HK Instruments DPT-Flow-4 Series User manual

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
INSTALLATION
INSTRUCTIONS
AIR FLOW AND VELOCITY TRANSMITTERS
DPT-FLOW SERIES-4
• 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.
Thank you for choosing an HK Instruments DPT-Flow Series-4 air
flow transmitter. The DPT-Flow Series-4 is intended for use in com-
mercial environments. The DPT-Flow measures air flow, velocity
and differential pressure. It is designed to be used in combination
with air flow measurement probes (i.e. FloXact) or with centrifugal
fans that provide differential pressure connections and K-values.
The DPT-Flow Series-4 air flow transmitter is comprised of the
DPT-Flow-4, DPT-Flow-8, DPT-Flow-20 and DPT-Flow-30 with
measurement ranges of 0–4 inWC, 0–8 inWC, 0–20 inWC and
0–30 inWC, respectively. All models come with display and manu-
al push-button auto-zero. The DPT-Flow is available with optional
and NIST standard calibration certificates.
SPECIFICATIONS
Performance
Accuracy (at applied pressure):
Ranges < 0.5 inWC = ±0.01 inWC
Ranges 0.5 inWC = ±1.5 % inWC
(Accuracy specifications include: general accuracy,
temperature drift, linearity, hysteresis, long term
stability, and repetition error).
Thermal effects:
Temperature compensated across the full spectrum of
capability.
Overpressure:
Proof Pressure: 100 inWC
Zero point calibration:
Automatic with function or
manual pushbutton autozero
Response time:
1.0−20 sec, selectable via menu
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Pressure units (select via configuration menu):
Pa, kPa, mbar, inWC, mmWC
Pressure output range (select via configuration menu)
Flow units (select via configuration menu):
Volume: m3/s, m3/hr, cfm, l/s
Velocity: m/s, fpm
Flow output range (select via configuration menu):
Measuring element:
MEMS
Environment:
Operating temperature:
14−122 °F (-10−50 °C)
with (-eZ) circuit option
23−122 °F (-5−50 °C)
Configuration, while using display
32−122 °F (0−50 °C)
Storage temperature:
-4−158 °F (-20−70 °C)
Humidity:
0 to 95 % rH, non condensing
Physical
Case:
Dimensions: 3.54” x 3.74” x 1.4”
(90.0 x 95.0 x 36.0 mm)
Weight: 5.3 oz (150 g)
Mounting:
2 each 11/64” (4.3 mm) screw holes, one slotted
Materials:
Case: ABS (UL 94 V-0 Approved)
Lid: PC (UL 94 V-1 Approved)
Protection standard: IP54 / NEMA3
Display (required for configuration):
2-line display (12 characters/line)
Size: 1.81” W x 0.57” H
(46.0 x 14.5 mm)
Electrical connections:
4-screw terminal block
Wire: 12–24 AWG (0.2–1.5 mm2)
Cable entry:
Strain relief: M16
Knockout ø: 0.625” (16 mm)
Pressure fittings:
3/16” ø (5.2 mm) barbed brass
+ High pressure
− Low pressure
Electrical
Voltage:
Circuit: 3-wire ([V Out or P out], 24 V, GND)
Input: 24 VAC or VDC, ±10 %
Output: 0–10 V, selectable via jumper
Power consumption: <1.0 W
Resistance minimum: 1 kΩ
Current:
Circuit: 3-wire ([V out or P out] Out, 24 V, GND)
Input: 24 VAC or VDC, ±10 %
Output: 4–20 mA, selectable via jumper
Power consumption: <1.2 W
Maximum load: 500 Ω
Conformance
Meets requirements for CE marking:
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU
Meets safety requirements for electrical equipment for
measurement, control, and laboratory use:
ETL marking, standard IEC61010-1.
Product is tested and meets the NRTL product
approval requirements.
