Honeywell P7645 Series Dry Pressure Sensors Installation Guide

: June 7, 2024
: Honeywell

Table of Contents

INSTALLATION INSTRUCTIONS
INSTALLATION
LED STATUS/INDICATION
TYPICAL APPLICATIONS
TROUBLESHOOTING
RECYCLING
SPECIFICATION
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

P7660/P7645 Series Dry Pressure
Sensors Honeywell P7645 Series Dry Pressure
Sensors

INSTALLATION INSTRUCTIONS

WARNING
This product can expose you to chemicals including 1,3 Butadiene, which is known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov
APPLICATION
The P76660/P7645 Series Dry Differential Pressure Sensors provide reliable, accurate measurement and control. Applications include measurement of extremely low-pressure applications such as building/room pressure, airflow, variable air volume, filter status, and duct pressure. They are ideal for clean rooms, hospitals, fume hoods, and computer rooms.
The P7660 Pressure Sensors have four selectable ranges and 4 output signal configurations. The P7645 offers a single pressure range and a 4-20mA output signal.

Product Application Limitation:
Honeywell products are not designed to be used as the lone device for life or safety applications. Honeywell products are not intended for use in critical applications such as nuclear facilities, human implantable devices,s or life support. Honeywell believes a systems approach to safety is necessary for these types of applications. Honeywell is not liable, in whole or in part, for any claims or damages arising from such uses.
IMPORTANT

Only qualified trade installers should install this product
This product is not intended for life-safety applications
Do not install in hazardous or classified locations
The installer is responsible for all applicable codes
De-energize power supply prior to installation or service
Forming a “drip-loop” (allowing the tubing to dip below the level of the sensor hose barbs) is recommended to protect the sensor from damage caused by condensation.

Honeywell P7645 Series Dry Pressure Sensors - CODE

INSTALLATION

Screw mount sensor directly to duct, or in panel sing self-tapping screws or attach to a DIN rail (2 possible orientations for DIN mounting, BACK, and LEFT SIDE).
Plumb airlines to sensor hose barbs (Accepts 1/8” & 1/4” ID tubing). High (+) and low (-) ports are labeled on the sensor.
Wire sensor for voltage or current output as shown in the wiring diagrams.
Recommendation: Apply power to the sensor. With no pressure applied, press the ZERO SET button for 2seconds. For best results, temporarily connect high and low pressure ports together while zeroing.)

LED STATUS/INDICATION

The LED indicator will flash every 5 seconds for normal operation.
The LED indicator will rapidly flash when the applied pressure is greater than 110% of the selected range.
The LED indicator will rapidly flash momentarily when zeroing process is complete.

TYPICAL APPLICATIONS

Velocity: Use a Pitot tube and plumb high (+) port to total pressure (Pt) connection and low (-) port to static pressure (Ps) connection to directly read Pt-Ps = Pv. Apply correction constant provided by Pitot tube manufacturer.
Duct Static: Install a static pressure pickup tube approximately 2/3 of the way down the discharge air duct and plumb to a high (+) port for positively pressurized ducts.

Honeywell P7645 Series Dry Pressure Sensors - TYPICAL
APPLICATIONS

WIRING P7645

Honeywell P7645 Series Dry Pressure Sensors - WIRING
P7645

WIRING P7660 Honeywell P7645 Series Dry Pressure Sensors - WIRING
P7660

DIMENSIONS Honeywell P7645 Series Dry Pressure Sensors
-DIMENSIONS

TROUBLESHOOTING

Table 1.

Symptom	Solution
No output	Check to wire. Ensure power supply meets requirements.
Pressure reading error	Verify control panel software is configured for

correct output scaling.
Verify switch settings
Verify tubing is not pinched or leaking.
Possible contamination. Ensure the sensor is used only on dry air or nitrogen.

RECYCLING

The product should not be thrown away in the regular trash. Instead, it should be recycled according to the local municipality.
Table 2. Specification by Product

Product number| Pressure
range| Output| LCD
display| Probe
---|---|---|---|---
P7645C0010X| 0-0.10 “W.C.| 4-20 mm loop| No| No
P7645C0025X| 0-0.25 “W.C.| 4-20 mA
Loop| No| No
P7645C0100X| 0-1.0 “W.C.| 4-20 mA
Loop| No| No
P7645CO500X| 0-5.0 “W.C.| 4-20 mA
Loop| No| No
P7660P0500D| 0.1/0.25/2.5/
5.0 “W.C.| Universal| Yes| No
P7660P0500X| 0.1/0.25/2.5/
5.0 “W.C.| Universal| No|
P7660P1000D| 1.0/2.5/5.0/1
0.0 “W.C.| Universal| Yes| No
P7660P1000X| 1.0/2.5/5.0/1
0.0 “W.C.| Universal| No| No

Table 2. Specification by Product

Product number| Pressure
range| Output| LCD
display| Probe
---|---|---|---|---
P7660D0500D| 0.1/0.25/2.5/5.0 “W.C.| Universal| Yes| Yes
P7660D0500X| 0.1/0.25/2.5/ 5.0 “W.C.| Universal| No| Yes
P7660D1000D| 1.0/2.5/5.0/1
0.0 “W.C.| Universal| Yes| Yes
P7660D1000X| 1.0/2.5/5.0/1
0.0 “W.C.| Universal| No| Yes

SPECIFICATION

Power supply: 12-30 VDC/24 VAC, 30 mA max.
Outputs:
P7660: 3-wire 0-5 V/10 V, 4-20 mA loop-powered, 3-wire 4-20 mA (Selectable)
P7645: 4-20 mA loop powered
Output Scaling:
P7660 Selectable Ranges:
0-5” (0.1/0.25/2.5/5.0 “W.C.)
0-10” (1.0/2.5/5.0/10.0 “W.C.)
P7645 Models: 0-0.1” 0.-0.25”, 0-1.0”, 0-5.0”
Operating Temperature:
Operating Range: -4°F to 185°F (-20°C to 85ºC)
Compensated Range: 32°F to 122°F (0°C to 50°F)
Media Compatibility: Dry, oil-free air. Nitrogen.
Sensor Type:
Precision calibrated: MEMS silicone piezoresistive
Accuracy:
Combined linearity and hysteresis: +/- 1.0% of selected range
BFSL: +/- 0.25% BFSL
Auto-zero input: Push-button and contact closure input
Enclosure:
Material: ABS
Dimensions: 4.75”h x 1.82”w x 0.90”d
Optional Probe: P7600PROBE