ROM is a remote ohmmeter for safe and convenient measurement of the blasting line resistance.
ROM consists of two blocks:
Ohmmeter with radio transmitter
Receiver and alarm unit
The ohmmeter with transmitter is connected to the blasting line. Ohmmeter measures the line resistance, shows the value on backlit LCD display and transmits resistance value wirelessly to the receiver. Ohmmeter unit can be used separately as digital line tester without the receiver.
Receiver shows the line resistance on its LCD display in real time. If the resistance of the blasting line changes by more than +/- 3 ohms, both a visual and an audio alarm will activate and work can be stopped immediately to check the line.
For safety reasons, the measuring current is limited to 1mA.
Features and Benefits
Large LCD display with a backlight
Wireless connection between ohmmeter and receiver
Resistance measuring range
0 – 999 and 1000 – 1999 ,
automatic range selection
0.1 Ω for 0 – 999 Ω range
1 Ω for 1000 – 1999 Ω range
±0.5% or ±0.1 Ω, whichever is higher
Line testing current (max)
Ohmmeter: 3 x 1.5V AA batteries
Receiver: 3 x 1.5V AA batteries
Ohmmeter: 100 hours
Receiver: 100 hours
–20 to +50
Ohmmeter: 0.34 (with batteries)
Receiver: 0.34 (with batteries)
Ohmmeter: 170 x 88 x 33
Receiver: 145 x 88 x 33