Description
Introduction
The Schischek ExMax-8-BF1 combines explosion-proof technology with ultimate reliability for critical industrial applications. This ¼-stroke actuator delivers 8 Nm of torque, is suitable for a wide voltage range of 24…240 VAC/DC and features a fast spring return function of approximately 1 second per 90°. Bovendien is dit model uitgerust met twee geïntegreerde hulpschakelaars én een Ex-i tripping circuit voor directe koppeling met de Schischek ExPro-TT veiligheidstemperatuurbegrenzer.
This makes the ExMax-8-BF1 ideally suited for safety, control and shut-off applications in HVAC systems for chemical, pharmaceutical, industrial and offshore/onshore installations.
Key features
- Explosion-proof design certified to ATEX 2014/34/EU for gas and dust zones.
- 8 Nm torque with fast spring return of ~1 s/90° for maximum safety.
- Universal supply voltage 24…240 VAC/DC, self-adjusting.
- Equipped with 2 potential-free auxiliary switches (switching at 5° and 85°).
- Integrated Ex-i tripping circuit for direct connection of a safety temperature trigger.
- Compact and light: 210 × 95 × 80 mm, only 3.5 kg (aluminum housing).
- IP66 protection against dust and water jets.
- Adjustable run times: 3, 15, 30, 60 or 120 s/90° rotation.
- Rugged aluminum housing, optional stainless steel or seawater-resistant coating.
- Maintenance-free with integrated hand control.
Technical specifications
| Specification | Value |
|---|---|
| Motor torque (min.) | 8 Nm |
| Spring torque (F) | ~ 6 Nm |
| Supply voltage | 24…240 VAC/DC ±10 %, 50…60 Hz |
| Run times adjustable | 3 / 15 / 30 / 60 / 120 s/90° |
| Spring return | ~1 s/90° |
| Protection class | IP66 |
| Explosion classification | II 2 (2) G Ex db [ib Gb] IIC T6, T5 Gb / II 2 (2) D Ex tb [ib Db] IIIC T80°C, T95°C Db |
| Auxiliary switches | 2 × potential-free, 5° and 85° |
| Ex-i tripping circuit | For ExPro-TT safety temperature trigger |
| Shaft connection | Double square 12 × 12 mm |
| Dimensions (L×W×H) | 210 × 95 × 80 mm |
| Weight | ~ 3.5 kg (alu) |
Available variants
| Article name | Description | Article number |
|---|---|---|
| ExMax-8-F1 | Explosion-proof ¼-stroke actuator, 8 Nm, spring return ~1 s/90°, on-off | 173001 |
| ExMax-15-F1 | Explosion-proof ¼-stroke actuator, 15 Nm, spring return ~1 s/90°, on-off | 173002 |
| ExMax-8-SF1 | With 2 auxiliary switches | 173003 |
| ExMax-15-SF1 | With 2 auxiliary switches | 173004 |
| ExMax-8-BF1 | With 2 auxiliary switches + Ex-i trip circuit | 173005 |
| ExMax-15-BF1 | With 2 auxiliary switches + Ex-i trip circuit | 173006 |
Frequently Asked Questions (FAQ)
What makes the ExMax-8-BF1 unique?
In addition to the fast spring return of ~1 s/90° and explosion-proof construction, this model features auxiliary switches and an integrated Ex-i tripping circuit, allowing it to work directly with a safety temperature trigger.
What environments is the actuator suitable for?
The actuator is designed for use in ATEX zones 1, 2 (gas) and 21, 22 (dust), ideal for harsh industrial conditions.
How does spring return work?
Upon power failure or opening of line 3, the actuator automatically returns to the safety position in approximately 1 second per 90° rotation.
Is installation complicated?
On the contrary, compact construction, direct shaft connection and adjustable parameters make installation simple and flexible.
Can the actuator be used outdoors?
Yes, thanks to IP66 protection and optional stainless steel housing, the actuator is excellent for outdoor use, even in harsh weather conditions.
Available drives in the same series:
ExMax-S | without spring return | 5…30 Nm | suitable for use in Zone 1, 2, 21, 22
| Type | Torque | Spring return | Control |  Datasheet | Additional information | Certificate | Declaration of Conformity |
| ExMax-5.10 | 5/10 Nm | – | Open-close, 3-point |  | | | |
| ExMax-15.30 | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-S | 5/10 Nm | – | Open-close, 3-point | | | | |
| ExMax-15.30-S | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-Y | 5/10 Nm | – | 0-10VDC, 4-20 mA | | | | |
| ExMax-15.30-Y | 15/30 Nm | – | 0-10VDC, 4-20 mA | | | | |
| ExMax-5.10-R | 5/10 Nm | – | Open-close, 3-point | | | | |
| ExMax-15.30-R | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-CY | 5/10 Nm | – | 4-20 mA | | | | |
| ExMax-15.30-CY | 15/30 Nm | – | 4-20 mA | | | | |
ExMax-S | with spring return | 5…15 Nm | suitable for use in Zone 1, 2, 21, 22
| Type | Torque | Spring return | Control | Data sheet | Additional info | Certificate | Declaration of Conformity |
| ExMax-5.10-F | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-F | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-5.10-SF | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-SF | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-5.10-YF | 5/10 Nm | 3/10 sec / 90° | 0-10VDC, 4-20 mA | | | | |
| ExMax-15-YF | 15 Nm | 3/10 sec / 90° | 0-10VDC, 4-20 mA | | | | |
| ExMax-5.10-BF | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-BF | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-8-F1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-F1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-8-SF1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-SF1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-8-BF1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-BF1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-5.10-CYF | 5/10 Nm | 10 sec / 90° | 4-20 mA | | | | |
| ExMax-15-CYF | 15 Nm | 10 sec / 90° | 4-20 mA | | | | |
ExMax-S Accessories
| Type | Description | Data sheet | Additional info | Declaration of Conformity |
|---|---|---|---|---|
| ExSwitch | 2 external Ex auxiliary switches | | | |
| ExBox | Ex-e Terminal box | | | |
| ExBox-..-VA | Stainless steel housing | – | – | |
| ExPro-TT-.. | Safety temperature trigger for ExMax -…- BF actuators | | | |
| HV-.. | Manual operation | | – | – |
Do you have any questions or would you like more information? Please contact us! You can reach us by phone, email, or, if you prefer, via the chat function.
ExMax-8-BF1
Scope of delivery – ExMax (size S or M)
1 × drive with 1 m cable
1 × Allen wrench for manual lifting
4 × screws for mounting
Special models – ExMax -…- BF (size S or M)
Actuators for fire dampers (ExMax -…- BF) + safety temperature switch
ExPro-TT- …
Special models in stainless steel – ExMax -…- VAS / VAM (size S or M)
Corrosion-resistant housing material in stainless steel similar to AISI 316, some parts nickel-plated, screws in stainless steel
Use under extreme weather or harsh climatic conditions
Special models painted (coated) – ExMax -…- CTS / CTM (size S or M)
Aluminum housing with seawater-resistant offshore / marine coating, resistant to corrosive and marine atmosphere, some parts nickel-plated, screws in stainless steel
Suitable for offshore or onshore applications
Accessories / options – ExMax (size S or M)
- External customizable, on-site adjustable switches
- Mounting clamp for round valve pass (only for ExMax size S)
- Ex-e junction box
- Adjustments for butterfly or ball valves
- Mounting bracket
- Cable glands in nickel-plated brass
- Protective cover in stainless steel for mounting on ExMax actuators
- ExPolar heating system for use with ExMax drives under low temperatures down to -50°C