Process Annunciators & Scanners

Process
Process meters are high precision instruments designed to measure, display, alarm, and control a wide range of process variables, such as 4-20 mA and 0-10 V analog inputs. Precision Digital’s process meters are available with relays, analog and open collector outputs, 24 V transmitter power supply, programmable function keys and advanced signal input conditioning, all of which greatly increase their functionality and utility. Many of these meters include sunlight-readable, dual-line LED displays, wide angle viewing, increased power efficiency, and digital serial communications. Process meters are available in NEMA 4X front digital panel meters as well as FM, CSA, ATEX, and IECEx approved explosion-proof and intrinsically safe meters for hazardous areas.

Process Annunciators & Scanners

  • The MINIMUX® II PD138 is a microprocessor-based, eight-channel analog input scanner/multiplexer and annunciator that provides low-cost automatic switching for multi-point display and alarm systems. It can automatically switch up to eight inputs to another device such as a digital panel meter, controller, or PLC. Signal switching is done via reed relays making the PD138 ideal for switching thermocouples, RTDs, control loops, and AC/DC signals. They feature rugged NEMA 4X/IP65 fronts and a wide operating temperature range. They can be programmed for many common ISA alarm sequences including first out indication and they provide alarm signaling through front panel LEDs and a build in 85 dB horn. Custom printed message labels can be included with your order at no additional charge.

    Why you should buy:
    • Scans Temperature and Analog Inputs
    • Channel Alarms
    • NEMA 4X/IP65 Front
  • The PDS178 Watchdog Temperature Scanning & Alarming System brings together a popular combination of Precision Digital products: the Trident meter, the Minimux II scanner, and the PDA2821 NEMA 4X enclosure. The scanner automatically switches between up to eight (8) input signals (4-20 ma, ±10 V, TC, or RTD) and sends them to the Trident meter for display. Signal switching is done via DPST reed relays. The Watchdog can be used in a variety of temperature and process monitoring applications. A very common application for this system is to monitor bearing temperatures. The Trident meter included with this system is available with standard 0.56" (14.2 mm) high LED digits or large 1.2" (30.5 mm) high LEDs.