Questions and Answers
What is the typical current input range for an I/P transducer?
What is the primary function of an I/P transducer?
What is the primary role of the zero adjust knob on an I/P transducer?
What is the typical pressure output range for an I/P transducer?
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What is the purpose of the controller or DCS in relation to the I/P transducer?
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What is the function of the pneumatic actuator in relation to the I/P transducer?
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What is the purpose of the Honeywell model 870022 transducer?
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What is the relationship between the I/P transducer output and the pneumatic actuator?
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What is the function of the span adjust in a transducer?
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What is the purpose of the pilot valve in a transducer?
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What determines the air-handling capacity of a transducer?
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What should be done before removing a transducer in the field?
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What is the function of the force coil in a transducer?
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What is the difference between a direct-acting and reverse-acting transducer?
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What should be done to convert a transducer to reverse action?
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What is the minimum air capacity required for a two-stage transducer?
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The "span adjust" sets the span during calibration.
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The "force coil" produces a force proportional to the input current.
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The "feedback module" generates a force that opposes the force produced by the force coil.
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The I/P transducer converts a pressure signal to a current signal.
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The "pilot valve" supplies the pneumatic 3–15 psi output signal.
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The Honeywell model 870022 transducer is commonly used in the process industries.
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The "terminal block" is where field wires connect to the transducer.
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The zero adjust knob on an I/P transducer is used to calibrate the span of the transducer.
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A two-stage transducer has a lower air-handling capacity than a single-stage transducer.
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The I/P transducer output signal is typically sent to a pneumatic actuator.
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To convert a transducer to reverse action, you should reverse the output signal wires.
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The I/P transducer is typically used to convert a 4-20 mA signal to a 0-5 psi signal.
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The minimum air capacity required for a two-stage transducer is 50 cu.in. or more.
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The current signal sent to the I/P transducer originates from the controller or DCS.
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The I/P transducer converts the signal to a form suitable for the final control element.
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The I/P transducer is used to convert the signal received from the final control element to a current signal.
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What is the purpose of the I/P transducer in the process industries?
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What is the typical input range for an I/P transducer?
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What is the function of the zero adjust knob on an I/P transducer?
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What is the output of the I/P transducer typically sent to?
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What is the purpose of the controller or DCS in relation to the I/P transducer?
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What is the function of the pneumatic actuator in relation to the I/P transducer?
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What is the Honeywell model 870022 transducer commonly used in?
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What is the role of the I/P transducer in the control loop?
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What does the restrictor in a transducer do?
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What action is performed by the feedback module in a transducer?
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What is a characteristic of a two-stage transducer?
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Which of the following properly describes the operation of a single-acting transducer?
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What is required before safely removing a transducer in the field?
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How does a direct-acting transducer respond to an increasing input current signal?
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What should the air capacity of a two-stage transducer be for proper calibration?
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What does the pilot valve in a transducer provide?
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Study Notes
I/P Transducer
- Converts signal to required format for final control element and sends as output (e.g., 4-20 mA to 3-15 psi)
- Takes current input (usually 4-20 mA) and converts to pressure output (3-15 psi) in process industries
- Output typically goes to pneumatic actuator controlling a valve to move measured variable closer to set point
Honeywell Model 870022 Transducer
- Major parts:
- Zero adjust knob (sets transducer zero during calibration)
- Locknut (locks adjustment)
- Span adjust (sets span during calibration)
- Terminal block (connects field wires to transducer)
- Force coil (produces force proportional to input current)
- Feedback module (produces opposing force)
- Pilot valve (supplies pneumatic 3-15 psi output signal)
- Restrictor (reduces air flow through nozzle)
- Valve port (pneumatic output connection)
- Supply port (connects to air supply)
Operation
- Single-acting, force-balancing, final control interface element
- Air-handling capacity determined by pneumatic stages (single-stage or two-stage)
- Two-stage model can actuate pneumatic valve directly
- When calibrating, ensure two-stage model output is connected to capacity of 50 cu.in. or more
Direct and Reverse Acting Transducers
- Direct acting: increasing input current signal provides increasing output air signal
- Reverse acting: increasing input current signal provides decreasing output air signal
- To convert to reverse action, reverse input signal wires
Testing and Replacement of I/P Transducer
- Necessary steps:
- Obtain work permit and inform operations
- Safely isolate transducer
- Disconnect controller output signal
- Shut off instrument air supply
- Remove transducer
I/P Transducer
- Converts signal to required format for final control element and sends as output (e.g., 4-20 mA to 3-15 psi)
- Takes current input (usually 4-20 mA) and converts to pressure output (3-15 psi) in process industries
- Output typically goes to pneumatic actuator controlling a valve to move measured variable closer to set point
Honeywell Model 870022 Transducer
- Major parts:
- Zero adjust knob (sets transducer zero during calibration)
- Locknut (locks adjustment)
- Span adjust (sets span during calibration)
- Terminal block (connects field wires to transducer)
- Force coil (produces force proportional to input current)
- Feedback module (produces opposing force)
- Pilot valve (supplies pneumatic 3-15 psi output signal)
- Restrictor (reduces air flow through nozzle)
- Valve port (pneumatic output connection)
- Supply port (connects to air supply)
Operation
- Single-acting, force-balancing, final control interface element
- Air-handling capacity determined by pneumatic stages (single-stage or two-stage)
- Two-stage model can actuate pneumatic valve directly
- When calibrating, ensure two-stage model output is connected to capacity of 50 cu.in. or more
Direct and Reverse Acting Transducers
- Direct acting: increasing input current signal provides increasing output air signal
- Reverse acting: increasing input current signal provides decreasing output air signal
- To convert to reverse action, reverse input signal wires
Testing and Replacement of I/P Transducer
- Necessary steps:
- Obtain work permit and inform operations
- Safely isolate transducer
- Disconnect controller output signal
- Shut off instrument air supply
- Remove transducer
I/P Transducer
- Converts signal to required format for final control element and sends as output (e.g., 4-20 mA to 3-15 psi)
- Takes current input (usually 4-20 mA) and converts to pressure output (3-15 psi) in process industries
- Output typically goes to pneumatic actuator controlling a valve to move measured variable closer to set point
Honeywell Model 870022 Transducer
- Major parts:
- Zero adjust knob (sets transducer zero during calibration)
- Locknut (locks adjustment)
- Span adjust (sets span during calibration)
- Terminal block (connects field wires to transducer)
- Force coil (produces force proportional to input current)
- Feedback module (produces opposing force)
- Pilot valve (supplies pneumatic 3-15 psi output signal)
- Restrictor (reduces air flow through nozzle)
- Valve port (pneumatic output connection)
- Supply port (connects to air supply)
Operation
- Single-acting, force-balancing, final control interface element
- Air-handling capacity determined by pneumatic stages (single-stage or two-stage)
- Two-stage model can actuate pneumatic valve directly
- When calibrating, ensure two-stage model output is connected to capacity of 50 cu.in. or more
Direct and Reverse Acting Transducers
- Direct acting: increasing input current signal provides increasing output air signal
- Reverse acting: increasing input current signal provides decreasing output air signal
- To convert to reverse action, reverse input signal wires
Testing and Replacement of I/P Transducer
- Necessary steps:
- Obtain work permit and inform operations
- Safely isolate transducer
- Disconnect controller output signal
- Shut off instrument air supply
- Remove transducer
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Description
This quiz covers the principles, operation, testing, and repair of various components in instrumentation and control systems, including transducers, solenoids, actuators, and pressure elements. It also touches on troubleshooting, calibration, and replacement of these components.