INTRODUCTION WARNING
AVERTISSEMENT
• LISEZ ATTENTIVEMENT CES INSTRUCTIONS AVANT DE PROCÉDER À
L’INSTALLATION, LA MISE EN SERVICE OU L’ENTRETIEN DE CET APPAREIL.
• Le non-respect des informations et instructions de sécurité peut entraîner DES
DOMMAGES CORPORELS, LA MORT ET/OU DES DÉGÂTS MATÉRIELS.
• Afin d’éviter les chocs électriques et les dommages matériels, déconnectez
l’alimentation électrique avant l’installation ou l’entretien, et utilisez uniquement du
câblage avec isolement assigné pour une tension d’alimentation optimale.
• Afin de prévenir les risques d’incendie et/ou d’explosion, n’utilisez pas l’appareil
dans des environnements potentiellement inflammables ou explosifs.
• Conservez ces instructions à titre de référence.
• Une fois installé, ce produit fera partie d’un système technique dont les
spécifications et les caractéristiques de performance ne sont ni conçues ni
contrôlées par HK Instruments. Consultez les applications et les codes nationaux
et locaux pour garantir le fonctionnement correct et sûr de l’installation. Ne faites
appel qu’à des techniciens expérimentés et compétents pour installer cet appareil.
APPLICATIONS
DPT-Flow Series-4 devices are commonly used in HVAC/R sys-
tems for:
• air flow and pressure monitoring across centrifugal fans and
blowers
• in-duct air flow and pressure monitoring
• VAV applications
Units Range
m3/s 0.025-50
m3/hr 100-200,000
cfm 50-100,000
DPT-Flow-4 DPT-Flow-8 DPT-Flow-20 DPT-Flow-30
Pa 100-1,000 200-2,000 500-5,000 700-7,000
kPa 0.1-1.0 0.2-2.0 0.5-5.0 0.7-7.0
mbar 1-10 2.0-20 5.0-50 7. 0 -7 0
mmWC 10-100 20-200 50-500 70-700
inWC 0.4-4.0 0.8-8.0 2.0-20 2.5-30
Units Range
l/s 25-50,000
m/s 1-10 0
ft/min 2,000-20,000
RoHS 2
2011/65/EU
4002576
Conforms to ANSI/UL Std 61010
Certified to CAN/CSA Std C22.2 No 61010
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
SCHEMATICS
DIMENSIONAL DRAWINGS
Figure 1a - Surface mounting
Figure 1b - Mounting orientation
Terminal Block
Pressure
Sensor
LED
Joystick 1
Zero
V OUT
P OUT
24V
GND
4-20mA
Out
0-10V
Menu Buttons
Joystick 2
Flow
Joystick 3
Select
Up
Down
Pressure
Output
Jumpers
3.54 (90.0)
3.03 (77.0)
2.815 (71.5)
2.086 (53.0)
0.169
4.3
3.74 (95.0)
DPT-Flow
1.41 (36.0)
inch (mm)
YES NO NO
INSTALLATION
1) Mount the device in the desired location (see step 1).
2) Open the lid and route the cable through the strain relief 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.
STEP 1: MOUNTING THE DEVICE
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 (not included).
MOUNTING THE DEVICE CONTINUED
STEP 2: WIRING DIAGRAMS
For CE compliance, a properly grounded shielding cable is required.
1) Unscrew the strain relief and route the cable(s).
2) Connect the wires as shown in figure 2.
3) Tighten the strain relief.
Figure 2 - Wiring diagram
V Out
P Out
24V
GND
+Power Supply
24VDC / 24VAC
V A VA
Output 0 - 10V / 4 - 20mA
Output 0 - 10V / 4 - 0mA
The pressure tubes are connected to a flow measurement probe (i.e. FloXact), or to the
measurement ports specified by the fan manufacturer. Please see the FloXact installation
guide or the fan manufacturer’s technical specifications for more information.
