HK Instruments DPI Series Manuale utente

INSTALLATION

INSTRUCTIONS

DIFFERENTIAL PRESSURE SWITCHES

DPI Series

WARNING

• READ THESE INSTRUCTIONS CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS

DEVICE.

• Failure to observe safety information and comply with

instructions can result in PERSONAL INJURY, DEATH AND/OR

PROPERTY DAMAGE.

• To avoid electrical shock or damage to equipment, disconnect

power before installing or servicing and use only wiring with

insulation rated for full device operating voltage.

• To avoid potential ﬁre and/or explosion do not use in potentially

ﬂammable or explosive atmospheres.

• Retain these instructions for future reference.

• This product, when installed, will be part of an engineered

system whose speciﬁcations and performance characteristics

are not designed or controlled by HK Instruments. Review

applications and national and local codes to assure that the

installation will be functional and safe. Use only experienced

and knowledgeable technicians to install this device.

SPECIFICATIONS

INTRODUCTION

Thank you for choosing an HK Instruments DPI series electronic

differential pressure switch. The DPI series is intended for use

in commercial environments. It combines the advantages of an

electronic differential pressure switch (on-off relay) and a multi-

functional differential pressure transmitter to meet your job re-

quirements.

The DPI series is comprised of the DPI±500 with bi-directional

measurement ranges from ±100 to ±500 Pa and the DPI2500 with

measurement ranges from 100 to 2500 Pa.

All DPI series devices include one relay, display, manual pushbut-

ton zero point calibration and span point calibration. Optional fea-

tures include a second relay and autozero calibration.

APPLICATIONS

DPI series devices are commonly used in HVAC/R systems for:

• fan, blower and ﬁlter monitoring

• staircase pressure monitoring and alarm

• pressure monitoring in cleanrooms

• boiler pressure monitoring and alarm

SPECIFICATIONS

Performance

Accuracy:

±0.7 % (±1.5 % initial)

%/FS from highest pressure range including:

general accuracy, temperature drift, linearity, hysteresis,

and repetition error.

Long term stability:

Typical 1 year

With autozero: ±1 Pa

Without autozero: ±8 Pa

Overpressure:

Proof pressure: 25 kPa

Burst pressure: 30 kPa

Zero point calibration:

Automatic with autozero (-AZ) circuit or

Manual via menu

Response time:

0.5–10 s, selectable via menu

Technical Speciﬁcations

Media compatibility:

Dry air or non-aggressive gases

Measuring units:

Pa, kPa, mmWC, inWC, mbar selectable via menu

Measuring element:

Piezoresistive

Environment:

Operating Temperature:

Without autozero : -10...50 °C

With autozero: -5...50 °C

Storage temperature: -20...70 °C

Humidity: 0 to 95 % rH, non condensing

Physical

Dimensions:

Case: 89 x 86.5 x 37.1 mm

Weight:

150 g

Mounting:

Case: 2 each 4.3 mm holes

Lid: 2 each 4.3 mm holes

Materials:

Case: ABS

Lid: PC

Duct connectors: ABS

Tubing: PVC

Protection standard:

IP54

Touch sensitive buttons on the lid:

Menu, Back, OK, down arrow, up arrow

Display:

3 1/2 digit LCD backlit display

Size: 46.0 W x 14.5 H mm

Electrical connections:

n/out:

Terminal block (24 V, GND, 0–10 V)

Wire: 12–24 AWG (0.2–1.5 mm2)

Relay 1:

Terminal block (NC, COM, NO)

Wire: 12–24 AWG (0.2–1.5 mm2)

Relay 2:

Terminal block (NC, COM, NO)

Wire: 12–24 AWG (0.2–1.5 mm2)

Cable entries:

Strain relief: M16 & M20

Knockout : 16 mm

Knockout : 20 mm

Pressure ﬁttings:

5.2 mm barbed brass

+ High pressure

− Low pressure

Electrical

Circuit: 3-wire (24 V, GND, 0–10 V)

Input:

Without autozero: 21–35 VDC/ 24 VAC, ±10 %

With autozero: 24 VAC or VDC, ±10 %

Output:

Analog: 0–10 V

Relay 1: 250 VAC / 30 VDC / 6 A

Relay 2: 250 VAC / 30 VDC / 6 A

Resistance minimum: 1 kΩ

Current consumption:

35 mA + relays (7 mA each) + AZ circuit (20 mA)

+ 0–10 V output (10 mA)

Conformance

Meets requirements for CE marking:

EMC Directive 2004/108/EC

RoHS Directive 2002/95/EC

LVD Directive: 2006/95/EC

SCHEMATICS

DIMENSIONAL DRAWINGS

INSTALLATION

Figure 1a - Surface mounting

STEP 1: MOUNTING THE DEVICE

1) Mount the device in the desired location (see step 1).

2) Open the lid and route the cable(s) through the strain relief(s) and

connect the wires to the terminal block(s) (see step 2).

3) The device is now ready for conﬁguration.

WARNING! Apply power only after the device is properly wired.

1) Select the mounting location (duct, wall, panel).

2) Use the device as a template and mark the screw holes.

3) Mount with appropriate screws.

