Delta Elektrogas LD, LDM Tightness Control Device

The LD/LDM tightness control device is designed to verify the absence of inadmissible leaks in gas trains composed by automatic shutoff valves. The check can be performed before the ignition of the gas burner or after its stop. This device is used in industrial firing processes and in forced draught burners, when power is higher than 1200 kW, according to EN 746-2 and EN 676.
Delta Elektrogas LDM


  • Microcontroller technology
  • Easy-to-see status of the device through high visibility LEDs
  • Easy accessible reset button
  • Adjustable test time to meet the plant needs
  • Adjustable test instant
  • Available Ex-proof version with metal enclosure for installation in Zone 2 and 22 (ATEX)
  • Available with integrated pressure switches and/or integrated auxiliary valves
  • Designed and manufactured according to EN 1643


230VAC 50/60Hz
110-120VAC 50/60Hz
24V DC
Voltage tolerance
-15% / +10%
Power absorption
10 VA (1W for 24V DC)
Integrated valves 2×21 VA
Ambient temperature
-15°C / +60°C
IP54 (LD)
IP65 (LDM)
Cable gland
PG9 for cable Ø6 / 8 mm
PG16 for cable Ø10 / 12 mm
ISO 4400 plug PG11 for cable Ø8 / 10 mm
Wires cross-section
2,5 mm2 max
5 A (slow-acting)
Output signals
5 A max. resistive
2 A max. inductive
Reset signal
applying mains voltage
Test period
10 s / 90 s adjustable
Filling/ Discharge time
3 s
Max. Working pressure
500 mbar (50 kPa)
Rp 1/4
Gas type
Non-aggressive gases included in the 1, 2 and 3 families (EN 437)
Integrated pressure switch
Comply with EN 1854
Integrated solenoid valves
Comply with a EN 161, class A
LD1 450 gr
LDM2 1200 gr
LD3 1600 gr
LDM4 2100 gr