Calibration is a set of actions, which are carried out under prescribed environmental conditions, to establish a correlation between the value measured by a measuring instrument, the existing value of material measure or reference material and the value which have been reproduced according to the standard of the unit of measure concerned.
The Regulations No.693 of the Cabinet of Ministers of the Republic of Latvia state requirements for calibration of measuring instruments, as well as the list of measuring instruments for calibration and calibration periodicity in Latvia.
In the mandatory scope laboratory is accredited to perform calibration of:
- metal capacity measures for alcohol and petroleum products,
- storage tanks for alcohol and petroleum products,
- consumption meters, which are not built-in tanks or measuring systems, for alcohol and petroleum products,
- automatic level gauges for measuring the level of liquid in stationary storage tanks,
- pressure gauges installed in the pressure equipment and manufactured in accordance with the normative acts on pressure equipment, except pressure gauges which are subject to verification in accordance with the normative acts on the State metrological control of measuring instruments subject list,
- multimeters (voltmeters, ammeters, wattmeters),
- current clamps,
- ohmeters, megohmmeters, earth resistance meters,
- thermometers for measuring temperature of alcohol and petroleum products,
- explosive gas concentrations detectors.
V&V VentMet laboratory Ltd. performs calibration of the following measuring instruments in the accredited scope, by ensuring the traceability of measurements to the national and international standards:
| Measured quantity / Measuring instrument | Measuring range | Calibration and measurement capability expressed as an expanded uncertainty at k=2(±) |
|---|---|---|
| Mass / Weights | 1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg 200 mg 500 mg 1 g 2 g 5 g 10 g 20 g 50 g 100 g 200 g 500 g 1 kg 2 kg 5 kg 10 kg 20 kg 500 kg |
0.010 mg 0.013 mg 0.013 mg 0.013 mg 0.013 mg 0.014 mg 0.016 mg 0.016 mg 0.020 mg 0.021 mg 0.025 mg 0.046 mg 0.048 mg 0.050 mg 0.11 mg 0.19 mg 0.58 mg 5.2 mg 5.8 mg 7.3 mg 14 mg 27 mg 54 mg 12 g |
| Mass / Non-automatic weighing instruments | 1 g ÷ 1111 g 1111 g ÷ 30 kg 30 kg ÷ 80 kg 80 kg ÷ 5030 kg 5030 kg ÷ 60 000 kg |
0.0031 mg ÷ 1.0 mg 2.2 mg ÷ 64 mg 74 mg ÷ 0.38 g 0.40 g ÷ 76 g 0.091 kg ÷ 2.0 kg |