Figure 1c - Application connections
To configure the output signals (0–10 V or 4–20 mA) for pressure
and flow (velocity or volume), install jumpers on the 3-pin set of
output jumpers for fow and pressure, located on the right side of
the open device (see schematics). Configuration options for the
jumpers are shown in figure 4. (Gray with white dots show that a
jumper is installed.)
STEP 3: OUTPUT SIGNAL CONFIGURATION

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
OUTPUT SIGNAL CONFIGURATION CONTINUED STEP 4: CONFIGURATION MENU
Figure 3 - Jumpers
Terminal Block
Pressure
Sensor
LED
Joystick 1
Zero
V OUT
P OUT
24V
GND
4-20mA
Out
0-10V
Menu Buttons
Joystick 2
Flow
Joystick 3
Select
Up
Down
Pressure
Output
Jumpers
Flow
Pressure
4–20 mA
Out
0–10 V
Jumper
stored
Gray block indicates how the jumper is installed.
Figure 4 - Output signal 0–10 V or 4–20 mA
jumper positions
4–20 mA
Out
0–10 V
Flow Pressure
Flow Pressure
Flow Pressure
Flow Pressure
Jumpers
Jumpers
Jumpers
Jumpers
Gray colour indicates
that a jumper is
installed
Flow out: 0–10 V
Pressure out: 4–20 mA
Flow out: 0–10 V
Pressure out: 0–10 V
Flow out: 4–20 mA
Pressure out: 4–20 mA
Flow out: 4–20 mA
Pressure out: 0–10 V
4–20 mA
Out
0–10 V
4–20 mA
Out
0–10 V
4–20 mA
Out
0–10 V
Selection convention used to input information into DPT-Flow
Entering information into the DPT-Flow is accomplished with three
(3) joysticks (see schematics). The joysticks are labeled as follows:
Joystick 1 – SELECT
Tilting Joystick 1 serves two functions:
A. Highlight submenus: when a submenu is available, tilting
joystick 1 will activate the submenu, causing it to blink.
B. Confirm selection: when the proper choice is shown on the
screen, tilting joystick 1 will select and store that value.
Joystick 2 – UP
Cycle up: Tilting joystick 2 will cycle up through the menu or
submenu choices. If you cycle past your desired choice, the
menu cycles through all the choices and return to the beginning
of the list.
Joystick 3 – DOWN
Cycle down: Tilting joystick 3 will cycle down through the menu
or submenu choices. If you cycle past your desired choice, the
menu cycles through all the choices and returns to the beginning
of the list.
STEP 4-0: ENTER THE CONFIGURATION MENU
Tilt joystick 1 (see schematics for the location of the joysticks 1, 2
and 3) for 2-5 seconds to enter the configuration menu.
STEP 4-1: SELECT MODE
Determine if the configuration is for:
Fan manufacturer where you will connect
tubing directly to the ports on the fan.
-or-
Probe where you will connect tubing to a probe.
1) Highlight submenu by tilting joystick 1. Fan
Mfg will begin blinking.
2) Cycle up or cycle down by using joystick 2 or
joystick 3, between the submenu choices.
3) Confirm selection by tilting joystick 1 when the
correct choice is shown on the display.
SELECT MODE
Fan Mfg
Display
Select mode
Fan Mfg
Probe
Menu
If Fan Mfg is selected:
Cycle down by using joystick 3 to cycle to the next step in
configuring the device. For the next configuration step in these
installation instructions, go to step 4-16.
If Probe is selected:
Cycle down by using joystick 3 to cycle to the next step in
configuring the device. For the next configuration step in these
installation instructions, go to step 4-2.

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
Continuing from the selection of Rectangle (inch)
or Rectangle (mm).
1) Highlight submenu, the top line of the display
will show WIDTH and the bottom line will change to a blinking
number.
2) Cycle up or down by tilting joystick 2 or 3 respectively, to increase
or decrease the value shown on the display.
3) The digit farthest to the right will cycle from 0–9 or 9–0, then
move to the next digit on the left and continue cycling up or
down. If the desired number is passed, then tilt the opposite
joystick to cycle back within 1.25 seconds, after which the display
will begin to blink indicating that the steps 2 and 3 must be
repeated.
