I N T R O D U C T I O N
C O N F I G U R A T I O N
The inhead 2-wire transmitter APAQ HRF is
intended for temperature measurement in industrial
environment. Input is 3-wire Pt100 sensor and out-
put is a temperature linear 4-20mA signal. The
burn-out detection is selecable, upscale or
downscale.
It is suggested that the calibration is checked at
least once a year. Recommended calibration
equipment is a resistance source and a mA-meter,
both with sufficient accuracy for your needed
calibration accuracy, and a 24 VDC power supply.
E.g. for a calibration accuracy of 0.1% we
recommend calibration instruments with an
accuracy of at least 0.02%.
The transmitter is polarity protected and will not
be damaged by connecting the power supply with
the wrong polarity, but the output will be 0 mA.
The maximum load in the output loop depends on
the supply voltage according to figure 6.
As all transmitters with potentiometer adjustments,
this transmitter must not be exposed to heavy
shocks or vibrations which may cause the trans-
mitter to get out of calibration.
To avoid ESD (Electro Static Discharge) to the trans-
mitter, which may cause permanent damage,
always ground yourself by touching some grounded
equipment before configuring the transmitter.
G E N E R A L I N F O R M A T I O N
(To be carried out after Configuration)
1. Connect the transmitter to power supply,
an input source and an ampere meter as
shown i figure 2.
2. Apply an input signal to give an output of
approximately 12 mA and leave the unit for
15 minutes, if possible in the
ambient
temperature it is intended to
work in.
3. Apply INmin corresponding to desired
minimum input signal.
4. Adjust the Z-potentiometer to get Iout=
4.00 mA.
5. Apply INmax corresponding to desired
maximum input signal.
6. Adjust the S-potentiometer to get
Iout=20.00 mA.
7. Repeat 3-6 until readings converge.
8. Secure the potentiometer with lacquer.
Calibration is completed.
(To be carried out before Calibration)
Setting is done with solder jumpers. There are 9 positions and each position consists of 3 solder
pads (see figure 1).
1. Select zero point in fig. 3. The solder jumper for position 9 is given for each interval in the figure.
2. Select span in table 1 (°C) or table 2 (°F).
3. Select burn-out detection in table 3.
4. Carry out the soldering of the jumpers according to the tables.
C A L I B R A T I O N
Pt100
C O N N E C T I O N S