| Volume / Piston-operated volumetric apparatus – piston pipettes, piston burettes, dilutors, dispensers | 10 µl ÷ 50 µl 50 µl ÷ 1000 µl 1000 µl ÷ 17000 µl |
0.027 µl 0.050 µl 0.41 µl |
| Volume / Capacity measures (gravimetric method) |
1ml ÷ 5 ml 5 ml ÷ 10 ml 10 ml ÷ 25 ml 25 ml ÷ 100 ml 100 ml ÷ 200 ml 200 ml ÷ 500 ml 500 ml ÷ 1000 ml 1 l ÷ 10 l 10 l ÷ 20 l 20 l ÷ 50 l 50 l ÷ 200 l 200 l ÷ 500 l 500 l ÷ 1000 l 1000 l ÷ 2500 l 2500 l ÷ 50000 l |
0.000021 ml 0.000046 ml 0.000048 ml 0.000096 ml 0.00019 ml 0.00058 ml 0.0052 ml 0.0058 ml 0.027 ml 0.055 ml 0.21 ml 0.83 ml 2.1 ml 4.2 ml 10.4 ml |
| Volume / Capacity measures (volumetric method) |
1 l ÷ 10 l 10 l ÷ 20 l 20 l ÷ 50 l 50 l ÷ 200 l 200 l ÷ 500 l 500 l ÷ 1000 l 1000 l ÷ 2500 l 2500 l ÷ 50000 l |
0.20 ml 0.69 ml 2.5 ml 4.9 ml 20 ml 49 ml 99 ml 250 ml |
| Volume / Liquid storage tanks (geometric method) horizontal tanks vertical tanks |
1 m3 ÷ 200 m3 1 m3 ÷ 60 000 m3 |
0.031% 0.0041% |
| Volume / Liquid storage tanks (volumetric method) horizontal tanks vertical tanks |
1 m3 ÷ 60 000 m3 | 0.22% |
| Volume / Pipelines | Dn (6 ÷ 2000) mm ≥ 0.001 m3 |
0.004% |
| Volume / Fuel dispensers (at flow 2 l/min ÷ 200 l/min) Liquefied petroleum gas dispensers (at flow 5 l/min ÷ 75 l/min) |
2 l ÷ 50 l 5 l ÷ 50 l |
0.14% 0.74% |
| Volume / Consumption meters for various liquid products, flow meters | 0.1 l ÷ 50 l (at 1 l/h ÷ 3000 l/h) 50 l ÷ 1000 l (at 3 m3/h ÷ 60 m3/h) 1000 l ÷ 5000 l (at 60 m3/h ÷ 300 m3/h) |
0.058% 0.031% 0.14% |
| Volume / Gas meters (diaphragm) G1.6 ÷ G25 |
1 l÷ 500 l (at 0.016 m3/h ÷ 10 m3/h) 100 l ÷ 500 l (at 10 m3/h ÷ 40 m3/h) |
0.09% 0.15% |
| Volume / Gas meters (rotary displacement and turbine) G16 ÷ G4000 |
0.5 m3/h ÷ 6500 m3/h | 0.26% |
| Volume / Gas volume conversion devices | – | 0.12% |
| Volume / Water meters | 1 l ÷ 150 l (at 0.01 m3/h ÷ 20.00 m3/h) | 0.20% |
| Thermal energy / Heat meter | 0.0001 MWh ÷ 1.0 MWh (at 0.01 m3/h ÷ 20.00 m3/h) | 0.36% |
| Length, temperature / Automatic liquid level and temperature measuring system length temperature mass calculation error volume calculation error |
0 ÷ 30 m -20 °C ÷ +85 °C – – |
1.3 mm 0.12 °C 0.071 % 0.038 % |
| Length / Micrometers | 0 ÷ 100 mm, resolut. 0.001mm 0 ÷ 100 mm, resolut. 0.01mm |
0.57 µm + 0.80·L µm, where L is in meters 5.7 µm + 0.80·L µm, where L is in meters |
| Length / Dial indicators | 0 ÷ 100 mm, resolut. 0.0001 mm 0 ÷ 100 mm, resolut. 0.001 mm 0 ÷ 100 mm, resolut. 0.01 mm |
0.13 µm + 0.10·L µm, where L is in meters 0.26 µm + 0.10·L µm, where L is in meters 2.3 µm + 0.10·L µm, where L is in meters |