4) If the diameter has a fraction of an inch (i.e. 10-3/8” = 10.365),
then enter the fraction as a decimal equivalent.
5) Once the display shows the desired settigs and begins blinking
again, confirm your selection by tilting joystick 1.
6) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-6.
Determine if the probe installed is:
FloXact probe from HK Instruments.
-or-
Other probe made by a different manufacturer.
1) Highlight submenu by tilting joystick 1, Probe
will begin blinking.
2) Cycle up or cycle down by tilting joystick 2 or
joystick 3, between the submenu choices.
3) Confirm selection by tilting joystick 1 when the
correct choice is shown on the display.
Display
Select probe
FloXact
Other
Menu
STEP 4-2: SELECT PROBE
If FloXact is selected:
Cycle down by tilting joystick 3 to the next step in configuring
the device. For the next configuration step in these installation
instructions, go to step 4-3.
If Other is selected:
Cycle down by tilting joystick 3 to the next step in configuring
the device. For the next configuration step in these installation
instructions, go to step 4-17.
Continuing from the selection of probe: FloXact.
1) Highlight submenu, the display will show SEL:
DUCT and Round (inch) will be blinking.
2) Cycle up or cycle down by tilting joystick 2 or
joystick 3, between the submenu choices.
3) Confirm selection by tilting joystick 1 when the
correct choice is shown on the display.
4) Cycle down to the next step in configuring
the device. For the next configuration step in
these installation instructions:
If Round is selected, go to step 4-4.
If Rectangle is selected, go to step 4-5.
Display
Select duct
Round - inch
Round - mm
Rectangle - inch
Rectangle - mm
Menu
STEP 4-3: SELECT DUCT
STEP 4-4: DUCT DIAMETER
SEL:PROBE
Probe
SEL:DUCT
Round(inch)
Continuing from the selection of Round (inch) or
Round (mm).
1) Highlight submenu, the top line of the display
will show DIAMETER and the bottom line will
change to a blinking number.
2) Cycle up or down by tilting joystick 2 or 3
respectively, to increase or decrease the value
shown on the display.
Display
DIAMETER
10.000
Display
WIDTH
10.000
STEP 4-5: DUCT WIDTH
Continuing from the selection of the duct width.
1) Highlight submenu, the top line of the display
will show HEIGHT and the bottom line will
change to a blinking number.
Display
HEIGHT
10.000
2) Cycle up or down by tilting joystick 2 or 3 respectively, to increase
or decrease the value shown on the display.
3) The digit farthest to the right will cycle from 0–9 or 9–0, then
move to the next digit on the left and continue cycling up or
down. If the desired number is passed, then tilt the opposite
joystick to cycle back within 1.25 seconds, after which the display
will begin to blink indicating that the steps 2 and 3 must be
repeated.
4) If the diameter has a fraction of an inch (i.e. 10-3/8” = 10.365),
then enter the fraction as a decimal equivament.
5) Once the display shows the desired settigs and begins blinking
again, confirm your selection by tilting joystick 1.
6) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-7.
STEP 4-6: DUCT HEIGHT
STEP 4-4: DUCT DIAMETER CONTINUED
3) The digit farthest to the right will cycle from 0–9 or 9–0, then
move to the next digit on the left and continue cycling up or down.
If the desired number is passed, then tilt the opposite joystick to
cycle back within 1.25 seconds, after which the display will begin
to blink indicating that the steps2 and 3 must be repeated.
4) If the diameter has a fraction of an inch (i.e. 10-3/8” = 10.365),
then enter the fraction as a decimal equivalent.
5) Once the display shows the desired setting and begins to blink
again, confirm your selection by tilting joystick 1.
6) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to step
4-8.

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
Continuing from the step 4-4, 4-7, or 4-19.
