Copyright HK Instruments 2022
www.hkinstruments.fi
Installation version 1.0 2022
The seller is obligated to provide a warranty of five years for the deliv-
ered 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 before expira-
tion of the warranty, to amend the mistake at his/her discretion 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 comprise damages
caused by accident, lightning, flood or other natural phenomenon, nor-
mal wear and tear, improper or careless handling, abnormal use, over-
loading, improper storage, incorrect care or reconstruction, or changes
and installation work not done by the seller. The selection of materi-
als for devices 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 de-
livery and stated in the contract. The seller will give a new warranty for
goods that have been replaced or repaired within the warranty, how-
ever 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
circumstance is the seller liable for damages compensation for indirect
damage.
2) 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 l
and –.
b) Push down the zero button until the LED light (red) turns on and
the display reads “zeroing” (display option only). (see figure 3)
c) The zeroing of the device will proceed automatically in 4 seconds.
Zeroing is complete when the LED turns off, and the display reads
0 (display option only).
d) Reinstall the pressure tubes ensuring that the High pressure tube
is connected to the port l, and the Low pressure tube is
connected to the port labeled −.
3) Via Modbus register
Make sure there is no pressure in the duct when the zeroing is done
via Modbus register.
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 l, and the Low pressure tube is
connected to the port labeled −.
Press down button
LED turns ON
Display reads “Zeroing”
LED
Figure 3
ZEROING THE DEVICE
CONTINUED
STEP 5: MODBUS REGISTERS
Register
Parameter description
Data Type
Value
Range
3x0001
Program version
16 bit
0...9900
0,00...99,00
3x0002
Pressure reading Pa
16 bit
-24900...24900 *
± 2490.0 Pa
3x0003
Pressure reading kPa
16 bit
-24900...24900 *
± 2.4900 kPa
3x0004
Pressure reading mbar
16 bit
-24900...24900 *
± 24.900 Pa
3x0005
Pressure reading mmWC
16 bit
-25400...25400 *
± 253.91 mmWC
3x0006
Pressure reading inWC
16 bit
-10000...10000 *
± 10.000 inWC
3x0007
Pressure reading psi
16 bit
-3610...3610 *
± 0.3611 psi
3x0008
Flow m3/s
16 bit
0...10000
0...100 m3/s
3x0009
Flow m3/h
16 bit
0...30000
0...30000 m3/h
3x0010
Flow cfm
16 bit
0...30000
0...30000 cfm
3x0011
Flow l/s
16 bit
0...3000
0...3000 l/s
3x0012
Velocity m/s
16 bit
0...1000
0...100 m/s
3x0013
Velocity f/min
16 bit
0...5000
0...5000 f/min
Function code 04 - Read input register
MODBUS REGISTERS
CONTINUED
Function code 05 - Write single coil
Register
Parameter description
Data Type
Value
Range
0x0001
Zero point calibration
Bit 0
0...1
On - Off
WARRANTY POLICY
RECYCLING/DISPOSAL
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.
*) The value and range are determined by the selected pressure range ±120 Pa, ±240 Pa, ±620 Pa,
±1240 Pa, ±2490 Pa. The values shown in the table when the largest area is selected.
Function code 03 - Read input holding register, Function code 06 -
Write single register, Function code 16 - Write multiple registers
Register
Parameter description
Data Type
Value
Range
4x0001
Manufacturer
16 bit
0...8
0=Fläkt Woods, 1=Rosenberg,
2=Nicotra-Gebhardt, 3=Comefri,
4=Ziehl, 5=ebm-papst, 6=Gebhardt,
7=Nicotra, 8=Common probe
4x0002
Formula unit (if manufacturer
selection = common probe)
16 bit
0...5
0: m3/s, 1: m3/h, 2: cfm, 3: l/s,
4: m/s, 5: f/min
4x0003
K-factor integer
16 bit
0...9999
0...9999
4x0004
K-factor decimal
16 bit
0...999
0...999
4x0005
Response time
16 bit
0...20
0=0.4 s, 1=1 s, 2=2 s...20=20 s
4x0006
Pressure Range
16 bit
0...4
0=±120 Pa, 1=±240 Pa, 2=±620 Pa,
3=±1240 Pa, 4=±2490 Pa
