Compared to the ZSE20, the ZSE20AF adds a 2nd switch output, as well as an analog output, either voltage or current.  ZSE20A is vacuum rated, while the ZSE20AF is rated for vacuum and a low positive pressure range.  Each model in the ZSE20 family offers a 2-screen, 3-color display.  The main screen shows the current measured numeric value in orange. 

Magnet: None, Series: A2 (Standard), Mounting: B (Basic), Tube Material: Aluminum, Bore Size: 80mm, Port Thread: Rc, Stroke: 600mm, Rod Boot: None, Cushion: Air Cushion, Pivot Bracket: None, Rod End Bracket: V (Single Knuckle Joint)

Magnet: None, Series: A2 (Standard), Mounting: B (Basic), Tube Material: Aluminum, Bore Size: 63mm, Port Thread: Rc, Stroke: 75mm, Rod Boot: None, Cushion: Air Cushion, Pivot Bracket: None, Rod End Bracket: V (Single Knuckle Joint)

Magnet: None, Series: A2 (Standard), Mounting: B (Basic), Tube Material: Aluminum, Bore Size: 80mm, Port Thread: Rc, Stroke: 150mm, Rod Boot: None, Cushion: Air Cushion, Pivot Bracket: None, Rod End Bracket: V (Single Knuckle Joint)

Flow Rate Range: 10 [0.2 to 10 (5 for CO2) â„“/min], Flow Adjustment Valve: None, Port Size: N01 (NPT1/8), Piping Entry Direction: Straight, Output Specification: 1 [Analog Output (1 to 5 V)], Instruction Manual: With Instruction Manual, Calibration Certificate: A (w/Calibration Certificate), Connector: W [Lead Wire w/Connector (2m) + Rubber Cover]

Flow Rate Range: 25 [0.5 to 25 (12.5 for CO2) â„“/min], Flow Adjustment Valve: None, Port Size: N01 (NPT1/8), Piping Entry Direction: Straight, Output Specification: 1 [Analog Output (1 to 5 V)], Instruction Manual: With Instruction Manual, Calibration Certificate: A (w/Calibration Certificate), Connector: W [Lead Wire w/Connector (2m) + Rubber Cover]

Flow Rate Range: 50 [1 to 50 (25 for CO2) â„“/min], Flow Adjustment Valve: None, Port Size: N01 (NPT1/8), Piping Entry Direction: Straight, Output Specification: 1 [Analog Output (1 to 5 V)], Instruction Manual: With Instruction Manual, Calibration Certificate: A (w/Calibration Certificate), Connector: W [Lead Wire w/Connector (2m) + Rubber Cover]

Thread: N (NPT), Seal: None, Options: P (Scale Plate Pressure Unit: Both MPa and psi)

Size: 3, Standard Dew Point: -20°C, Type: Standard, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None (Standard), Option: P (Fitting for Purge Air Exhaust)

Size: 5, Standard Dew Point: -20°C, Type: Standard, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None (Standard), Option: P (Fitting for Purge Air Exhaust)

Size: 3, Standard Dew Point: H (-15°C), Type: Standard, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None (Standard), Option: P (Fitting for Purge Air Exhaust)

Thread: NPT, Seal: None, Options: Scale Plate Pressure Unit: Both MPa and psi

Output Specification: PNP Open Collector 1 Output, Unit Specification: w/Unit Selection Function, Piping Specification: NPT 1/8, Option 1: -, Option 2: -, Option 3: -

Rated Vacuum Range: -100 to 100 kPa, Output Specification: PNP Open Collector 1 Output, Unit Specification: w/Unit Selection Function, Piping Specification: NPT 1/8, Option 1: -, Option 2: -, Option 3: -

Rated Vacuum Range: -101 to 0 kPa, Output Specification: PNP Open Collector 1 Output, Unit Specification: w/Unit Selection Function, Piping Specification: NPT 1/8, Option 1: -, Option 2: -, Option 3: -

Size: 3, Standard Dew Point: -20°C, Type: Standard, Thread: NPT, Port Size: 1/8, Accessory: None (Standard), Option: Fitting for Purge Air Exhaust

Size: 5, Standard Dew Point: -20°C, Type: Standard, Thread: NPT, Port Size: 1/8, Accessory: None (Standard), Option: Fitting for Purge Air Exhaust

Size: 3, Standard Dew Point: -15°C, Type: Standard, Thread: NPT, Port Size: 1/8, Accessory: None (Standard), Option: Fitting for Purge Air Exhaust

Model: 0 to -101kPa, Piping: NPT 1/8, M5 Female, Output: PNP Open Collector 1 Output, Display Unit: -, Lead Wire: -, Bracket/Panel Mount Adapter: -, Operating Manual/Certificate: -, Made to Order: -

Model: -100 to 100kPa, Piping: NPT 1/8, M5 Female, Output: PNP Open Collector 1 Output, Display Unit: -, Lead Wire: -, Bracket/Panel Mount Adapter: -, Operating Manual/Certificate: -, Made to Order: -