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Brand: Pixsys
Pixsys ATR121 PID Temperature Controller 32×74 mm, 2 Relays
Description
ATR121 is the entry-level PID controller in the Pixsys range: a 32×74 mm panel unit with a three-digit red display, one universal analogue input, two relay outputs and a logic output for a solid state relay. It does ON-OFF, P, PI, PID or PD control, works as a plain indicator when the outputs are not needed, and is available for a low-voltage or a 230 V supply.
Two setpoints, three LEDs and a keypad in a 32 mm high bezel
The three-digit display shows the process value and three LEDs report the state of the command output (OUT1), the alarm output (OUT2) and serial activity (L1). The datasheet describes three operating modes selectable by parameter: visualizer, single setpoint and double setpoint, so the same hardware can serve as a simple indicator, a thermostat or a controller with a second threshold.
A distinctive item is the memory card. Parameters and setpoints are copied between controllers with a card that has its own coin battery (code 2100.30.003, about 1000 operations according to the manual), so a replacement unit can be loaded without powering either controller. The manual adds that parameters can only be transferred to a device with the same code.
What the datasheet and manual list
- 16-bit universal input: thermocouples, RTD and thermistor probes, 0/4-20 mA, 0-10 V, 0-40 mV and 6 kΩ or 150 kΩ potentiometers.
- Control: ON-OFF with hysteresis, P, PI, PID, PD time-proportioned, dead band, heating/cooling double PID, open/close logic for motorized valves.
- Alarms: absolute or threshold, band, high or low deviation, with optional manual reset.
- Manual tuning, or automatic tuning at switch-on and whenever the setpoint is raised above 35 %.
- LATCH ON function to teach scale limits from a linear potentiometer or transmitter, with virtual zero.
Technical specification
Supply and inputs
| Parameter | Specification |
|---|---|
| Versions | ATR121-AD and ATR121-B |
| Supply ATR121-AD | 12 to 24 V AC, 12 to 35 V DC (Class 2 source) |
| Supply ATR121-B | 230 V AC, 50/60 Hz, galvanic isolation 2500 V |
| Thermocouples | K, S, R, J; cold-junction compensation 0 to 50 °C |
| RTD / thermistor | PT100, PT500, PT1000, Ni100, PTC 1K, NTC 10K (beta 3435 K) |
| Linear signals | 0-10 V (40000 points), 0/4-20 mA (30000 points), 0-40 mV (manual) |
| Potentiometer | 6 kΩ and 150 kΩ (40000 points) |
| Accuracy at 25 °C | ±0.2 % of full scale ±1 digit per datasheet; the manual quotes ±0.5 % |
| Sampling time | 66 ms (15 Hz) |
Outputs
| Parameter | Specification |
|---|---|
| Relays | 2 relays, 250 V AC resistive: Q1 8 A, Q2 5 A (manual) |
| SSR / logic output | AD: 12 to 35 V DC, 30 mA; B: 8 V DC, 20 mA |
| Auxiliary supply | Same level as the logic output, for a 2-wire sensor |
| Setpoints | 2 setpoints; access protected by password |
Mechanical
| Parameter | Specification |
|---|---|
| Front / box | 32 x 74 mm front, 53 mm box depth; cut-out 28.5 x 70.5 mm, panel 2 to 8 mm |
| Display | 3 digits (0.56 in), red, plus 3 LEDs |
| Protection | Front IP54 (IP65 with gasket), box IP30, terminals IP20 |
| Operating conditions | 0 to 45 °C, 35 to 95 % RH, altitude up to 2000 m |
| Weight | Approx. 100 g |
| Terminals | 0.2 to 1.5 mm2 (AWG24 to 16), strip 7 to 8 mm, torque 0.5 Nm |
ATR121-AD or ATR121-B
The only choice is the supply. The AD code runs from a 12 to 24 V AC or 12 to 35 V DC source and drives an SSR at 12 to 35 V DC; the B code connects directly to a 230 V AC line and gives an 8 V DC SSR drive. Both have the same two relays, the same input list and the same keypad. No serial port is listed for this model in the datasheet, although the third LED is reserved for serial activity; for Modbus RS485 select the ATR124 or ATR144 -T versions.
Wiring and commissioning notes
The manual requires a switch or breaker near the unit and a 1 A fuse on the supply, and it limits use to indoor locations away from radiated heat, dust, corrosive gas, vibration and condensation. It warns that relay contacts used beyond their rated life can weld, so size the relay duty carefully or drive a contactor through the SSR output.
