Question 1

What does a bar indicate exactly. On a 1000 litre tank, I know that 1 bar is 100 litre. But is that at least 100 l to 199 l or only 100 or less.

Accepted Answer

For safety's sake I take it as 100 or less. I would prefer not to run out for the sake of 100 litres of fuel. Alternatively use a stick to dip the tank and mark the stick as each bar comes up on the watchman. After a few marks you'll get a good idea as to the amount left.

Question 2

after installation,showed full up, though tank was only half full of oil. what is the [problem and solution?

Accepted Answer

I'd guess you may not have calibrated the sensor for the tank size / shape correctly. I recall there was a process to set this. Otherwise worth checking nothing (eg bit of plastic inside the tank) is between the sensor and the oil surface as I think it uses ultrasound waves like a radar to bounce off the surface of the oil to work out how full it is.

Question 3

How long does the battery last?

Accepted Answer

Like all batteries the life tends to vary. The installation instructions only state they have a very long service life …  but they will eventually need replacing. I got a new Watchman when I replaced my old tank over two years ago and it is still going with the same VARTA CR2430 Disc type battery. It is not difficult to replace but should not be attempted if the Watchman is still in the one year warranty period - if it appears to need replacing in this time then contact suppliers, as opening the battery unit will then invalidate the warranty.  Not something that you should be worried about if considering the purchase of a Watchman unit which has given me excellent service over the years.

Question 4

will the watchman sudden level drop alarm sound if someone removes the sensor from the tank

Accepted Answer

I don't know the answer but imagine it would just cease to work. I have a double skinned plastic tank which has the Watchman inside the outer skin accessible through a lockable lid. This keeps the sensor out of sight and locked away, although I don't think it would take too much to remove the lock by force. We do have a dog which is probably a better deterrent for a would be thief. Prospective owners should be aware that if the alarm does sound it is not likely to wake anyone up as it is not particularly loud (well, not for me anyway). Operation wise I have had no problems with this product over 22 years. but it is necessary to closely follow the instructions provided when fitting.

ASIN	B004MSBSSE
Batteries	1 CR2430 batteries required. (included)
Batteries Required?	Yes
Batteries included?	Yes
Battery Cell Type	Lithium Ion
Best Sellers Rank	13,305 in DIY & Tools ( See Top 100 in DIY & Tools ) 16 in Home Alarm Systems
Colour	Colour May Vary
Customer Reviews	4.3 4.3 out of 5 stars (243)
Date First Available	16 Sept. 2010
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Guaranteed software updates until	unknown
Included Components	Sonic Alarm
Item Package Quantity	1
Item Weight	350 g
Item model number	0
Manufacturer	Watchman
Part Number	WASONICALARM
Product Dimensions	50.8 x 15.24 x 15.24 cm; 350 g

Watchman Sonic Advanced Oil Tank Level Gauge, with Audible Alarm - Oil Tank Level Monitor and Tank Level Sensor

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