Description
Overview
The Type 950XP Explosion-Proof I/P Transducer converts a 4-20 mA electrical current signal into a directly proportional pneumatic output pressure. Its closed-loop pressure feedback system continuously measures the output and automatically corrects deviations to provide highly accurate, stable pressure control for actuated valves and other pneumatic final control elements.
An integral volume booster provides flow capacity up to 12 scfm, supporting fast response in critical applications and sufficient output to operate larger valves and actuators. The compact unit is position-insensitive, vibration-resistant, and designed with accessible pneumatic ports and external zero and span adjustments for straightforward installation and calibration.
The Type 950XP is housed in a NEMA 4X/IP65 explosion-proof enclosure and is available with FM, CSA, and ATEX hazardous-area approvals. When ordered with the natural gas option, the transducer is suitable for sweet natural gas or methane service and includes a tapped exhaust and factory-sealed conduit assembly.
Key Features
- Converts a 4-20 mA input into proportional pneumatic pressure
- Closed-loop electronic pressure feedback
- Accuracy, hysteresis, and repeatability of ±0.10% of span
- Integral volume booster with flow capacity up to 12 scfm
- Low air consumption of 3.0 scfh at midrange
- Explosion-proof NEMA 4X/IP65 enclosure
- Available for intrinsically safe and explosion-proof applications
- Approved for sweet natural gas or methane with the E option
- Position-insensitive mounting
- High resistance to shock and vibration
- RFI/EMI protection
- Direct, reverse, and split-range operating modes
- Optional field-selectable output ranges
- External zero and span adjustments
- Optional 1/8″ NPT tapped exhaust
- Direct wall, panel, valve, or optional pipe mounting
Performance Characteristics
- Input Signal: 4-20 mA
- Output Pressure Ranges: 3-15 psig, 3-27 psig, 6-30 psig, and 0-33 psig
- Maximum Supply Pressure: 100 psig for 3-15, 3-27, and 6-30 psig models
- Maximum Supply Pressure for 0-33 psig Model: 70 psig
- Minimum Supply Pressure: 5 psig above maximum output pressure
- Flow Capacity: 4.5 scfm at 25 psig supply and 12 scfm at 100 psig supply
- Air Consumption: 3.0 scfh (1.5 Nl/min) at midrange
- Natural Gas Flow and Consumption Correction: Multiply air values by 1.29
- Operating Temperature: -40°F to 158°F (-40°C to 70°C)
- Storage Temperature: -40°F to 200°F (-40°C to 93°C)
- Loop Load: 9.5 VDC at 20 mA
- Accuracy, Hysteresis, and Repeatability: ±0.10% of span
- Field-Selectable Option Accuracy: ±0.25% of span
- Deadband: 0.02% of span
- Position Effect: No measurable effect
- Supply Pressure Effect: No measurable effect
- Vibration Effect: Less than ±1.0% of span under specified test conditions
- Temperature Effect: ±0.045% per °F (0.07% per °C) of span
- Reverse Polarity Protection: No damage from reversed 4-20 mA current or input up to 60 mA
- RFI/EMI Effect: Less than 0.5% of span change in output pressure
- Pneumatic Ports: 1/4″ NPT inlet and outlet ports
- Electrical Connection: 1/2″ NPT or M20 x 1.5 with ATEX option
- Operating Media: Clean, dry, oil-free air filtered to 40 microns
- Optional Media: Sweet natural gas or methane with the E option
- Standard Weight: 1.8 lbs (0.82 kg)
- Weight with Natural Gas Option: 2.3 lbs (1.1 kg)
The Type 950XP uses a piezoelectric actuator, pilot nozzle, pressure sensor, and integral volume booster to deliver self-correcting pneumatic output. This closed-loop design minimizes changes caused by vibration, mounting orientation, temperature, and supply pressure.
How to Select the Right Configuration
Selecting the correct Type 950XP configuration depends on the required output range, operating mode, process media, hazardous-area approval, exhaust requirements, mounting method, and supply pressure.
