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| INTRODUCTION |
| Temperature controllers allow, through temperature desired value’s statement (set-point), to check and to keep the temperature prearranged value of the warming element steady, comparing the value pointed out by the sensor with the one adopted by the user. Elco temperature controllers can be analogue or microprocessor-based type. Particularly microprocessor-based tools, thanks to easiness and flexibility of parameters’ planning, offer a wide possibility of temperature’s adjustment. A lot of these instruments have, besides PID control, also the AUTOTUNNING function which allow to calculate regulation parameters automatically. Most of microprocessor based tools can use, as input signals for temperature’s control, besides traditional thermocouple or thermoresistance probes, also analogue signals in current or in voltage and through HEATER BREAK function can point-out incidental failures or interruptions of the warming element. Flexibility to various applications of ELCO temperature controllers is easily verifiable also from the number and typology of outputs, both principal and auxiliary that they have. The main output is used for keeping the layed out temperature and it’s coupled with secondary outputs used to signal alarms, interruption of the warming element, heating or cooling phases, etc. The type of intervention and modalities of output’s switchover are fixed at the moment of temperature controller’s programming. |
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TYPES OF REGULATION
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| Types of regulation that temperature controllers can realized are:
ON-OFF regulation:
temperature adjustment simple and fairly slow, very sensitive to power-supply or load variations. Output is ON state for temperature lower than prearranged value (set-point), whereas it’s OFF state for higher temperature.
“P” regulation (proportional):
this type of adjustment is adopted when we want remove temperature’s hysteresis on the warming element typical of ON-OFF regulation. In this sense user defines two temperature (proportional band) which include set-point, where the temperature’s regulation is carried out with continuity in conformity with a time called proportional cycle (duty cycle) during which output’s ON and OFF times change. This type of adjustment allow a good temperature’s steadiness but it’s characterized from a temperature’s difference as regards set point’s value (offset).
“PD” regulation (proportional-derivative) :
Proportional – derivative regulation with the addition of “P” regulation allow to make a quick return to set-point value in case of a rapid variation of temperature caused by strong exterior troubles.
“PID” regulation (proportional-integrated- derivative):
pid regulation allow temperature’s control using at the same time PD action and the integral "I" action with whom we can remove the temperature’s offset typical of the proportional regulation automatically.
auto-tuning :
auto-tuning function allow to temperature controller, throught a selflearning cycle, to calculate automatically all optimal values of PID action’s parameters basing on characteristics of element to warm. |
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As support at its own temperature controllers, the company ELCO can supply a complete range of temperature probes.
a) Thermocouple (J, K, S, R, T, type, etc.)
temperature range: til 1800 °C – class of accuracy: 1 or 2 – reference regulations:
IEC 584-2
b) Thermoresistance (Pt100 or Ni 100)
temperature range: from –200 °C to +850 °C – class of accuracy: A or B – reference regulations: IEC 571
c) Thermistor (PTC kty 81 types)
temperature range: from –50 °C to +150 °C
All probes are moreover available in different shapings, formats, prods and types of cables also on customer’s specification. |
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ANALOGUE ELECTRONIC TEMPERATURE CONTROLLER
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• Input for temperature probes TC J, TC K, Pt 100
• 1 relay or voltage output for SSR
• ON/OFF or proportional control
• Octal – 8 pins socket connections
• 10 scales available from –50 °C to 1200 °C
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TECHNICAL DATA
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| Power supply: |
24, 110, 230 VAC +/- 10% f: 50/60 Hz |
| Power consumption: |
3 VA approx |
| Input(s): |
1 input for temperature probes tc J, tc K, Pt 100 IEC |
| Output(s): |
1 relay (8A/250V AC1) oo voltage output for SSR drive (12 VDC/20 mA) |
| Case: |
self-extinguishing plastic, UL 94 VO |
| Dimensions: |
front panel DIN 48 x 48 mm, depth 89 mm |
| Mounting: |
flush in panel in 45,5 x 45,5 mm hole |
| Connection: |
OCTAL – 8 pins socket |
| Degree of protection of front panel: |
IP 54, mounted on the panel with seal |
| Control |
ON/OFF of proportional |
| Operation: |
ON/OFF with 3 °C hysteresis, and proportional with 10 °C and 25 sec. Cycle time |
| Measurement range: |
according to the probe used and the scale chosen. Scales available from – 50 °C to 1200 °C |
| Overall accuracy: |
tc: +/- 2% fs, Pt100: +/- 1% fs |
| Compliance: |
EEC directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC directive LV 73/23 and 93/68 (EN 60730-1) |
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MICROPROCESSOR-BASED DIGITAL ELECTRONIC CONTROLLER
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• 1 input for TC (J, K, S) RTD (Pt 100, Ni 100), PTC or normalized signals 4…20 mA, 0…20 mA, 0…10V
• 1 or 2 relay or voltage output for SSR
• Programmable direct action (refrigeration, dehumidification, etc.) or reverse action (heating, humidification, etc.)
