MF 28

picto fleche Electrical firing unit on pyrotechnical elements

The electrical firing unit MF 28 is a highly accurate current generator, programmable in amplitude and duration, specifically developed for use on pyrotechnical elements where user safety is at stake.

The MF 28 accurately controls non-fire current as well as time and energy of activation. It can be used for instrumented, performance and product line tests (with process automation) on pyrotechnical elements.

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The firing units MF 28 are highly accurate current generators, programmable in amplitude and duration, specifically developed for use on pyrotechnical elements where user safety is at stake.

The MF 28 accurately control non-fire current as well as time and energy of activation. They can be used for instrumented, performance and product line tests (with process automation) on pyrotechnical elements.

Several protections are integrated into the instrument in order to guarantee a safe use in any critical environment and more particularly for pyrotechnical systems:

External safety input (door closing, barrier closing, etc.)

Safety key extractible in "SAFETY" position

Protected "MANUAL" triggering button

Safety pyrotechnical ohmmeter at measurement current of < 10 mA, allowing continuity tests to be performed (to limit and control current, even in case of failure)

DC output line to prevent build-up of electrical charges

Further key elements in MF 28 design guarantee the accurate control of the ignition:

Absence of any overshoot

Rising time < 10 μs at 1 A

Any potential residual discharges, inopportune firing causes, are automatically removed by automatic short-circuiting of shot-firing cables.

Technical features:

  • Programmable current from 1 to 10 A
  • Programmable timing
  • Embedded line pyrotechnical ohmmeter
  • Isolated floating shot firing cable
  • 5 protection elements
  • Load breakdown detection
  • Manual or automated triggers
  • 3 synchronisation outputs (zero time, crenel current, current image)
  • Optional remote control of the cycle SAFE AUTHORIZATION OF FIRE

Yearly calibration is highly recommended in order to control the safety functions of your firing unit.

Technical support:

  • Our technical staff can support you:
  • Commissioning of your MF 28
  • Management of units evolution (number and functional needs)
  • On site breakdown servicing
  • Unit integration on test bench
  • On site investigation of any measurement issues

Programmable current

Range1 to 10 A in steps of 1 mA
Accuracy1% of the scale

Programmable timing

Range0.1 ms to 999 s in steps of:
10 µs from 0.01 ms up to 9.99 ms
100 µs from 10.0 ms to 99.9 ms
10 ms from 1.00 s to 9.99 s
100 ms from 10.0 s to 99.9 s
1 s from 100 s to 999 s
Accuracy± 25 µs for all ranges

Output voltage

Output voltage70 V in standard
15 to 120 V in option

Line ohmmeter

Range0 – 10 Ω in standard
0 – 20 Ω in option
Accuracy± 0.05 Ω (4 wire measurement)
± 0.1 Ω after line offset correction
Measuring current3.3 mA

Current copy output

Range0 – 10 V for each internal range
Accuracy± 5%
Rise time100 µs

Further features

Load breakdown detectionActivated: The line current is inhibited as soon as the igniter detects the first break
None: No current inhibition
SynchronisationsSynchro 1: Fire pulse (0 – 5 V)
Synchro 2: TTL presence copy line current (0 – 5 V)
Synchro 3: Key position copy (closed contact)
Fault detection- Line short-circuited: Rline < 0.5 Ω
- Line open: Rline >= 10,0 Ω
- Power supply fault: Rline * I > Power supply (120 V)
- Transistor fault: Output transistor continuously conducting
- Delay setpoint fault: The delay set point is not in the same range as the time setpoint
- Ohmmeter measurement current fault
- Power relay fault: ‘Power relay has not switched to the firing position’ or ‘Power relay has already switched to the idle position’
- Start already present before firing
External triggering BNCF+        Internal matching on 50 Ω (1/2 Ω)            Umax = 20 V
F-         Internal matching on 50 Ω (1/2 Ω)            Umax = 5 V
Fc        Return at +12 V on 1 KΩ            Umax = 20 V
Oc        Return at +12 V on 1 KΩ             Umax = 20 V
Trigger types- By protected manual internal pushbutton            Ma
- By external “Triggering” connector
- On Leading Edge                     F+
- On Trailing Edge                      F-
- On Closed Contact                  Fc
- On Open contact                     Oc

General specifications

SizeRack 19ʺ - 3U
1 / 2 channels: 360 mm depth
4 channels: 460 mm depth
Supply220 VAC – 50 / 60 Hz – 450 W
Communication portsRS 232 in option

Safety specifications

ProtectionsMains fuse x 2: 3.15 A del.

Instrument:

MF28 1V 5A 2W      MF 28 – 1 channel – 5 A – 2 wires

MF28 1V  5A 4W     MF 28 – 1 channel – 5 A – 4 wires

MF28 1V 10A 2W    MF 28 – 1 channel – 10 A – 2 wires

MF28-1V-10A-4W    MF 28 – 1 channel – 10 A – 4 wires

MF28-2V-5A-2W      MF 28 – 2 channels – 5 A – 2 wires

MF28-2V-5A-4W      MF 28 – 2 channels – 5 A – 4 wires

MF28-2V-10A-2W    MF 28 – 2 channels – 10 A – 2 wires

MF28-2V-10A-4W    MF 28 – 2 channels – 10 A – 4 wires

MF28-4V-10A-2W    MF 28 – 4 channels – 10 A – 2 wires

MF28light-1V-10A-2W     MF 28 light – 1 channel – 10 A – 2 wires

MF28light-2V-10A-2W     MF 28 light – 2 channels – 10 A – 2 wires

Further configurations on request: 4 channels, specific firing current…