Honeywell P7640U Installation Instructions Manual

INSTALLATION INSTRUCTIONS

62-0282-02

P7640U Differential Pressure Sensors

APPLICATION

The P7640U Universal Differential Pressure Sensors
provide reliable, accurate measurement and control.
Proper applications include measurement of extremely
low pressure applications such as: building/room
pressure, air flow, variable air volume, filter status, and
duct pressure. They are ideal for clean rooms, hospitals,
fume hoods, and computer rooms.

The P7640 Pressure Sensors are designed with field­selectable 4-20 mA, 0-5 Vdc, or 0-10 Vdc output. The
pressure ranges fall between 0–10 in. w.c./0–2500 Pa.
See Table 2.

Accessory

32003169-001 Duct Pressure Pick-up Probe, 4 in.

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard­ous condition.

2. Check ratings given in instructions and on the
product to ensure the product is suitable for your
application.

3. Installer must be a trained, experienced service
technician.

4. After installation is complete, check out product
operation as provided in these instructions.

IMPORTANT

All wiring must agree with applicable codes,
ordinances and regulations.

Mounting

Screw holes are accessed inside the enclosure (with the
cover removed) and are located in the upper left and
lower right corners.

Panel Mount

Run tubing from one (static) or both (differential) barb
fittings, making sure the typically higher pressure source
is connected to the port labeled HI, and the typically
lower pressure source is connected to the port labeled
LO.

Configure the internal tubing as shown in Fig. 1. Use
small diameter tubing for panel mount configuration.

Duct Mount

1. Thread probe into the back of the housing.

2. Configure internal tubing as shown in Fig. 2. Use

large diameter tubing for duct mounting
configuration.

3. Unit is typically mounted at the high pressure loca­tion when used for differential control.

CONFIGURATION

Select the proper output, mode, and pressure range
using the switches and jumpers:

1. Select output using the output switch:
a. Current: mA (then skip to step 3), or
b. Voltage: Volt.

2. Select 0-10 Vdc or 0-5 Vdc using jumper J4.

3. Select bi- or uni-directional mode using jumper J5.

NOTE: Setting for 0 to 10 in. w.c. and bi-direc-

tional will give output from -10 to 10 in.
w.c.

4. Select inches w.c. or Pascal scale using jumper J7.

5. Select fast or standard response time using jumper

J8.

6. Select appropriate full-scale pressure range using
the rotary switch. Align arrow (not the slot) to the
desired range. See Table 2 for the range selection
guide.

NOTE: The universal model is marked full scale.

When the range is changed, the LCD
models momentarily indicate selected
range.

7. Set output according to Table 1.

P7640U DIFFERENTIAL PRESSURE SENSORS

62-0282—02 2

Table 1. Controller Compatibility

and Output Settings.

Fig. 1. Tubing for panel mount.

Fig. 2. Tubing for duct mount

WIRING (FIG. 3 THROUGH 5)

CAUTION

Equipment Damage Hazard.
Can damage the device beyond repair.

Disconnect power supply before installation.

NOTE: Wiring to the ZERO terminals is optional.

Fig. 3. Wiring for voltage (Vdc) output.

CAUTION

Equipment Damage Hazard.
Can damage the device beyond repair.

Do not apply power to output terminal. Permanent
equipment damage will result.

Fig. 4. Wiring for current (mA) output.

Controller

Required Sensor

Output Setting

L

ONSPEC™

Setting

W7750, W7760, W7761 4-20 mA FilterPress or

P7610B

W7750B, W7760C,
W7753, W7760

0-10 Vdc (default) FilterPress or

P7610F, or voltage

Non-Honeywell 0-5 Vdc n/a

SMALLER DIAMETER TUBE
FOR PANEL CONFIGURATION

M27485

USE THE
FRONT BARB

LARGER DIAMETER TUBE
FOR DUCT CONFIGURATION

M27484

USE THE
FRONT BARB

L1

L2

CONTROLLER,
METER OR
RECORDER

INPUT SIGNAL

COMMON

+

+

–

–

+

–

1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

2

POLARIZED SECONDARY INDICATIONS FOR USE WITH DC POWER
SUPPLY ONLY.

3

DRY CONTACT TO AUTOMATICALLY ZERO THE SENSOR UPON
CLOSURE. (OPTIONAL)

3

2

1

ZERO

PWR OUT COM ZERO

RESPONSE

FAST/STD

mA

VOLT

OUTPUT

JP8

UNITS

IN. W.C./PA

JP7

MODE
BI/UNI

JP5

VOLT

SV/10V

JP4

7

1

2

3

4

5

6

M27291

12 TO 30 Vdc
POWER SUPPLY

CONTROLLER,
METER OR
RECORDER

INPUT SIGNAL

COMMON

+

+

–

–

M27292

ZERO

PWR OUT COM ZERO

RESPONSE

FAST/STD

mA

VOLT

1

DRY CONTACT TO AUTOMATICALLY ZERO THE SENSOR
UPON CLOSURE. (OPTIONAL)

1

OUTPUT

JP8

UNITS

IN. W.C./PA

JP7

MODE
BI/UNI

JP5

VOLT

SV/10V

JP4

7

1

2

3

4

5

6

P7640U DIFFERENTIAL PRESSURE SENSORS

3 62-0282—02

Fig. 5. Typical wiring for three-wire pressure sensor with Vdc output (used with the XL15A Controller).

OPERATION

IMPORTANT

During the first few minutes of operation, read­ings at zero pressure and lowest pressure
ranges appear erroneous. Following this initial
warm-up period, the P7640 maintains specified
accuracy and stability.

The display momentarily indicates “SET” when a selection
is made. In normal operation, pressure indications are in.
w.c.

Zeroing

IMPORTANT

Perform zeroing only when both Zero ports are
exposed to the same pressure.

Zeroing the device automatically resets the output and
displays zero pressure. To do this either:
— Press and hold the ZERO pushbutton for 2 seconds, or
— Provide contact closure on the ZERO terminals. To

ensure this, place a piece of jumper tubing between HI
and LO.

NOTE: To avoid accidental zero, this feature is enabled

only while detected pressure is within 5% of
factory calibration.

E

GND

OUT1OUT2OUT3OUT4OUT5OUT6OUT7OUT8DI1DI2DI3DI4GND GND

24

VAC

COM

24

VAC

COM

24

VAC24VAC24VAC24VAC24VAC

OUT
COM

21
VDC
OUT

GND E-BUS E-BUS

AI1AI

2

AI3AI

4

AI5AI

6

AI7AI

8

ANALOG

OUT

AO1AO

2

17 18 19 20 21 22 23 24 25 26 27 28 29

L1

(HOT)

L2

31 32 33 34 35 36 37 38 39 40 41 42 43

44

12345 678 9101112 14 1615

13

W7760A

AI

GND

AI

GND

AI

GND

AI

GND

AO

GND

+
–

O

P7640

+
–

O

P7640

+
–

O

H76XX

+
–

M18302B

Vin (Vac)

Gnd

Vo (0-10 Vdc)

PWR

COM

OUT

PWR

COM

OUT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE.

1

1

2

2

Table 2. Range Selection Guide.

Rotary Switch

Position 0–10 in. w.c. 0–2500 Pascal

00.125

10.2550

20.5100

31250

42.5500

5 5 1000

6102500

7102500

P7640U DIFFERENTIAL PRESSURE SENSORS

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9

customer.honeywell.com

® U.S. Registered Trademark
© 2008 Honeywell International Inc.
62-0282—02 M.S. Rev. 06-08

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