| Indicator / Alarm unit Model | Number of mountable detectors ( an even number from 2 to 12)
Number of detectors mounted (from 1 to 12 )
A: Without a backup power source,
B: With a backup power source
NV-500- |
| Principle of detection | Catalytic combustion type |
| Gas to be detected | LPG leaked in the air ( i-C4H10 standard ) |
| Detection range | 0 to 100% LEL |
| Gas concentration indicator | LCD bar graph meter With back light ( with scales to read preset alarm value and peak hold) |
| Standard preset alarm value | 24% LEL ( iso-butane 0.43vol% ) The alarm point can be freely set using the. Keys. |
| Alarm accuracy | Within ?25% of the preset alarm value |
| Response time | Within 30 seconds when gas concentration is 1.6 times more than the preset alarm point ( Suction type: The delay due to sampling pipe length should be exempted.) |
| Alarm indication Individual alarm lamp Alarm sound | Red blinks In ease of an alarm. Self-holding. Lights up when buzzer stops. Intermittent alarm sound- Self-holding. Consecutive alarm method. |
| Failure indication Individual power lamp Alarm sound | Green lamp goes off and orange- lamp lights up when the sensor is disconnected. Intermittent alarm sound. Consecutive alarm method. |
Alarm output terminal
Individual contact
Individual output
Collective contact
Buzzer contact
External buzzer output
Centralized supervisory panel output | 1 a contact ( Contact capacity: AC100V 2A load resistance )
1 set each Voltage ( 0-6-12V 20mA or less ] 1 set each
1c contact ( Contact capacity: AC100V 2A load resistance )
1 set 1a contact ( Contact capacity: AC100V2A load resistance )
1 set
Voltage intermittent signal ( DC12V 10mA or less) 1 set
Voltage ( 0-6-12V 20mA or less ) 1 set |
| External reset terminal | Terminals for external buzzer stop and reset |
| Alarm delay | Delay mode can be set individually. ( Delay time:10 seconds in standard ) Setup at the time of delivery : Not set |
| Zero suppression function | Zero suppression mode can be set individually. Setup at the time of delivery : F.S.?5% |
| Auto zero adjustment function | Zero point can be automatically adjusted simply by pressing a button. |
| Power source | AC100-240V 50/60HZ ( standard ) DC24V?10% ( needs to be specified) |
| Power consumption | Diffusion type: ( 15+3.5_n ) VA n: number of detection point Suction type: The above + 4VA per point |
| Backup power source ( Unit with a backup power source only.) | Battery: | Gastight lead battery ( 12V2.6Ah_2 ) |
| Model ( Nos. of detector head ) | Diffusion type Suction type |
| NV-500-12 | 24 hours |
| NV-500-6 | 48 hours 15 hours |
| Charge time: | About 24 hours |
| (*1) Conditions; A cycle of intermittent operation is eleven minutes. No alarm. Voltage output with no load. |
| Temperature range | 0 to 400C |
| Installation | Wall-mounted or recessed |
| Painting color | Munsell 2.5 PB7.0/1.0 |
| External alarm barrier | Option : BT-150 intrinsically safe construction ( 2G4) |
| Maintenance function | Maintenance mode 1 | (Mainte lamp lights up, BATT voltage indicates " =1".) |
| Alarm lamp | Blinks for about five seconds when the preset alarm value is reached then lights up. |
| Alarm sound: | Intermittent sound. Automatically stops. |
| External output: | All contact output and voltage output stop. |
| Peak hold: | Peak hold is indicated when indication exceeds 10% LEL. |
| Zero suppression: | Canceled in the maintenance mode. |
| Auto span: | Peak hold value is automatically corrected to the calibration gas concentration value: simply by pressing a button. |
| Maintenance mode 2 ( MAINTE lamp lights up, BATT voltage indicates "=2".) |
| Auto zero and auto span functions are canceled. |
| Peak hold value of maintenance mode 1 is indicated. |
| Analog zero and span adjustments are carried out in this mode. |
Fixed Gas Detector
NV 400/500
