F
Operating instructions
cod. 1592001330
1592001330 XC642C GB r1.0 07.06.2004.doc
rel. 1.0
Pa. 4 / 21
3.1 HOW TO SELECT THE GAS TYPE
The controller has memorised the relation between temperature and pressure for some gases.
Default gas is: r404.
If another gas is used, act as in the following:
1.
Enter the Programming mode by pressing the
Set
and
DOWN
key for 3s.
2.
Select the “
Pr2
” parameter. Then enter the password 3 –2 1.
3.
Select the
FtyP, kind of gas,
parameter.
4.
Press the “
SET
” key: the value of the parameter will start blinking.
5.
Use “
UP
” or “
DOWN
” to change the gas amount the following: . Select the gas among the following:
r22=
R22
; r404=
R404A
; 507=
R507
; 134=
134
; r717=
ammonia.
6.
Press “
SET
” to store the new value and move to the following parameter.
To exit
: Press
SET + UP
or wait 30s without pressing a key.
NOTE
: the set value is stored even when the procedure is exited by waiting the time-out to expire.
3.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES
If a instrument with the following part number is used: XC642C – xxxxF, it is pre-set to work with pressure
probe with the following range:
Code
Range
XC642C – xxxxA opp. xxxxE
-0.5 ÷11 bar (relative pressure)
XC642C – xxxxB
0÷30 bar (relative pressure)
If the probes you’re using have a different range act as in the following:
To set the pressure range of the
Probe 1
use the parameter::
PA04:
Adjustment of read out corresponding to 4mA
PA20
:
Adjustment of read out corresponding to 20mA
Practically these parameters has to be set with the start and end scale of the probe range.
WARNING:
set a value correspondent to
absolute pressure
. If the transducer measures relative pressure
increase the range of 1 bar.
E.I. PP11
relative pressure transducer, range -0.5÷11.0 bar. PA04=0.50; PA20=12.00.
PP30
relative pressure transducer, range: 0÷30bar. PA04=1.00; PA20=31.00.
How to do:
1.
Enter the Programming mode by pressing the
Set
and
DOWN
key for 3s.
2.
Select the “
Pr2
” parameter. Then enter the password 3 –2 1.
3.
Select the
PA04, adjustment of read out corresponding to 4mA,
parameter.
4.
Press the “
SET
” key: the value of the parameter will start blinking.
5.
Set the lower value of the probe range (lower value +1 if the probe detects relative pressure).
6.
Push the
SET
key to confirm the value. The
PA20: adjustment of read out corresponding to 20mA
parameter will be displayed.
7.
Set the higher value of the range (higher value +1 if the probe detects relative pressure).
8.
Push the
SET
key to confirm the value. Next parameter will be displayed.
3.3 HOW TO SET THE KIND OF DISPLAY: RELATIVE OR ABSOLUTE PRESSURE
After setting the probe range by means of the PA04, PA20, parameters, it’s possible to select if the absolute
or relative pressure has to be displayed.
The controller is pre-set for RELATIVE PRESSURE displaying.
If the
absolute pressure
has to be displayed, act as in the following:
