KEYENCE AP-40A User Manual

A

AP-41

Separate Amplifier Type

M5

M5

M5
(Male)

M5

ø6

ø4

M5

ø6

ø4

M5

Rc(PT)1/8

Pressure Sensor

96M0762

FEATURES

● Separate amplifier-type pressure sensor

Faster response is achieved by reducing the total capacity of piping.

● Two-color, LED digital display

High-intensity, two-color LED ensures high visibility. Four types of
display patterns are selectable.

AP-40A Series

Instruction Manual

"Pa" indication type

PART NAMES AND FUNCTIONS

■ Amplifier

AUTO key

In auto-tuning mode, use
this key to detect pres­sure. In measurement
mode, press this key for 2
seconds or more to adjust
the zero-point.

SET key

Use this key to display or
change preset values.

Output indicator 2

(Green LED)

Screw hole

Use this hole
to bolt the
mounting
bracket with
a hexagonal
socket bolt.

Top side

Front side

Bottom side

Output indicator 1

(Red LED)

UP/DOWN key

Use these keys to
set output modes,
or to change preset
values or units.

Display unit label

Connector port

Insert the sensor
head connector.

Connector cover

● Chattering prevention function

The instantaneous drops in base pressure due to the activation of a
large-bore ejector or other devices can be canceled. This eliminates
the need for preparing a sequence program.

● Automatic sensor head recognition function

When the power is turned on, the amplifier checks the sensor head
connection automatically. A recognized sensor head type appears
green on the display for 0.5 seconds.

● Industry's smallest and lightest sensor head (AP-41M)

This sensor head with half the volume of conventional models
weighs only 4.8 g, enabling flexible mounting.

● High-resolution mode (AP-40RA)

The resolution can be multiplied temporarily by 10 to stabilize
detection of minute differential pressure.

● Zero-shift function (AP-40RA, 40ZA)

The current pressure value can be reset to 0 at any time in order to
prevent measurements from being affected by fluctuations in base
pressure.

Amplifier accessories

• Instruction
manual: 1

• Hexagonal
socket bolt: 2

Reference:

DIN-rail mounting or panel
mounting is also available.
(Optional brackets are
required.)

Sensor head accessories

Spare connector: 1 Mini-wrench: 1

Piping options

OP-33155
Screw pipe joint

•Mounting
bracket A: 1

(for AP-41M only)

OP-35388
PT 1/8
conversion
joint

•Mounting
bracket B: 1

Hexagonal
socket bolts

■ Sensor head

Sensor head
AP-41(M)/43/44/48

Connector

OP-33156
T-shaped quick­release joint (ø4)

OP-42220
T-shaped quick
release joint (M3)

M5

M3

OP-33157
T-shaped
quick-release
joint (ø6)

OP-33158
Reducer

1

Orange
Brown
Blue
Gray

1
2
3
4

CAUTION

MOUNTING

CAUTION

CAUTION

Brown

Black or white

Blue

12 to 24 VDC

0 V

Load

Brown

Black or white

Blue

12 to 24 VDC

4.7 k Ω

0 V

Voltage output

Brown

Black

Blue

12 to 24 VDC

0 V

White

(Control output 1)

(Control output 2)

Load

Load

Pressure sensor main circuit

Over current

protection circuit

Blue

Pink

Pressure sensor

main circuit

12 to 24 VDC

3.3 k Ω

11 kΩ

Blue

Pink

Analog
output (+)

0 V

Protection
circuit

Pressure sensor

main circuit

CAUTION

■ AP-40A/40RA/40ZA

As shown in the figure with "Amplifier accessories" on page 1, attach
the mounting bracket to the amplifier with hexagonal socket bolts.
The mounting bracket can be attached laterally according to the
location.

To avoid breakage, limit the tightening torque
for the hexagonal socket bolt to 0.3 N•m.

■ AP-41(M)/43/44

Limit the tightening torque for the screw hole of
the sensor head to 0.3 N•m.

■ AP-48

• Limit the tightening torque on the screw to 5 N•m.

• The AP-48 is only compatible with the AP-40RA.

• If one of the pressure ports is to be left open, ensure that foreign
objects can not enter the port.

• To avoid deformation or damage during mounting, do not apply
force to the sensor body.

■ Zero-point adjustment

At normal atmospheric pressure (1 atm.), press A for at least 2
seconds in measurement mode. The display changes to “----”, then to
“0”. The zero adjustment function can be used when the pressure is
within ±5% of F.S.

BASIC OPERATION

Basic operation (See also "ADJUSTMENT" on page 4.)
<Example>

● Checking the suction condition

1. Select F-3 (2-independent mode) and return to the measurement
mode.

➮ Refer to the setting in "Operation Mode" on the left-hand side of page 4.

2. Enter the target pressure value (A) and return to the measurement
mode. (You can specify another target pressure value (b).)

➮ Refer to the setting in "Preset Value Input Mode" on the right-hand side of

page 4.

3. Start detection.

● Base pressure control

1. Select F-4 (Window mode) and return to the measurement mode.

➮ Refer to the setting in "Operation Mode" on the left-hand side of page 4.

2. Enter the upper (H) and lower (L) limit values of the allowable
pressure and return to the measurement mode.

➮ Refer to the setting in "Preset Value Input Mode" on the right-hand side of

page 4.

3. Start detection.

ATTACHING A SPARE CONNECTOR

Use the spare connector to change the length of the sensor head
cable. Cables as long as 10 m can be used.

1. If the connector cover is fitted into the connector body, open the
cover.

Connector body

Slotted screwdriver

2. Lift the end of the cover.

CONNECTIONS AND INPUT/OUTPUT CIRCUIT

■ Connections

• Drive current load

• Input to voltage input equipment

■ Input/output circuit

• Output circuit

AP-40RA/40ZA (RA/ZA type only)

• Input circuit (Zero-shift input)

Zero-shift input resets the display
to “0” at the rising edge of the
signal.

AP-40A (40A type only)

• Analog output circuit

Connector cover

1. Widen the gap.

2. Cut a cable to the appropriate length and strip off the sheath for
approximately 25 mm from the end.

Approx.
25 mm

Approx.
25 mm

Note: It is not necessary
to remove the sheath of
the core wire.

3. Insert the cables into the proper holes as deep as possible. Then,
press the connector cover into the body with pliers.

Reference:

Note 1: Do not allow the cable to protrude from the other end of the

connector cover.
Note 2: Ensure that the cables are inserted as far as they will go. If
the inserted length is insufficient, the press-fitting fails.

SAFETY PRECAUTIONS

Be sure to follow the instructions below to avoid malfunctions.

■ Connection

• When using a commercially available switching regulator, be sure
to ground the frame ground terminals.

• Isolate the sensor’s wiring from power lines or high-voltage lines;
otherwise, the sensor may malfunction due to noise interference.

• The amplifier becomes hot or breaks down due to improper wiring.

• The press-fitting is available only once for each sensor head
connector.

■ Notice about CE marking

• Attach the ferrite core (OP-87505) if you extend a sensor head
cable/ amplifier power cable to 3 m or more to use.
(Attachment position: within 100 mm from the amplifier unit of a
power cable, Number of turns: 2)

■ Other

• Do not use the AP-40A Series for the detection of corrosive gases
or liquid.

• Do not insert any objects, such as wires, from the pressure port.
The pressure-sensing element may break, resulting in malfunc­tions.

• Do not press the front panel keys with a pointed object.

• The AP-40A Series does not have an explosion-proof structure.
Do not use it for the detection of flammable gases.

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