Festo SPAN-B Series - User Manual

The Festo SPAN-B pressure sensor converts pneumatic pressure values (relative pressure) into electrical signals for control or regulation. It utilizes a piezoresistive sensor element with a downstream electronic evaluation unit, connecting to a higher-level system via a switching output. This output can be configured to monitor a threshold value or a pressure range, with optional PNP or NPN and normally open (N/O) or normally closed (N/C) settings.

Function Description

The sensor operates in several modes:

RUN mode: The basic status after power-on, displaying the current measured value.
SHOW mode: Displays current settings and allows viewing of minimum and maximum measured pressures since switch-on or last reset.
EDIT mode: Used for setting or modifying parameters, including switching functions, device settings, and security codes.
TEACH mode: Facilitates the determination of switching points by accepting current pressure values as teaching points (TP1, TP2).

The SPAN-B offers two primary switching functions:

Threshold value comparator: Monitors a pressure threshold, configurable as normally open (N/O) or normally closed (N/C) with a hysteresis (HY). Switching points can be set via two teach points (TP1, TP2), where SP = 1/2 (TP1+TP2).
Window comparator: Monitors a pressure range, also configurable as N/O or N/C with hysteresis. Two switching points (SP.Lo, SP.Hi) are set via two teach points (TP1, TP2), where TP1 = SP.Lo and TP2 = SP.Hi.

Parameters such as filter time constant, unit for pressure indicator, zero point synchronization (zero adjust), economy mode period for display background lighting, and security code activation can be configured. The device also supports replication of parameters from a master sensor to a device sensor.

Important Technical Specifications

Operating Medium: Compressed air (ISO 8573-1:2010 [7:4:4]) and inert gases; operation with lubricated medium is possible.
Temperature Range:
- Medium: 0 to +50 °C
- Ambient: 0 to +50 °C
- Storage: -20 to +80 °C
Accuracy:
- ±1.5 % FS at room temperature
- ±3 % FS over complete temperature range
- Repetition accuracy: ±0.3 % FS (at [Filt] = [OFF])
- Temperature coefficient: typ. 0.1 % FS/K
Switching Output:
- Type: 1x PNP or 1x NPN, switchable
- Switching function: Threshold value comparator, window comparator
- Switch-on/switch-off time: Max. 1 ms
- Max. output current: 80 mA
- Capacitive load maximum DC: 100 nF
- Voltage drop: Max. 2 V
- Pull-down resistor: Integrated (PNP)
- Pull-up resistor: Not integrated (NPN)
- Inductive protective circuit: Present
- Short circuit current rating: Yes
- Overload protection: Present
Electronics:
- Operating voltage range DC: 10.8 to 30 V (nominal 12 to 24 V)
- No-load supply current: Max. 30 mA
- Ready-state delay: Typ. 30 ms
- Reverse polarity protection: All connections against each other
Mechanics:
- Housing material: PA-reinforced
- Inspection window material: PC
- Keypad material: TPE-O
- Materials in contact with the medium: FPM, NBR, PA-reinforced, brass (nickel-plated)
Display/Operation:
- Displayable units: bar, kPa, MPa, psi, mmHg, inchHg
- Setting range threshold values: 1 to 99 %FS
- Hysteresis setting range: 0 to 90 %FS
Degree of Protection: IP40 (in accordance with EN 60529)
Protection Class: III (in accordance with DIN VDE 0106-1)
Shock Resistance: 30 g acceleration with 11 ms duration (half-sine)
Vibration Resistance: 10 to 60 Hz: 0.35 mm / 60 to 150 Hz: 5 g
Pressure Measuring Range (SPAN-B-B2): -1 to 1 bar / -0.1 to 0.1 MPa
Overload Range (SPAN-B-B2): -1 to 5 bar / -0.1 to 0.5 MPa

Usage Features

Mounting: The sensor should be mounted to prevent condensation accumulation and avoid exceeding maximum operating temperature due to convection. Avoid applying force to the housing during assembly. Specific torque values are provided for different variants (e.g., SPAN-B-...-G18FPM: 1-2 Nm).
Electrical Connection: Use PELV circuits for power supply to ensure reliable electric disconnection. Maximum permissible line length is 30 m. The pin assignment is standard: Brown (+24V DC), Black (Switching output OutA), White (NC), Blue (0V).
Configuration via LCD Display and Pushbuttons: The device features a display and pushbuttons (A, B, EDIT) for navigating menus, viewing measured values, and setting parameters.
Security Code: A security code can be activated to block parameter entry in EDIT mode, enhancing security.
Zero Point Synchronization (Zero Adjust): Allows for offset correction of the measured value indicator and switching points. This function can be performed by holding down A and B pushbuttons and then pressing the EDIT key.
Replication of Parameters: Simplifies configuration of multiple sensors by copying settings from a master sensor to device sensors.
TEACH Mode: Simplifies setting switching points by using current pressure values. Note that there is no time-out in TEACH mode; the sensor remains in this mode until the process is completed.

Maintenance Features

Restoring Factory Settings: The sensor can be reset to factory settings by a specific button sequence (switch off, hold A and B, switch on, press EDIT). This will erase all current settings.
Cleaning: Clean the sensor with non-abrasive cleaning agents.
Troubleshooting: The manual provides a comprehensive fault clearance table, addressing issues like no display, incorrect switching output reaction, and error messages (e.g., [Er01]/[FAIL], [Err10]/[OVER], [Err21]/[SHRt], [Err]/[BUSY], [Err]/[ID], [Err]/[COMM]). Remedies include checking operating voltage, replacing the device, eliminating short circuits, repeating teach-in, and checking wiring.
Disassembly: Involves switching off energy sources, disconnecting pneumatic and electrical connections, loosening mountings, and removing the device.
Disposal: Packaging and product should be recycled in an environmentally sound manner according to current regulations.