FNIRSI SG-004A 4-20mA Signal Generator for PLC Testing Malaysia
FNIRSI SG-004A 4-20mA Signal Generator for PLC Testing Malaysia When troubleshooting a PLC analog input, one of the most useful tests is to inject a known 4-20mA signal directly into the control system. The FNIRSI SG-004A Signal Generator is designed for this type of industrial testing and commissioning work. Instead of waiting for the actual pressure, temperature, level or flow transmitter to produce a signal, technicians can use the SG-004A to simulate the current signal and check how the PLC responds. Why Use a 4-20mA Signal Generator? Many industrial transmitters communicate with PLC, DCS and control systems using a 420mA current loop. Typical applications include: Pressure transmitters Level transmitters Flow transmitters Temperature transmitters Valve positioners Industrial process sensors When a system shows an incorrect reading, the problem may come from the sensor, transmitter, wiring, power supply, analog input card or PLC configuration. A signal generator helps technicians isolate the problem. Example: PLC Is Not Showing the Correct Reading Imagine a pressure transmitter normally outputs: 4mA = 0 bar 20mA = 10 bar If the PLC display is showing an incorrect pressure, disconnecting the transmitter and injecting a known signal can help with troubleshooting. For example: 4mA → PLC should display approximately 0 bar 12mA → PLC should display approximately 5 bar 20mA → PLC should display approximately 10 bar If the PLC responds correctly to the simulated signal, the problem may be related to the transmitter or field side. If the PLC still shows an incorrect value, technicians can investigate the wiring, analog input module, scaling or PLC configuration. More Than Just 420mA The advantage of the FNIRSI SG-004A is that it is not limited to basic current output. Depending on the required test, it can support multiple types of industrial signal simulation and measurement. This makes it useful for technicians working with: PLC systems DCS systems Transmitters Temperature instrumentation Process control equipment Industrial automation systems Instead of carrying separate basic signal sources for different jobs, technicians can use one multifunction instrument for a wider range of troubleshooting work. Who Is the SG-004A Suitable For? The FNIRSI SG-004A is particularly relevant for: Factory maintenance technicians Automation technicians Instrumentation technicians PLC programmers Control panel builders Machine commissioning engineers System integrators Technical training centres For Malaysian factories using increasing amounts of automation equipment, a portable signl generator can be useful for both commissioning and maintenance troubleshooting. SG-004A vs Multimeter A normal digital multimeter is excellent for measuring electrical signals. However, troubleshooting sometimes requires you to generate a known signal, not simply measure the existing signal. For example, a multimeter may tell you that a transmitter is currently producing 11.8mA. A signal generator allows you to deliberately send: 4mA 8mA 12mA 16mA 20mA into the appropriate test circuit and observe how the control system responds. That is why a signal generator and multimeter perform different roles in industrial troubleshooting. FNIRSI SG-004A in Malaysia For customers in Malaysia working with PLC, process control, industrial automation and instrumentation systems, the FNIRSI SG-004A provides a practical option for signal simulation and troubleshooting. Before connecting any signal generator to a PLC, DCS or process instrument, always confirm the input type, wiring configuration, loop power arrangement and permitted electrical range of the equipment being tested. Using the wrong connection or output mode may damage the instrument or control system. For product enquiries, application discussion or help selecting a suitable signal generator, you may send us a photo of your PLC, transmitter, control panel or existing instrument. MTM Precision Sdn Bhd Showroom & Service Centre No. 29-1 & 2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia. Tel: 03-8080 7172 WhatsApp: +6016-660 7346 Email: mtmpre@yahoo.com Website: www.mtmpre.com.my We supply testing and measuring instruments for customers throughout Kuala Lumpur, Selangor, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
08 Oct 2026