Enter configuration with the FNC key and the password 123; the password 999 restores factory defaults. For a heating/cooling loop set reG. to Hea with a non-zero proportional band and make the alarm the cooling output; the multiplier p.b.m runs from 1.00 to 5.00 and the coolant preset gives 1.00 for air, 1.25 for oil, 2.50 for water.
Where an entry-level controller fits
Common jobs are oven and furnace thermostats, heat-sealing bars, hot-water and process heaters, and pressure or level indication with a 4-20 mA transmitter and a pump alarm. The IP54 front suits indoor panels; if the panel is washed down or dusty, order the gasket and keep the box in a closed cabinet.
Related Pixsys items
The gasket for 32×74 panels (code 1600.00.082) and the memory cards 2100.30.003 and 2100.30.005 are named in the manual. For networked loops or NFC setup compare the ATR124.
Related Pixsys products: Pixsys ATR144 PID Controller 32x74 mm, Dual Display, Pixsys ATR124 PID Controller 32x74 mm, NFC, Modbus RTU, Pixsys ATR224 PID Controller 48x48 mm, NFC, Dual Display, Pixsys ATR171 PID Controller 72x72 mm, 4 Setpoints, Timer, Pixsys DRR244 DIN Rail PID Controller, 2 Loops, CT Input and Pixsys STR551 Process Indicator 48x96 mm, OLED, RS485.
Documents and quotation
Download the official Pixsys datasheet and manual for ATR121 from this page. As an independent supplier based in Muscat, Seven Star LLC supplies Pixsys items on request: use the quote form with the quantity you need. Check every value in the documents against your own specification before you order. Browse similar items in the category.
Datasheets & Documents
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About brand
Pixsys is an Italian manufacturer of process control and industrial automation instruments, founded in 1990 and based in the Venice area. Its range covers PID and temperature controllers, indicators, signal converters, PLCs, I/O modules and HMIs, and the company also builds customised control solutions. Pixsys develops and manufactures its products at its Italian headquarters.
Seven Star LLC is an independent supplier in Muscat. We list Pixsys controllers and indicators with the official datasheet and manual beside each listing, for panel builders and process engineers in Oman and the GCC.
Pixsys company profile
| Founded | 1990, Italy |
|---|---|
| Headquarters | Mellaredo di Pianiga, Venice area, Italy |
| Manufacturing | Developed and made in Italy |
| Product families | ATR panel PID controllers (32x74, 48x48 and 72x72 mm), DRR DIN-rail PID controllers, NFC-programmable controllers, indicators, signal converters, PLC-HMI units and I/O modules |
Pixsys product series
Panel-mount PID controllers include the ATR121 and ATR124 (32x74 mm, the ATR124 with NFC and Modbus RTU), the ATR144 with dual display, the ATR224 (48x48 mm) and the ATR171 (72x72 mm) with four setpoints and timer. DIN rail controllers include the DRR244 two-loop controller with CT input, the DRR450 for solid state relays and the 18 mm DRR460 with RS485 or CANopen.
The STR551 process indicator has an OLED display and RS485, and the CNV580 is a 4G LTE IIoT gateway that links field devices to the Pixsys Guard app.
Where Pixsys instruments are used
Temperature control of ovens, furnaces, extruders, moulds and heating zones, process indication on skids and machines, and remote monitoring of equipment over cellular networks.
Pixsys products we list
Ordering Pixsys instruments: what we need
Send the model and full ordering code, the sensor input (thermocouple type, RTD or analog signal), the outputs needed (relay, SSR or analog), the supply voltage, the communication option and the panel cut-out.
Facts checked against Pixsys datasheets and EtherCAT member profile, October 2026.
Browse Pixsys products by category: Controllers & Data Acquisition.
FAQ
Questions about the Pixsys ATR121 PID Temperature Controller 32×74 mm,
Answers from our engineering team on installation, compatibility and integration.
01Which supply versions exist?
ATR121-AD for 12 to 24 V AC or 12 to 35 V DC and ATR121-B for 230 V AC.
02Can it control heating and cooling?
Yes. The manual describes a dual-action loop with the command output as heating PID and the alarm as cooling, with air, oil or water presets.
03What is the default configuration password?
The manual gives 123 for entering configuration and 999 for loading default values.
04How is the panel cut out?
28.5 x 70.5 mm in a panel 2 to 8 mm thick, with the optional gasket for IP65.
05Does Seven Star LLC act as a Pixsys distributor?
No, we are an independent supplier in Muscat and supply Pixsys items on request rather than acting as a Pixsys channel partner.
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