The gain feature is designed to allow modification
to the reported output, to match test and balance
measurements, if necessary. The number shown
is a multiplier. Increase the reported output by
increasing the gain number above 1.000. To
increase reported output by 5 %, adjust number
to 1.050. Decrease the reported output by
decreasing the gain number to less than 1.000.
To decrease the reported output by 5 %, adjust
number to 0.950.
Display
GAIN
1.000
1) Highlight submenu, the display will show GAIN and the number
1.000 will be blinking.
2) Cycle up or cycle down to increase or decrease the value of the
multiplier.
3) Confirm selection when the correct value is shown on the display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-9.
STEP 4-8: GAIN
Continuing from the selection of gain multiplier.
1) Highlight submenu, the display will show
PRESS. UNIT and “WC will be blinking.
2) Cycle up or cycle down to select the correct
measurement unit.
3) Confirm selection by tilting joystick 1 when the
correct option is shown on the display.
4) Cycle down to the next step in configuring
the device. For the next configuration step in
these installation instructions, go to step 4-10.
Display
Pressure unit
output options
Pa
kPa
mbar
psi
inWC
mmWC
None
Menu
STEP 4-9: PRESSURE UNIT
PRESS.UNIT
“WC
Continuing from the selection of the pressure
unit.
This device supports pressure output maximum
settings to improve resolution of the pressure
reading by limiting the range/span. Range/
span maximums are outlined in the table below.
Range/span minimums are 0 for all units.
Display
P OUTPUT MAX
4.000“WC
STEP 4-10: PRESSURE OUTPUT MAX
Pressure unit DPT-Flow Series-4 model number
DPT-Flow-4 DPT-Flow-8 DPT-Flow-20 DPT-Flow-30
Pa 100–1,000 200–2,000 500–5,000 700–7,000
kPa 0.1–1.0 0.2–2.0 0.5–5.0 0.7–7.0
mbar 1–10 2.0–20 5.0–50 7.0 –70
mmWC 10–100 20–200 50–500 70–700
inWC 0.4–4.0 0.8–8.0 2.0–20 2.5–30
Pressure output
Upper range/maximum settings
Example: The DPT-Flow-4 has a capable range of 0–4.0 inWC.
If pressure readings are expected below 2.50 inWC, adjust the
pressure output maximum to 2.50 inWC to improve the resolution.
The range/span will be adjusted to 0.0–2.50 inWC. The DPT-Flow-4
can have the pressure output maximum set between 0.4–4.0 to
improve resolution.
1) Highlight submenu, the top line of the display will show P
OUTPUT MAX and the bottom line will change to a blinking
number equal to the maximum output.
2) Cycle up or cycle down by tilting joystick 2 or 3 respectively to
increase or decrease the value shown on the display.
3) Confirm selection when the correct value is shown on the
display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-11.
Continuing from the selection of the pressure
output maximum.
1) Highlight submenu, the display will show
FLOW UNIT and m3/s will be blinking.
2) Cycle up or cycle down to select the correct
flow unit.
3) Confirm selection by tilting joystick 1 when the
correct option is shown on the display.
4) Cycle down to the next step in configuring
the device. For the next configuration step in
these installation instructions, go to step 4-12.
Display
Flow units
Volume
m3/s
m3/h
CFM
l/s
Velocity
m/s
FPM
Menu
STEP 4-11: FLOW UNIT
FLOW UNIT
m3/s
Continuing from the selection of the duct height.
1) Highlight submenu, the display will show
PROBE QTY and 1will be blinking.
2) Cycle up or down by tilting joystick 2 or 3
respectively, to increase or decrease the
number of probes installed.
Display
PROBE QTY
1
3) Confirm selection when the correct value is shown on the display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-8.
STEP 4-7: PROBE QUANTITY

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
1) Highlight submenu, the top line of the display will show V
OUTPUT MAX and the bottom line will change to a blinking
number equal to the maximum output.
2) Cycle up or cycle down by tilting the joystick 2 or 3 respectively to
increase or decrease the value shown on the display.
