


A2109 Intrinsically Safe Tachometer Combination Contact and Non-Contact Digital Tachometer
Model A2109/LSR for measurement only
Model A2109/LSR/002 for measurement and pulse output facility
The A2109/LSR explosion-proof, intrinsically-safe tachometer is certified EEx ia IIC T4 - ATEX II 2 G to allow for use in a wide range of hazardous environments including petrochemical, gas & volatile materials processing industries.
The A2109/LSR is not certified for use in Mines.
The A2109/LSR combines the best features of both contact and non-contact models to accurately measure RPM, surface speed and length.
Contact measurements
With A2100/01 Adaptor fitted (supplied) rpm, rps, Metres, Feet, Yards per min or per second or total revolutions or length.
Signal Output features - A2109/LSR/002
Pulse Output facility - 5v Pulse output. Output via socket on rear of housing, supplied with 2 metre BNC output cable.
- Pulse output facility
- Tripod bush
- Signal output cable - 2 metres free ends
- Remote on/off via cable
The Pulse output facility The Pulse output models also have a camera tripod bush fitted as standard, this feature is ideal for hands free applications, for example, continuous monitoring speed of machines, test rig providing easy to set up speed check & recording facilities.
Warning
The pulse output must only be connected through approved equipment.
Also known as SKF TMRT 1Ex
- Explosion-Proof Housing
- Vertical display with 180° inversion capability
- Includes factory calibration certificate
- Includes combination surface speed wheel & cone tip attachment
- Includes slide-in contact adapter
- Memory holds last reading for 1 minute
Complete Kit
Combination Contact Adapter/Surface speed & length Adapter Included.

Specifications
| Measuring Range | 3.0 - 99,999 rpm
0.3 - 1,500.0 Meters or Yards/min (4,500 ft/min) or seconds |
|---|---|
| Resolution | .001 rpm |
| Accuracy | 0.02% of reading ± 1-digit |
| Laser Type | 635nm with power less that 1mW (class II) |
| Optical Sensing Range | 2 - 80" / 50 - 2000mm |
| Update Time | 0.8 sec |
| Capture Mode | 0.1 Sec |
| Count | 0-99999 revs or length in linear |
| Time Interval | 0-99999 seconds (auto) |
| Memory Hold | Holds last reading for 1 minute |
| On Target Indicator | Yes |
| Housing Material | High Flow ABS - Metalised |
| Batteries | 4x AAA (included) |
| Dimensions | 21 L x 4 W x 3.5 D - cm |
| Measuring Wheel / Cone Tip | Included, 0.1 meter circumference wheel and cone tip (combination attachment) |
| Weight (kit) | 0.4 Kg |
| Warranty | 1 year |
| Sensing Distance | 1 meter (39 inches) |
| Battery Life | 6 hours continuous (shorter when using rechargeable type |
| Display Update Rate | 0.8 seconds/update (0.1 sec for Max Value capture) |
| Alternate Model Number | ET-2109LSR |
Shipping
| Carriers | UPS or FedEx for domestic orders; FedEx for international orders |
|---|---|
| Shipping cost | Calculated automatically at checkout for US orders. International orders require a complete ship-to address with postal code. |
| Freight terms | FOB shipping point, freight prepaid. Title passes to the buyer at the vendor's dock. |
| Hazardous items | Epoxy adhesives, batteries and paint markers cannot ship by air freight |
| International | Shipping fees do not include taxes, tariffs or duties |
Returns
| Return window | 7 calendar days from delivery. Contact us before returning any item. |
|---|---|
| Condition | New, unaltered and unused. Special and custom orders are not returnable. |
| Restocking fee | 15% on non-defective items that are not being exchanged |
| Full policy | Refund / Return Policy |
See our Shipping & Billing Terms for how estimated shipping is charged, and our Refund / Return Policy.
Questions about shipping on this item? Call (214) 238-0493 or contact us.