| Length / Micrometer standards, gauge blocks | 0 ÷ 977 mm | 1.2 µm |
| Length / Internal micrometers | 0 ÷ 977 mm | 1.2 µm |
| Length / Geometrical objects (length, width, height, diameter) | 0 ÷ 977 mm | 0.00082 mm ÷ 0.0072 mm |
| Length / Slide gauges | 0 ÷ 900 mm, resolut. 0.01 mm 0 ÷ 900 mm, resolut. 0.02 mm 0 ÷ 900 mm, resolut. 0.05 mm 0 ÷ 900 mm, resolut. 0.1 mm |
5.7 µm + 0.80·L µm, where L is in meters 12 µm + 0.80·L µm, where L is in meters 29 µm + 0.80·L µm, where L is in meters 57 µm + 0.80·L µm, where L is in meters |
| Length / Material measures of length | Measuring tapes 0 ÷ 50 m Measuring tapes with weight 0 ÷ 50 m Meters 0 ÷ 1 m Rules 0 ÷ 5 m Dipsticks 0 ÷ 5 m |
0.31 mm + 14·10-6·L mm, where L is in meters 0.011 mm + 14·10-6·L mm, where L is in meters 0.31 mm + 14·10-6·L mm, where L is in meters |
| Length / Laser distance meter | 0 ÷ 250 m | 0.32 mm |
| Length / Sieves | 20 µm ÷ 1000 µm 1 mm ÷ 125 mm |
0.00058 mm 0.0013 mm |
| Length / Thread plug gauge | Pitch diameter 0 ÷ 75 mm 75 mm ÷ 100 mm Major diameter 0 ÷ 75 mm 75 mm ÷ 100 mm |
1.8 µm 3.8 µm 1.1 µm 3.5 µm |
| Length / Thread ring gauge | Pitch diameter 0 ÷ 100 mm Major diameter 0 ÷ 100 mm |
1.8 µm 1.2 µm |
| Length / Ultrasound thickness gauges (thickness – steel) | 2 mm ÷ 200 mm | 0.019 mm ÷ 0.042 mm |
| Length / Coating thickness gauges | 49 µm ÷ 806 µm | 1.4 µm ÷ 2.0 µm |
| Degrees / Angle gauges | 0 ÷ 180° | 18″ |
| Degrees / Bevel protractors | 0 ÷ 360° | 25″ |
| Pressure / Vacuum gauges, pressure-vacuum gauges, technical, oxygen, electrocontact manometers | -0.08 MPa ÷ 0 0 ÷ 0.6 MPa 0 ÷ 6 MPa 0 ÷ 60 MPa |
0.22% 0.034% 0.044% 0.013% |
| Pressure / Electromechanical manometers | 0 ÷ 2 MPa 0 ÷ 7 MPa 0 ÷ 30 MPa 0 ÷ 60 MPa |
0.016 % 0.012 % 0.017 % 0.013 % |
| Pressure / Pressure transducers | 0 ÷ 3 MPa 0 ÷ 60 MPa |
0.015 % 0.016 % |
| Pressure / Sphygmomanometers | 0 ÷ 300 mmHg | 0.58 mmHg |
| Direct voltage / Generation (multimeters, voltmeters, measuring clamps, direct voltage meters) | 0 mV ÷ 200 mV 0.2 V ÷ 2 V 2 V ÷ 20 V 20 V ÷ 200 V 200 V ÷ 1000 V |
0.0029 mV 0.000030 V 0.000083 V 0.00081 V 0.0051 V |
| Alternating voltage (10 Hz ÷ 500 kHz) / Generation (multimeters, voltmeters, alternating voltage meters) | 0 mV ÷ 200 mV 0.2 V ÷ 2 V 2 V ÷ 20 V 20 V ÷ 200 V 200 V ÷ 1000 V |
0.087 mV 0.00077 V 0.0093 V 0.13 V 0.61 V |
| Direct current / Generation (multimeters, ammeters, wattmeters, direct current meters) | 0 µA ÷ 200 µA 0.2 mA ÷ 2 mA 2 mA ÷ 20 mA 20 mA ÷ 200 mA 0.2 A ÷ 2 A 2 A ÷ 30 A |