3) Confirm selection when the correct value is shown on the display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-13.
Continuing from the selection of flow (v) output
maximum setting.
This device supports response time settings
from 1–20 seconds. Increasing the response
time can reduce the influence of air turbulence.
Display
RESPONSE TIME
20 s
1) Highlight submenu, the top line of the display will show
RESPONSE TIME and the number 20 will be blinking.
2) Cycle up or cycle down to increase or decrease the number of
seconds required.
3) Confirm selection when the correct value is shown on the display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-14.
STEP 4-13: RESPONSE TIME
STEP 4-14: RESET SETTINGS
Continuing from the selection of the response
time setting.
This device supports a reset to factory settings.
1) Highlight submenu, the display will change to
CONFIRM RST and NO will be blinking.
2) Cycle up or cycle down between the options of
NO and YES.
3) Confirm selection when the correct option is
shown on the display.
4) Cycle down to the next step in configuring the
device. For the next configuration step in these
installation instructions, go to step 4-15.
Display
RESET SETT.
PRESS SELECT
Display selected
CONFIRM RST
NO
Continuing from the selection of resetting the
factory settings.
Confirm selection to exit the configuration menu
by tilting joystick 1. The device is now ready to
be used.
Display
SELECT
EXIT MENU
STEP 4-15: EXIT MENU
Continuing from step 4-1 selection of the fan
manufacturer.
1) Determine if the fan manufacturer is included
in the list of included fan manufacturers in the
menu.
2) Highlight submenu, the display will show
SEL: FAN MFG and the menu of fan
manufacturers.
If the fan manufacturer is included in the menu,
then:
3a) Cycle up or cycle down through the list of
manufacturers until the correct one is shown
on the display.
4a) Confirm selection when the correct option is
shown on the display.
5a) Cycle down to the next step in configuring
the device. For the next configuration step in
these installation instructions, go to step 4-19.
Display
Fan Mfg
Comefri
ebm-papst
Fläkt Woods
Gebhardt
Nicotra
Rosenberg
Ziehl
Other
Menu
STEP 4-16: SELECT FAN MANUFACTURER
SEL:FAN MFG
FläktWoods
If the fan manufacturer is not included in the menu, then:
3b) Cycle up or cycle down through the list of manufacturers until
OTHER is shown on the display.
4b) Confirm selection when the correct option is shown on the
display.
5b) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-17.
Continuing from the selection of the flow unit.
This device supports velocity or volume output
maximum settings to improve resolution of the
flow reading by limiting the range/span. Range/
span maximums are outlined in the table below.
Range/span minimums are 0 for all units.
Display
V OUTPUT MAX
100000 CFM
STEP 4-12: V OUTPUT MAX
Volume
Flow unit
Output
maximum setting
Velocity
Flow unit
Output
maximum setting
m3/s 0.025–50 m/s 1–100
m3/h 100–200,000 FPM 2,000–20,000
CFM 50–100,000
l/s 25–50,000
Flow output
Volume or velocity upper range/maximum settings
Example: DPT-Flow has an effective flow volume range of
0–100,000 CFM. If flow volume readings are expected below
15,000 CFM, adjust the V output maximum to 15,000 CFM to
improve resolution. The range/span will be adjusted to 0.0–15,000
CFM. The DPT-Flow-4 can have the V output maximum set
between 50–100,000 CFM to improve resolution.

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
1) Highlight submenu, the display will change to
FLOW UNIT and m/s will be blinking.
2) Cycle up or cycle down to select the correct
flow unit.
3) Confirm selection when the correct option is
shown on the display.
4) Cycle down to the next step in configuring
the device. For the next configuration step in
these installation instructions, go to step 4-19.
Flow units
Volume
m3/s
m3/h
CFM
l/s
Velocity
m/s
FPM
Menu
Continuing from step 4-16 or step 4-18.
1) Highlight submenu, the top line of the display
will show SEL: K-VALUE and the bottom line
will begin to blink.
