Macro Sensors LVDTs: PTI 750 Intrinsically Safe LVDT Position Transmitters

Description

THIS MODEL HAS BEEN DISCONTINUED.

The PTI 750 series of loop-powered LVDT position transmitters was specifically designed for use in hazardous locations. They have been certified by Factory Mutual (FM) as Intrinsically Safe (IS) when used with suitable barriers in Class I, II, and III, Division 1 and 2, Group A, B, C, D, E, F, G, and Type 4X locations, and as Non-Incendive (NI) in Class I, Division 2, Group A, B, C, and D locations. These 4-20 mA transmitters are offered in measuring ranges of 1 to 10 inches (25 to 250 mm) to provide reliable, contactless position monitoring and feedback for control valves and servo actuators used in all types of hazardous environments.

PTI 750 series transmitters are rugged and robust devices constructed entirely of TIG-welded stainless steel and hermetically sealed against hostile environments to IEC IP-68. The 2-wire loop input/output connections are made through a sealed axial connector and a NEMA-4 rated mating plug is supplied with each unit.

PTI 750 series transmitters used for Intrinsically Safe operation in hazardous locations must be installed in accordance with ANSI/ISA 12.6 using approved barriers that meet the IS Entity Parameters indicated below. The barrier's internal resistance must be added to the total loop resistance to determine the minimum loop voltage needed by the system, as shown graphically below. The two wires for operating the transmitter are run to a non-hazardous or "safe" area, where the Entity-compatible barrier, loop power supply, and loop load connections are located.

PTI 750 series position transmitters utilize built-in electronics to offer the frictionless operation, high resolution, excellent repeatability, and low hysteresis associated with LVDT technology, along with the convenience and simplicity of a precalibrated current loop output. They operate over a wide range of loop supply voltages and with loop resistances up to 800 Ohms, so they will work with a broad variety of servo controllers and PLCs, loop-powered analog or digital indicators, and computer-based data acquisition and processing systems. PTI 750 series transmitters have a maximum linearity error of ±0.5% of full range output using a statistically best-fit straight line derived by the least squares method.

PTI 750 LVDTs have an open bore at one end into which the core enters. Loop current will be 4 mA when the core is first inserted, increasing to 20 mA when the core is at full range within the transmitter's body. For position sensing requiring the opposite directional sense, PTI 750 transmitters are available with reversed output slope, which gives 20 mA when the core is first inserted, decreasing to 4 mA as the core moves inward. PTI 750 LVDTs are also available with metric-threaded cores and/or low friction Teflon™ bore liners as detailed below.


General Specifications Unit Specifications Mechanical Drawing & Wiring Diagram Entity Parameters Ordering Information Tech Bulletin	Description THIS MODEL HAS BEEN DISCONTINUED. The PTI 750 series of loop-powered LVDT position transmitters was specifically designed for use in hazardous locations. They have been certified by Factory Mutual (FM) as Intrinsically Safe (IS) when used with suitable barriers in Class I, II, and III, Division 1 and 2, Group A, B, C, D, E, F, G, and Type 4X locations, and as Non-Incendive (NI) in Class I, Division 2, Group A, B, C, and D locations. These 4-20 mA transmitters are offered in measuring ranges of 1 to 10 inches (25 to 250 mm) to provide reliable, contactless position monitoring and feedback for control valves and servo actuators used in all types of hazardous environments. PTI 750 series transmitters are rugged and robust devices constructed entirely of TIG-welded stainless steel and hermetically sealed against hostile environments to IEC IP-68. The 2-wire loop input/output connections are made through a sealed axial connector and a NEMA-4 rated mating plug is supplied with each unit. PTI 750 series transmitters used for Intrinsically Safe operation in hazardous locations must be installed in accordance with ANSI/ISA 12.6 using approved barriers that meet the IS Entity Parameters indicated below. The barrier's internal resistance must be added to the total loop resistance to determine the minimum loop voltage needed by the system, as shown graphically below. The two wires for operating the transmitter are run to a non-hazardous or "safe" area, where the Entity-compatible barrier, loop power supply, and loop load connections are located. PTI 750 series position transmitters utilize built-in electronics to offer the frictionless operation, high resolution, excellent repeatability, and low hysteresis associated with LVDT technology, along with the convenience and simplicity of a precalibrated current loop output. They operate over a wide range of loop supply voltages and with loop resistances up to 800 Ohms, so they will work with a broad variety of servo controllers and PLCs, loop-powered analog or digital indicators, and computer-based data acquisition and processing systems. PTI 750 series transmitters have a maximum linearity error of ±0.5% of full range output using a statistically best-fit straight line derived by the least squares method. PTI 750 LVDTs have an open bore at one end into which the core enters. Loop current will be 4 mA when the core is first inserted, increasing to 20 mA when the core is at full range within the transmitter's body. For position sensing requiring the opposite directional sense, PTI 750 transmitters are available with reversed output slope, which gives 20 mA when the core is first inserted, decreasing to 4 mA as the core moves inward. PTI 750 LVDTs are also available with metric-threaded cores and/or low friction Teflon™ bore liners as detailed below.	Features Intrinsically Safe (IS) Rated with Barriers for Class I, Div. 1, Group A, B, C, and D Hazlocs Non-Incendive (NI) for Class I, Div. 2 Hazlocs FM Entity Approval for Associated Apparatus Measurement Ranges of 1 inch to 10 inches Precalibrated 4-20 mA Loop-Powered Operation Non-Linearity less than ±0.5% of FRO Hermetically Sealed for Harsh Environments NEMA-4 Mating Connector Plug Supplied Applications Control Valve Position Indication Petro-chemical Plants Pumping Station Controls Refinery Operations Agri-chemical Dispensing