0.043 µA 0.00017 mA 0.00078 mA 0.012 mA 0.00021 A 0.0022 A |
| Direct current / Generation (current clamps) | 0 A ÷ 100 A 100 A ÷ 1500 A |
0.31 A 0.40 A |
| Alternating current (10 Hz ÷ 10 kHz)/ Generation (multimeters, ammeters, alternating current meters) | 0 µA ÷ 200 µA 0.2 mA ÷ 2 mA 2 mA ÷ 20 mA 20 mA ÷ 200 mA 0.2 A ÷ 2 A 2 A ÷ 30 A |
0.33 µA 0.0012 mA 0.011 mA 0.12 mA 0.0021 A 0.018 A |
| Alternating current (10 Hz ÷ 10 kHz)/ Generation (current clamps) | 0 A ÷ 100 A 100 A ÷ 1500 A |
0.31 A 0.40 A |
| Power (alternating voltage, 50 Hz ÷ 400Hz) / Generation (wattmeters) | 0 W ÷ 40 W 40 W ÷ 400 W (0 ÷ 2 A, 0 ÷ 200 V) 400 W ÷ 2000 W (0 ÷ 2 A, 200 V ÷ 1000 V) 0 W ÷ 600 W 600 W ÷ 6000 W (2 A ÷ 30 A, 0 ÷ 200 V) 6000 W ÷ 30000 W (2 A ÷ 30 A, 200 V ÷ 1000 V) |
0.039 W 0.43 W 2.1 W 0.26 W 3.8 W 17 W |
| Power (direct voltage) / Generation (wattmeters) | 0 W ÷ 40 W 40 W ÷ 400 W (0 ÷ 2 A, 0 ÷ 200 V) 400 W ÷ 2000 W (0 ÷ 2 A, 200 V ÷ 1000 V) 0 W ÷ 600 W 600 W ÷ 6000 W (2 A ÷ 30 A, 0 ÷ 200 V) 6000 W ÷ 30000 W (2 A ÷ 30 A, 200 V ÷ 1000 V) |
0.0089 W 0.089 W 0.45 W 0.090 W 0.90 W 4.5 W |
| Resistance / Generation (ohmeters, multimeters, earth resistance meters, circuit testers, resistance meters) | 0.01 Ω ÷ 0.1 Ω 0.1 Ω 1 Ω 10 Ω 100 Ω 1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ 100 MΩ 1000 MΩ |
5.5 mΩ 0.075 mΩ 0.0034 Ω 0.0042 Ω 0.0078 Ω 0.061 Ω 0.61 Ω 5.6 Ω 0.11 kΩ 0.0032 MΩ 0.38 MΩ 10 MΩ |
| Resistance (0 ÷ 2500 V) / Generation (megohmmeters) | 100 kΩ 500 kΩ 1 MΩ 10 MΩ 100 MΩ 250 MΩ 400 MΩ 1 GΩ 10 GΩ |
0.036 kΩ 0.27 kΩ 0.0075 MΩ 0.0016 MΩ 0.055 MΩ 1.6 MΩ 2.5 MΩ 0.0060 GΩ 0.045 GΩ |
| Capacity / Generation (multimeters, capacitance meters) | 1 nF 10 nF 20 nF 50 nF 100 nF 1μF 10 μF 100 µF 1 mF 10 mF |
0.0025 nF 0.024 nF 0.048 nF 0.12 nF 0.24 nF 0.0038 µF 0.056 µF 0.57 µF 0.0099 mF 0.10 mF |
| Frequency / Generation (multimeters, hertz meters, frequency meters) | 10 Hz 100 Hz 1 kHz 10 kHz 20 kHz 50 kHz 100 kHz 1 MHz 10 MHz |
0.000035 Hz 0.000035 Hz 0.019 Hz 0.019 Hz 0.019 Hz 0.027 Hz 0.035 Hz 0.019 kHz 0.019 kHz |
| Resistance / Measuring (resistance boxes, calibrators, sources of electrical parameters) | 0.1 Ω ÷ 100 Ω 0.1 kΩ ÷ 1 kΩ 1 kΩ ÷ 10 kΩ 10 kΩ ÷ 100 kΩ 0.1 MΩ ÷ 1 MΩ 1 MΩ ÷ 10 MΩ 10 MΩ ÷ 100 MΩ |
0.00062 Ω 0.013 kΩ 0.00010 kΩ 0.0010 kΩ 0.0096 kΩ 0.0058 MΩ 0.65 MΩ |
| Direct voltage / Measuring (calibrators, sources of electrical parameters) | 0 ÷ 100 mV 100 mV ÷ 1 V 1 V ÷ 10 V 10 V ÷ 100 V 100 V ÷ 1000 V |
