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
m
3
/s
m
3
/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
m
3
/s
Pa
Rosenberg
37–800
m
3
/h
Pa
Nicotra
10–1,500
m
3
/h
Pa
Comefri
10–2,000
m
3
/h
Pa
Ziehl-Abegg
10–1,500
m
3
/h
Pa
ebm-papst
10–1,500
m
3
/h
Pa
Gebhardt
50–4,700
m
3
/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 (m
3
/s, m
3
/h, CFM, l/s)
k
= K
VOL
(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/m
3
) or (lb/ft
3
).
- at 20 °C, 1013.25 mbar, and 50 % rH, air has a density
of 1.2041 kg/m
3
- at 70 °F, 14.6956 psi, and 50 % rH, air has density of
0.074887 lb/ft
3
.
- 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.