• Programmable pid, ON/OFF and neutral zone control
• Autotuning and dynamic set point functions
• 3 led deviation index
• Plug-in PCB |
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TECHNICAL DATA
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| Power supply: |
24VDC, 24, 48, 110, 230 VAC +/- 10% f: 50/60 Hz |
| Power consumption: |
5 VA approx |
| Input(s): |
1 input for temperature probes tc (J, K, S) or RTD (Pt 100 IEC, Ni 100) or PTC (KTY 81-121 990  at 25 °C) or normalized signals 4…20 mA, 0…20 mA, 0…10 V |
| Output(s): |
up to 2 outputs either relay (8A/250V AC1); or voltage for SSR drive (21 VDC,20 mA) |
| Case: |
self-extinguishing plastic, UL 94 VO |
| Dimensions: |
front panel DIN 48 x 48 mm, depth 107 mm |
| Mounting: |
flush in panel in 45,5 x 45,5 mm hole |
| Connection: |
Screw connection (Faston 6,3 mm by request) |
| Degree of protection of front panel: |
IP 54, mounted on the panel with seal |
| Control |
PID, ON/OFF, Neutral Zone |
| Measurement range |
according to the probe used. Display scale –999…9999 max. |
| Display resolution |
according to the probe used. 1/0,1/5/0,5 |
| Overall accuracy |
+/- 0,5% fs |
| Sampling rate |
1 sample per second |
| Compliance |
EEC directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC directive LV 73/23 and 93/68 (EN 60730-1) |
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MICROPROCESSOR-BASED DIGITAL ELECTRONIC CONTROLLER
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• 1 input for temperature probes or for normalized signals and 1 input for current transformer
• 1 or 2 control outputs or alarm, either relay, voltage for SSR or analogue
• ON/OFF control, single action PID control, double action PID control (direct and reverse)
• Autotuning and heater break functions
• Plug-in PCB |
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TECHNICAL DATA
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| Power supply: |
24 VAC/VDC, 90…240 VAC +/- 10% f: 50/60 Hz |
| Power consumption: |
5 VA approx |
| Input(s): |
1 input for temperature probes (tc, J, K, R, S, T; RTD Pt 100 IEC) or normalized signals 0/4…20 mA, 0/1…5 V, 0/2…10 V. 1 input for current transformer with K = 1/0.002 |
| Output(s): |
up to 2 outputs, either relay (6A/250V AC1); or voltage for SSR drive (24 VDC, 25 mA); or analogue 0/4…20 mA, 0/2…10 V |
| Case: |
self-extinguishing plastic, UL 94 VO |
| Dimensions: |
front panel DIN 48 x 48 mm, depth 107 mm |
| Mounting: |
flush in panel in 45,5 x 45,5 mm hole |
| Connection: |
Screw connection(Faston 6,3 mm by request) |
| Degree of protection of front panel: |
IP 54, mounted on the panel with seal |
| Control |
ON/OFF, single action PID, double action PID |
| Measurement range |
according to the probe used. Display scale –999…9999 max |
| Display resolution |
according to the probe used. 1/0.1 |
| Overall accuracy |
+/- 0.25% fs (temperature input); +/- 0,15% fs (normalized signal input) |
| Sampling rate |
1 sample per second |
| Compliance |
EEC directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC directive LV 73/23 and 93/68 (EN 60730-1) |
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MICROPROCESSOR-BASED DIGITAL ELECTRONIC CONTROLLER
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• 1 input for temperature and 1 input for current transformer
• 1 or 2 control outputs (OUT1 and OUT2), either relay, voltage for SSR and up to 3 alarms outputs (AL1, 2, HB), either realy or voltage for SSR
• ON/OFF control, single action PID control, double action PID control (direct and reverse)
• Autotuning and heater break functions
• Plug-in PCB |
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TECHNICAL DATA
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| Power supply: |
24 VAC/VDC, 90…240 VAC +/- 10% f: 50/60 Hz |
| Power consumption: |
10 VA approx |
| Input(s): |
