3-100 to 300kPa

300.0○−X0 to 35kPa

35.00

−

○

W

0 to 50kPa

50.00

−

○

A

0 to 100kPa

100.00○−B

0 to 200kPa

200.0

○−

C

0 to 300kPa

300.0

○−

Z

0 to 120kPa abs.

120.00○−⑤Accuracy(Depending onpressure range)

4±0.25％F.S. at 23℃

T±0.35％F.S. at 23℃

1⑥Power source

24V DC ±10％1⑦Output⑧
Outlet for electricwire

4 to 20mA DC (2 wire system)

Direct connection type, Panel mounting type
1Terminal box type (Panel mounting type)A＊1 If conversion joint is the requirement,
specify the connection size and material＊Specify code "X" to refer N/A

7

Cable gland FBA21-13 G1/2

⑨Additional spec.

0

Not required⑩Treatment0

Not required1

Use no oil

2

Use no water

3

Use no oil & water

Treatment against wetted parts■Use no oil
Oil used in manufacturing the gauges had been
ﬂushed out & no oil residue remained inside its wetted parts.
■Use no water
Water used in manufacturing the gauges had been
ﬂushed out & no water residue remained inside its wetted parts.
■Use no oil & water
Oil/Water used in manufacturing the gauges had been
ﬂushed out & no oil/water residue remained inside its wetted parts.

SKINTOP R MS-SC13.5⑮
Documents

0Not required

1Required(Documents available upon request)

Datasheet (Drawing / Speciﬁcations)
Instruction manual
Calibration test report (One-part one sheet)
Inspection / Traceability certiﬁcate

GC51
Pressure Transmitter

Medium to high pressure range (Semiconductor strain gauge pressure sensor)
Model number configuration 2

Please specify the model number, each specs and the range for ordering.

ModelG C 5 1

1 1

Pressure Transmitter

①②

③

④

Model number⑤⑥⑦⑧⑨Product speciﬁcations①Mounting type⑩⑪⑫⑬⑭⑮Additional speciﬁcations (Optional)

1＊1 Direct connection type Pressure inlet: Lower side (Standard)(Internal terminal connection)

2

Panel mounting type Pressure inlet: Lower side (with mounting bracket, mounting screw) (Internal terminal connection)A

Direct connection type Pressure inlet: Right side (Special)(Internal terminal connection)

B

Direct connection type Pressure inlet: Upper side (Special)(Internal terminal connection)

CDirect connection type Pressure inlet: Left side (Special)(Internal terminal connection)

TTerminal box type (Pressure inlet: Lower side Terminal box at right with mounting bracket, mounting screw)②Connection

7G3/8 (with Rc1/4+FJ12-373, Option) ＊2

4

G1/2 (with Rc1/4+FJ12-473, Option) ＊2

9

Rc1/2 (with Rc1/4+FJ10-973, Option) ＊2

PG1/4 Female screw③
Wetted parts

Please specify pressure
range and unit of measure
along with correspondingordering code.

Rc1/4 (Standard)

350MPa or lesscan be selected

3

Diaphragm: SUS630 (17-4PH) Fitting: SUS316

6High corrosion resistant material (Co-Ni alloy) ＊3④Pressure range

Maximum
display value

Range

Available accuracy±0.25％F.S. ±0.5％F.S. ±1.0％F.S.

1-0.1 to 0.1MPa

0.100

−

○

○

2-0.1 to 0.2MPa

0.200

−

○

○

3-0.1 to 0.3MPa

0.300

−

○

○

5-0.1 to 0.5MPa

0.500

○

○

○

6-0.1 to 1.0MPa

1.000

○

○−

C

0 to 0.3MPa

0.300

−

○

○

E0 to 0.5MPa

0.500

○

○−

G

0 to1MPa

1.000

○

○

−

J

0 to2MPa

2.000

○

○−

K

0 to 3.5MPa

3.50

○

○−

L

0 to5MPa

5.00○○−N0 to 10MPa

10.00

○○−

Q

0 to 20MPa

20.00

○○

−

R0 to 35MPa

35.0

○

○−

S

0 to 50MPa

50.0

○

○−

T0 to 70MPa

70.0−

○−

U

0 to 100MPa

100.0−○−

V0 to 120MPa

120.0−○−⑤Accuracy±0.25％F.S. at 23℃

5±0.5％F.S. at 23℃

7±1.0％F.S. at 23℃
1⑥Power source

24V DC ±10％1⑦Output＊1 Standard comes with "Outlet for electric wire: Lower,
Pressure Connection: Lower."

4⑧
Outlet for electricwire＊2 Conversion joint is included.
＊3 Consult for high corrosion resistant material.

4 to 20mA DC (2 wire system)

Direct connection type, Panel mounting type
1

Standard: SKINTOP R MS-SC13.5

Terminal box typeA

Standard: Cable gland FBA21-13 G1/2⑨
Additional spec.

0

Not required

1

Specify when Diaphragm-Seal type isrequirement (Please consult us).

⑩Treatment0

Not required1

Use no oil

2

Use no water

3

Use no oil & water

Treatment against wetted parts■Use no oil
Oil used in manufacturing the gauges had been
ﬂushed out & no oil residue remained inside its wetted parts.
■Use no water
Water used in manufacturing the gauges had been
ﬂushed out & no water residue remained inside its wetted parts.
■Use no oil & water
Oil/Water used in manufacturing the gauges had been
ﬂushed out & no oil/water residue remained inside its wetted parts.

＊Specify code "X" to refer N/A

8⑮
Documents

0Not required

1

Required(Documents available upon request)

Datasheet (Drawing / Speciﬁcations)
Instruction manual
Calibration test report (One-part one sheet)
Inspection / Traceability certiﬁcate