Copyright HK Instruments 2019
www.hkinstruments.fi
Installation version 7.0 2019
NOTE! Always zero the device before use.
To zero the device two options are available:
1) Manual 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 autozero
calibration.
1) Manual 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 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 l, and the Low pressure tube is
connected to the port labeled −.
NOTE: The zero point should be calibrated via manual zero point
calibration 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
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quired.
Autozero calibration (-AZ) is an autozero function in the form of an auto
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matic zeroing circuit built into the PCB board. The autozero calibration
electronically adjusts the transmitter zero at predetermined time inter
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vals (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 perform
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ing initial or periodic transmitter zero point calibration. The autozero
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.
The seller is obligated to provide a warranty of five years for the deliv
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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
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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, normal wear
and tear, improper or careless handling, abnormal use, overloading, im
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proper storage, incorrect care or reconstruction, or changes and instal
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lation work not done by the seller or his/her authorized representative.
The selection of materials for devices prone to corrosion is the buyer’s
responsibility, unless otherwise is legally agreed upon. Should the man
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ufacturer 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 ex
-
change costs. Under no circumstance is the seller liable for damages
compensation for indirect damage.
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.
STEP 4: ZEROING THE DEVICE
WARRANTY POLICY