Figure 1b - Mounting orientation

Figure 1c - Application connections

24 V GND 0–10 V

Terminal block Terminal block for relays

NC COM NO NC COM NO

37.1

89.0

86.5

74.5

64.5

52.5

4.2

YES NO NO

Static pressure Filter/Damper

monitoring

Fan/Blower

monitoring

Not

connected

STEP 2: WIRING DIAGRAMS CONFIGURATION CONTINUED

For CE compliance, a properly grounded shielding cable is required.

1) Unscrew the strain relief and route the cable(s). Use separate

strain relief for the 0–10 V output cable and the relay cable(s).

2) Connect the wires as shown in ﬁgure 2a and 2b.

3) Tighten the strain relief.

Figure 2a - Wiring diagram 0–10 V output

Figure 2b - Wiring diagram relay(s)

STEP 3: CONFIGURATION

1) Select the desired measurement unit.

2) Select the desired measurement range.

3) Select the desired response time.

4) Conﬁgure the relay(s).

5) Zero the device.

6) Calibrate the span point.

7) Connect the pressure tubes. Connect positive pressure to port

labeled "+" and negative pressure to port "-".

The device is now ready to be used.

24 V

GND

Pout

Power supply

24 VDC / 24 VAC

Output 0...10 V





/







Pa, kPa, mmH2O, inchWC, mbar

Pressure range selection

Response time

Relay menu(s)

Zero point calibration

Response time

High point calibration menu





High point calibration

Reset high point calibration







Relay activation menu

Relay setpoint

Relay hysteresis 0–5 % of range





Relay activation on increasing pressure

Relay activation on decreasing pressure

COM

Relay 1

COM

Relay 2

With the MENU button you can enter the menu by pressing the button for

3 seconds. You can exit the menu without making any

changes.

With the BACK button you can return without making changes.

With the OK button you can open new options or conrm changes and return

to previous display.

With the buttons you can scroll the menus.

STEP 4: ZEROING THE DEVICE

To zero the device two options are available:

1) Manual Pushbutton zero point calibration

2) Autozero calibration

Does my transmitter have an autozero calibration? See the product

label. If it shows -AZ in the model number, then you have the au-

tozero calibration.

1) Manual Pushbutton zero point calibration

NOTE: Supply voltage must be connected at least one hour prior to

zero point adjustment.

a) Disconnect both pressure tubes from the pressure ports labeled

+ and –.

b) Push both arrow buttons on top of the lid shortly or go to

conﬁguration menu and select “Zero”.

c) The zeroing of the device will proceed automatically when the

green led on top of the lid turns off and “Zero” text followed by

a counter from 3 to 0 seconds appears on the display. The

zeroing is complete when the green led turns on again.

d) Reinstall the pressure tubes ensuring that the High pressure

tube is connected to the port labeled +, and the Low pressure

tube is connected to the port labeled −.

NOTE: The zero point should be calibrated via manual autozero, one

hour after installation and at least every 12 months during normal

operations.

2) Autozero calibration

If the device includes the optional autozero circuit, no action is re-

quired.

Autozero calibration (-AZ) is an autozero function in the form of an au-

tomatic zeroing circuit built into the PCB board. The autozero calibra-

tion electronically adjusts the transmitter zero at predetermined time

intervals (every 10 minutes). The function eliminates all output signal

drift due to thermal, electronic or mechanical effects, as well as the

need for technicians to remove high and low pressure tubes when

performing initial or periodic transmitter zero point calibration. The au-

tozero adjustment takes 4 seconds after which the device returns to

its normal measuring mode. During the 4 second adjustment period,

the output and display values will freeze to the latest measured value.

Transmitters equipped with the autozero calibration are virtually

maintenance free.

WARRANTY POLICY

The seller is obligated to provide a warranty of 24 months for the de-

livered goods regarding material and manufacturing. The warranty

period is considered to start on the delivery date of the product. If

a defect in raw materials or a production ﬂaw is found, the seller is

obligated, when the product is sent to the seller without delay or be-

fore expiration of the warranty, to amend the mistake at his/her dis-

cretion either by repairing the defective product or by delivering free

of charge to the buyer a new ﬂawless product and sending it to the

buyer. Delivery costs for the repair under warranty will be paid by the

buyer and the return costs by the seller. The warranty does not com-

prise damages caused by accident, lightning, ﬂood or other natural

phenomenon, normal wear and tear, improper or careless handling,

abnormal use, overloading, improper storage, incorrect care or re-

construction, or changes and installation work not done by the seller

or his/her authorized representative. The selection of materials for de-

vices prone to corrosion is the buyer’s responsibility, unless otherwise

is legally agreed upon. Should the manufacturer alter the structure of

the device, the seller is not obligated to make comparable changes to

devices already purchased. Appealing for warranty requires that the

buyer has correctly fulﬁlled his/her duties arisen from the delivery and

stated in the contract. The seller will give a new warranty for goods

that have been replaced or repaired within the warranty, however only

to the expiration of the original product’s warranty time. The warranty

includes the repair of a defective part or device, or if needed, a new

part or device, but not installation or exchange costs. Under no cir-

cumstance is the seller liable for damages compensation for indirect

damage.

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