2) Cycle up or down by tilting joystick 2 or 3
respectively to increase or decrease the value
shown on the display. If the desired number is
passed, then tilt the opposite joystick to cycle
back within 1.25 seconds, after which the
display will begin to blink indicating that the
steps 2 and 3 must be repeated.
Display
SEL:K-VALUE
1.000
3) Confirm selection when the correct value is shown on the display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-8.
STEP 4-19: SELECT K-VALUE
Each pre-configured fan manufacturer has its own equation,
K-value, K-value range, and equation units (flow and pressure), see
table below. By selecting a pre-configured fan manufacturer from
the menu, the correct configuration settings for that manufacturer
will automatically be configured into the DPT-Flow S-4.
FAN MANUFACTURER’S EQUATIONS
Fan
manufacturer
Manufacturer’s
equation
K-value
range
Formula
unit flow
Formula
unit
pressure
Fläkt Woods 0.3–99 m3/s Pa
Rosenberg 37–800 m3/h Pa
Nicotra 10 –1,500 m3/h Pa
Comefri 10–2,000 m3/h Pa
Ziehl-Abegg 10 –1,500 m3/h Pa
ebm-papst 10 –1,500 m3/h Pa
Gebhardt 50–4,700 m3/h Pa
√
1
k
Q= ∆P
*
Q= k *2* ∆P
ρ
√
Q= k *2* ∆P
ρ
√
Q= k *2* ∆P
ρ
√
Q= k *2* ∆P
ρ
√
Q= k *√
∆P
Q= k *√
∆P
Q = Air volume in (m3/s, m3/h, CFM, l/s)
k = KVOL (K-value for air volume) in (flow unit/pressureunit)
∆P= Differential pressure measured by the FloXact probe
ρ = Density of the gas (air) in (kg/m3) or (lb/ft3).
- at 20 °C, 1013.25 mbar, and 50 % rH, air has a density
of 1.2041 kg/m3
- at 70 °F, 14.6956 psi, and 50 % rH, air has density of
0.074887 lb/ft3.
- The correction for different densities is determined with
the following formulas:
Metric USA
correction = correction =
√ρ
1.2041 √ρ 0.074887
STEP 4-18: OTHER FORMULA UNIT: FLOW
Continuing from the selection of OTHER: Formula
unit: pressure.
The formula unit for flow will be supplied by the
fan manufacturer or probe manufacturer. The
DPT-Flow can accept several options in the
flow units menu. If the flow unit supplied by the
manufacturer is different than menu options,
then convert the supplied value to one of the
listed.
Display
FORMULA UNIT
FLOW
FLOW UNIT
m/s
Display selected
STEP 4-17: OTHER FORMULA UNIT: PRESSURE
Continuing from step 4-16: Other Fan Mfg OR
Step 4-2: OTHER: Probe.
The formula unit for pressure will be supplied by
the fan manufacturer or probe manufacturer. The
DPT-Flow can accept Pa or inWC. If the pressure
unit supplied by the manufacturer is different,
then convert the supplied value to Pa or inWC.
1) Highlight submenu, the display will change to
PRESS. UNIT and Pa will be blinking.
Display
FORMULA UNIT
PRESSURE
Display selected
PRESS.UNIT
Pa
2) Cycle up or cycle down between the options of Pa and inWC.
3) Confirm selection when the correct option is shown on the
display.
4) Cycle down to the next step in configuring the device. For the
next configuration step in these installation instructions, go to
step 4-18.

Copyright HK Instruments, Inc. 2017 www.hkinstrumentsinc.com Installation version 2.0 2017
HK Instruments, Inc. (HK)
(a) WARRANTY COVERAGE: HK warrants to the original end user of the Products that
the Products will, at the date of initial purchase, meet the applicable specification for
such Products (as described by HK in its product literature) and, under normal use and
service, will be free from any defects in materials or manufacture for (a) one (1) year
from date of sale to end user for electromechanical Products and (b) five (5) years from
date of manufacture for electronic Products.
