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Model PT750 Series Annunciator / Repeater

Fiberglass & Stainless Steel Enclosures

Model PT750 Annunciator collects sensor data from the main control monitor. Communication is RS485 half duplex between the annunciator and the control panel using a single pair twisted data cable. Maximum length of the cable is 4000 feet. For noisy environment an optional Fiber Optics data converter is used to transmit and receive data over fiber optics cable.

An optional alarm relay module can provide 4 form “C” type relay contacts. The relays are activated whenever the main control panel is in alarm.

Each channel can be programmed to have a sensor tag identifying the location of the sensor. The color graphic touch screen provides easy unit configuration and setup.

View Data Sheet


Power Input

120/220 VAC 
1.5 Amps @ 24VDC


4” Color Touch screen for data display and unit configuration

Optional Discrete Alarm Relays

3 Levels of alarm (Low, High & High-High)
1 Sensor Fault
SPDT Form "C" type Relay contacts
2Amps @ 250 VAC or 30 VDC

Optional Wireless Module

RS-485 Wireless Bridge to create wireless link to the main control panel
ISM: 900 MHz or 2.4 GHz (worldwide)
Line of sight: 2Km

Operating Temperature

-20 °C to +50 °C

Serial Port Peripherals & Interface

RS-485 MODBUS RTU Compatible with PLC’s, SCADA and DCS systems. MODBUS registers defined in the control Module: Gas concentration, current alarm levels and alarm status, sensor calibration mode, Remote alarm Reset and Bypass


Purge kit for pressurized enclosure to be used in hazardous locations (Stainless Steel Enclosures only)

Other Options

Fiber Optics data converter for communication using fiber optics cable for noisy environment

Approved Enclosure Options

  • Nema 4X, Fiberglass, IP 66 Wallmount
  • Nema 4X, Stainless Steel, IP66 Wallmount
  • Nema 7, Explosion Proof Wallmount, CSA, UL