Chromalox 1601, Руководство пользователя, Страница: 28 / 32

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B) RTD ( R esistance T emperature D etector)
Type : Pt 100 3 wires connection.
Current : 135
m
A.
Line resistance : automatic compensation up to
20
W
/wire with :
- error <+0.1% of the input span for range -19.9 a
99.9 °C.
- not measurable error for the other ranges.
Engineering units : °C or °F programmable.
Burn-out : up scale. NOTE : a special test is
provided to signal OVERRANGE when input
resistance is less than 15
W
.
Calibration : according to DIN 43760
STANDARD RANGES TABLE
CONTROL ACTIONS
Control actions
: PID + SMART
Proportional band : from 1.0 % (for heating
action) or 1.5 % (for heating and cooling action) to
99.9 % of the input span.
Setting Pb = 0 an ON/OFF control is performed.
Hysteresis (for ON/OFF control action): from 0.1
% to 10.0 % of the input span.
Integral time : from 10 seconds to 20 minutes;
resolution 10 second. Setting a value upper than
20 minutes the integral action will be excluded.
Derivative time : from 0 to 9 minutes and 59
seconds.
Integral preload:
- from 0 to 100% for one control output.
Heating cycle time : from 1 to 200 s.
NOTE : the PB, TI and TD parameters may be
limited when the SMART function is enabled.
CONTROL OUTPUTS
OUTPUT 1 - heating :
a) Relay output with SPDT contact;
contact rating 3A / 250 V ac on resistive load.
b) Logic voltage for SSR drive.
Logic status 1: 24 V +20% @ 1 mA.
14 V +20% @ 20 mA
Logic status 0: <0.5 V
Output action : direct/reverse programmable
OUTPUT 2 - alarm 1:
a) Relay output with SPST contact;
contact rating 1A / 250 V ac on resistive load.
By internal jumper it is possible to select the
NC or NO contact.
MAINTENANCE
1) REMOVE POWER FROM THE POWER
SUPPLY TERMINALS AND FROM RELAY
OUTPUT TERMINALS
2) Remove the instrument from case.
3) Using a vacuum cleaner or a compressed air jet
(max. 3 kg/cm 2 ) remove all deposit of dust and
dirt which may be present on the louvers and
on the internal circuits trying to be careful for
not damage the electronic components.
4) To clean external plastic or rubber parts use
only a cloth moistened with:
- Ethyl Alcohol (pure or denatured) [C
2
H
5
OH] or
- Isopropil Alcohol (pure or denatured)
[(CH
3
)
2
CHOH] or
- Water (H
2
O)
5) Verify that there are no loose terminals.
6) Before re-inserting the instrument in its case, be
sure that it is perfectly dry.
7) re-insert the instrument and turn it ON.
RTD
TYPE
RTD Pt 100
RTD Pt 100
-199 - +500 °C
-19.9 - +99.9 °C
Measuring range
-199 - +999 °F
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1601-1-0C.p65 5/2/00, 1:45 PM 23