(b) NO WARRANTY OF PRODUCT SUITABILITY: Neither HK nor the manufacturer of
the Products to be sold hereunder (“Manufacturer”) makes any warranty that Products
are suitable for a particular purpose, application or design. Many states and localities
have differing codes or regulations governing the installation and/or use of HK
products. HK does not guarantee compliance with such codes or regulations; the end
user is solely responsible for safe and correct installation and use of the Products and
for compliance with such codes and regulations.
(c) EXCLUSION OF IMPLIED WARRANTIES: THE WARRANTY HEREIN IS THE
ONLY WARRANTY APPLICABLE TO THE PRODUCTS AND EXCLUDES ALL OTHER
WARRANTIES, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, AND ANY IMPLIED WARRANTY ARISING FROM
COURSE OF DEALING OR USAGE OF TRADE.
(d) REMEDIES FOR NON-CONFORMITY OR BREACH OF WARRANTY: If the Product
purchased does not conform to the applicable warranty, HK will provide, at its
option, one of the following remedies: (1) repair of the non-conforming Product, (2)
replacement with a conforming Product, or (3) refund of the original purchase price.
THESE REMEDIES SHALL BE THE EXCLUSIVE AND SOLE REMEDY for any breach
of warranty. HK and Manufacturer have no other responsibility or liability for breach of
warranty or otherwise.
(e) LIMITATION OF LIABILITY: NEITHER HK NOR MANUFACTURER WILL BE LIABLE
FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
UNDER ANY CIRCUMSTANCE, INCLUDING WITHOUT LIMITATION ANY DEFECT IN
THE PRODUCT PURCHASED.
(f) FURTHER LIMITATIONS: The warranty herein does not cover damage caused
by lightning, flood or other natural phenomenon; normal wear and tear; accident,
improper or careless handling, abnormal use, overloading, improper storage or abuse;
incorrect installation, care or reconstruction; or alteration, calibration, reconfiguration,
maintenance or installation work done by unqualified personnel. Should Manufacturer
alter the structure of any Product in the future, HK and Manufacturer shall not be
obligated to make comparable changes to Products already purchased. HK will give
a new warranty for Products being replaced or repaired within the warranty period,
however only to the expiration of the original Product’s warranty period. The warranty
includes the repair of a defective part or device, or if needed, a new part or device, but
no other costs except as otherwise stated in the HK Distributor Terms and Conditions.
The parts left over from installation should be
recycled according to your local instructions.
Decommissioned devices should be taken to
a recycling site that specializes in electronic
waste.
RECYCLING/DISPOSAL
WARRANTY POLICY
ZEROING THE DEVICE
To zero the device two options are available:
1) Manual Pushbutton zero point calibration
2) zero point calibration function
Does my transmitter have an function? See the product label.
If it shows -eZ in the model number, then you have the func-
tion.
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 down the zero button until the LED light (red) turns on and
the display reads “zeroing”. (see figure 3)
c) The zeroing of the device will proceed automatically. Zeroing is
complete when the LED turns off, and the display reads 0.
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 −.
a) Disconnect both pressure tubes from the pressure ports labeled
+ and –.
b) Push down the zero button (joystick) until the LED light (red)
turns on and the display reads “zeroing” (display option only). (see
Figure 6)
c) The zeroing of the device will proceed automatically. Zeroing is
complete when the LED turns off, and the display reads 0 (display
option only).
d) Reinstall the pressure tubes, ensuring the High pressure tube is
connected to the port labeled +, and the Low pressure tube is
connected to the port labeled −.
Press down button
LED turns ON
Display reads “Zeroing”
LED
Figure 3
2) function
If the device includes the optional circuit, no action is required.
(-eZ) is an autozero function in the form of an automatic zero-
ing circuit built into the PCB board. The function 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 peri-
odic transmitter zero point calibration. The 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 are virtually maintenance free.