1 input for temperature probes (tc, J, K, R, S, T; RTD Pt 100 IEC), 1 input for current transformer with K = 1/0.002 |
| Output(s): |
up to 5 outputs, either relay (6A/250V AC1); or voltage for SSR drive (24 VDC,25 mA) |
| Case: |
self-extinguishing plastic, UL 94 VO |
| Dimensions: |
front panel DIN 48 x 96 mm, depth 100 mm |
| Mounting: |
flush in panel in 45 x 92 mm hole |
| Connection: |
6,3 mm Faston |
| Degree of protection of front panel: |
IP 54, mounted on the panel with seal |
| Control |
ON/OFF, single action PID, double action PID |
| Measurement range |
according to the probe used. Display scale –999…9999 max |
| Display resolution |
according to the probe used. 1/0.1 |
| Overall accuracy |
+/- 0.25% fs |
| Sampling rate |
1 sample per second |
| Compliance |
EEC directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC directive LV 73/23 and 93/68 (EN 60730-1) |
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| MICROPROCESSOR-BASED DIGITAL ELECTRONIC TEMPERATURE CONTROLLER |
• 1 PTC probe input
• 1 Relay output
• Programmable direct action (refrigeration) or reverse action (heating)
110 or 230 Vac direct power supply
• Function which protects the compressor against frequent start-stop operations (short-cycles)
• Auxiliary digital input and alarm by internal buzzer
• IP 65 front panel |
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| TECHNICAL DATA |
| Power supply: |
12, 24 VAC/VDC, 110, 230 VAC +/- 10%f: 50/60 Hz |
| Power consumption: |
3 VA approx |
| Input(s): |
1 input for PTC temperature probe (KTY 81-121 990 ohm at 25°) and 1 digital input for free-voltage contacts |
| Output(s): |
1 really output (8A/250V AC1) |
| Case: |
Self-extinguishing plastic, UL 94 VO |
| Dimensions: |
Front panel 33 x 75 mm, depth 64 mm |
| Mounting: |
Flush in panel in 29 x 71 mm hole |
| Connection: |
2,5 mm quadrati screw terminal block |
| Degree of protection |
IP 65, mounted on the panel with seal |
| Control |
ON/OFF |
| Measurement range |
-50…150 °C/-58…199°F |
| Display resolution |
1° in all range or 0,1° in range between -19,9 and 19,9 |
| Overall accuracy |
+/- 0,5% fs |
| Sampling rate |
1 sample per second |
| Compliance |
EEC Directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC Directive LV 73/23 e 93/68 (EN 60730-1) |
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| MICROPROCESSOR-BASED DIGITAL ELECTRONIC CONTROLLER |
• 1 input for TC (j,k,s), RTD (Pt 100, Ni 100), PTC or normalized signal 4…20mA, 0…20mA, 0…10V
• 1 or 2 relay or voltage outputs for SSR
• Programmable direct action (refrigeration, dehumidification, etc.) or reverse action (heating, humidification, etc.)
• Programmable PID, On/Off and neutral zone control
• Autotuning and dynamic set point functions
• Ip 65 front panel
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| TECHNICAL DATA |
| Power supply: |
12 VAC/VDC, 24 VAC/VDC, +/- 10%f: 50/60 Hz |
| Power consumption: |
3 VA approx |
| Input(s): |
1 input for temperature probes TC (j,k,s) o RTD (Pt 100, Ni 100) o PTC (KTY 81-121 990 ohm a 25°) or normalized signals 4…20mA, 0…20mA, 0…10V |
| Output(s): |
Up to 2 outputs, either relay (8A/250V AC1), or voltage for SSR drive (12 VDC/20mA) |
| Case: |
Self-extinguishing plastic, UL 94 VO |
| Dimensions: |
Front panel 33 x 75 mm, depth 64 mm |
| Mounting: |
Flush in panel in 29 x 71 mm hole |
| Connection: |
2,5 mm quadrati screw terminal block |
| Degree of protection of front panel |
IP 65, mounted on the panel with seal |
| Control |
PID, ON/OFF, Neutral zone |
| Measurement range |
According to the probe used. Display scale –99…999 max. |
| Display resolution |
According to the probe used. 1/0,1/5,0,5 |
| Overall accuracy |
+/- 0,5% fs |
| Sampling rate |
1 sample per second |
| Compliance |
EEC Directive EMC 89/336 (EN 50081-1, EN 50082-1), EEC Directive LV 73/23 e 93/68 (EN 60730-1) |
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