The Acromag SP333 accepts one thermocouple or millivolt input and delivers two isolated, proportional current or voltage outputs. Therefore, it provides a practical way to send one temperature or low-level voltage signal to two separate monitoring, recording or control systems.
The SP333 supports J, K, T, R, S, E, B and N thermocouples, as well as ±100 mV inputs. In addition, users can select from 4–20 mA, 0–20 mA, 0–5 V, ±5 V, 0–10 V and ±10 V output ranges. Since each output operates independently, users can scale the two outputs differently and select either normal or reverse-acting operation.
Protect signals and connected equipment
The SP333 provides 1500 V isolation between the input, power supply and each output circuit. As a result, it helps protect connected equipment from transient surges, reduce electrical noise and prevent ground-loop measurement errors.
Furthermore, users can connect power through the terminal block, an optional DIN rail power bus or both. Using both connections provides power redundancy. Meanwhile, the compact 17.5 mm-wide DIN rail enclosure saves panel space, while the removable terminal blocks simplify wiring and maintenance.
Configure the SP333 quickly
Users can configure the SP333 through a USB connection with Acromag’s Windows software. Alternatively, the Acromag Agility mobile app supports configuration from a compatible Android phone or tablet.
The configuration software simplifies input and output scaling, calibration, signal filtering and other processing settings. Moreover, users can configure each output separately. For example, one output can send a 4–20 mA signal to a PLC, while the second can provide a voltage signal to another monitoring or recording device.
Key features of the SP333
- Accepts one universal thermocouple or ±100 mV input
- Supports J, K, T, R, S, E, B and N thermocouples
- Provides two isolated, independently scalable outputs
- Offers 0–20 mA and 4–20 mA current outputs
- Offers 0–5 V, ±5 V, 0–10 V and ±10 V voltage outputs
- Supports normal or reverse-acting output operation
- Includes selectable signal filtering
- Provides 1500 V isolation
- Accepts a wide 6–32 V DC power input
- Supports terminal-block and DIN rail bus power connections
- Allows redundant power connections
- Uses a space-saving 17.5 mm DIN rail enclosure
- Includes removable terminals for easier wiring
- Operates from –40°C to +75°C
- Withstands 25 g shock and 4 g vibration
- Meets CE requirements
- Carries UL/cUL Class I, Division 2 and ATEX/IECEx Zone 2 approvals
Where can you use the SP333?
The SP333 suits industrial applications that need to send one thermocouple or millivolt signal to two separate systems. For example, users can connect the same measurement to:
- A PLC and a data acquisition system
- A controller and a chart recorder
- A control system and a remote display
- Two independent monitoring systems
- Separate control and safety systems
Consequently, the SP333 can reduce the need for additional sensors while maintaining electrical isolation between connected devices.
Important configuration note
When a grounded computer and a grounded input signal connect to the SP333 during configuration, a ground loop may occur. For this reason, Acromag recommends using a USB isolator when configuring SP330 Series devices.
Metromatics supplies and supports Acromag signal conditioners throughout Australia and New Zealand. Contact our team for help selecting the right input, output and power configuration for your application.