- Select the 3-15 psig range for standard valve actuator and positioner applications.
- Select the 3-27 psig or 6-30 psig range when a wider or higher pneumatic signal is required.
- Select the 0-33 psig range for zero-based pressure control.
- Choose the field-selectable option when one unit must support 3-15, 3-27, or 6-30 psig output.
- Choose direct acting when increasing input current should increase output pressure.
- Choose reverse acting when increasing input current should decrease output pressure.
- Use split ranging when one 4-20 mA signal must operate multiple control devices over separate input segments.
- Select the E option for approved sweet natural gas or methane service.
- Select the T option when exhaust air or gas must be captured through a 1/8″ NPT connection.
- Select the K option when ATEX approval is required.
- Verify that supply pressure is at least 5 psig above the maximum required output.
- Add the optional pipe-mounting kit for installation on 1.5″ or 2″ pipe.
- Avoid extended electrical input without supply pressure, as this may damage the unit.
For additional guidance:
Applications
The Type 950XP is designed for hazardous industrial applications requiring accurate, rugged, and high-flow current-to-pressure conversion.
- Pneumatic valve actuators
- Control valves and valve positioners
- Natural gas instrumentation systems
- Oil and gas production equipment
- Pipeline control systems
- Refinery and petrochemical processes
- Chemical processing equipment
- Hazardous-area automation
- High-vibration machinery
- Remote pneumatic control systems
- Emergency shutdown and safety systems
- OEM process-control equipment
Explore more applications:
Models & Configurations
Type 950XP Ordering Structure
950 – A [Output] [Options]
Input Signal
- A = 4-20 mA
Output Pressure Ranges
- C = 3-15 psig (0.2-1.0 bar)
- D = 3-27 psig (0.2-1.8 bar)
- E = 6-30 psig (0.4-2.0 bar)
- F = 0-33 psig (0-2.2 bar)
Available Options
- A = Field-Selectable Outputs for 3-15, 3-27, and 6-30 psig models; ±0.25% accuracy
- E = Natural Gas Approval; includes tapped exhaust and factory-sealed conduit assembly
- K = ATEX Explosion-Proof and Intrinsically Safe Approval; not available with output F
- T = 1/8″ NPT Tapped Exhaust
Accessory
- 1.5″ or 2″ Pipe Mounting Kit: P/N 448-542-005
Technical Resources
- Product Data Sheet
- Installation Instructions
- Product Configurator
- 3D CAD Models
- Certifications
- Engineering Support Resources
FAQs
What does the Type 950XP explosion-proof I/P transducer do?
The Type 950XP converts a 4-20 mA electrical current signal into a proportional pneumatic pressure for actuated valves and other pneumatic control devices.
How accurate is the Type 950XP?
Accuracy, hysteresis, and repeatability are rated at ±0.10% of span. Models with the field-selectable output option are rated at ±0.25% of span.
What output pressure ranges are available?
The Type 950XP is available with 3-15 psig, 3-27 psig, 6-30 psig, and 0-33 psig output ranges.
Can the Type 950XP be used with natural gas?
Yes. When ordered with the E option, the Type 950XP is approved for sweet natural gas or methane and includes a tapped exhaust and factory-sealed conduit assembly.
What is the maximum flow capacity?
The Type 950XP provides up to 12 scfm (340 Nl/min) at 100 psig supply pressure.
What operating modes are available?
The Type 950XP supports direct, reverse, and split-range operation. Split ranging is not available with the field-selectable output option.
Is the Type 950XP position-sensitive?
No. The transducer has no measurable position effect and can be mounted in any orientation.
What hazardous-area approvals are available?
Standard configurations are available with FM and CSA explosion-proof and intrinsically safe approvals. ATEX approval is available with the K option.
Can the exhaust be captured?
Yes. The T option provides a 1/8″ NPT tapped exhaust. The natural gas E option also includes a tapped exhaust.
What air quality is required?
The Type 950XP requires clean, dry, oil-free air filtered to 40 microns.