0.0051 mV 0.000051 V 0.00014 V 0.0015 V 0.013 V |
| Alternating voltage (3 Hz ÷ 300 kHz) / Measuring (calibrators, sources of electrical parameters) | 0 ÷ 100 mV 100 mV ÷ 1 V 1 V ÷ 10 V 10 V ÷ 100 V 100 V ÷ 750 V |
0.14 mV 0.0012 V 0.013 V 0.16 V 0.79 V |
| Direct current / Measuring (calibrators, sources of electrical parameters) | 0 ÷ 1 mA 1 mA ÷ 10 mA 10 mA ÷ 100 mA 0.1 A ÷ 1 A 1 A ÷ 10 A |
0.30 µA 1.3 µA 0.021 mA 0.34 mA 2.5 mA |
| Alternating current (3 Hz ÷ 300 kHz) / Measuring (calibrators, sources of electrical parameters) | 0 ÷ 1 mA 1 mA ÷ 10 mA 10 mA ÷ 100 mA 0.1 A ÷ 1 A 1 A ÷ 10 A |
2.0 µA 0.020 mA 0.20 mA 2.8 mA 0.029 A |
| Frequency / Measuring (calibrators, sources of electrical parameters) | 3 Hz ÷ 10 Hz 10 Hz ÷ 100 Hz 100 Hz ÷ 1 kHz 1 kHz ÷ 100 kHz 100 kHz ÷ 300 kHz |
0.00018 Hz 0.00082 Hz 0.032 Hz 0.00048 kHz 0.032 kHz |
| Temperature / Digital thermometers | -30°C ÷ 1000°C resolution ≥ 0.01°C |
0.023°C ÷ 1.2°C |
| Temperature / Liquid-in-glass, electrocontact liquid-in-glass thermometers | -30°C ÷ 260°C resolution ≥ 0.1°C |
0.021°C ÷ 0.090°C |
| Temperature / Manometric, bimetallic thermometers | -30°C ÷ 600°C resolution ≥ 0.5°C |
0.29°C ÷ 0.58°C |
| Temperature / Resistance thermometers | -30°C ÷ 650°C | 0.039°C ÷ 0.60°C |
| Temperature / Infrared (distance) thermometers, thermographic cameras | -30°C ÷ 500°C resolution ≥ 0.1°C 500°C ÷ 1700°C resolution ≥ 1.0°C |
0.13°C ÷ 0.25°C 1.3°C ÷ 4.3°C |
| Temperature / Temperature transducers | -30°C ÷ 1000°C resolution 0.01°C |
0.0088 % ÷ 0.18 % |
| Humidity / Hygrometers | 30 %RM ÷ 100 %RM | 2.2 %RM |
| Temperature / Built in thermometer in thermostats, ovens, drying cabinets | -30°C ÷ 600°C resolution < 0.1°C -30°C ÷ 1000°C resolution ≥ 0.1°C |
0.023°C 0.12°C ÷ 1.2°C |
| Torsional moment / Torque wrenches | 2 Nm ÷ 100 Nm 25 Nm ÷ 1100 Nm |
0.10% 0.10% |
| Force / Dynamometers | 0 ÷ 300 kN | 0.029 % ÷ 0.20 % |
| Rotation speed / Optical tachometers | 60 rpm ÷ 3000 rpm 3000 rpm ÷ 60000 rpm |
0.10 rpm 1.0 rpm |
| Rotation speed / Centrifuges | 100 rpm ÷ 1000 rpm 1000 rpm ÷ 60000 rpm |
0.069 rpm ÷ 0.074 rpm 1.7 rpm ÷ 5.1 rpm |
| Gas concentration / Explosive and other gas concentrations analyzers, detectors | 0 ÷ 100 % ZSR CO, NO, CO2, SO2, CH4, C4H10, H2, H2S, O2, C3H8 |
2 % relative |
| Gas concentration / Flue gas analyzers | 0 ÷ 100 tilp % CO, NO, CO2, SO2, O2 |
2 % relative |
| Hydrogen ion concentration / pH meters Oxidation-reduction potential / ORP meters |
0 ÷ 14.00 pH -2000 mV ÷ 2000 mV -2000 mV ÷ 2000 mV |
0.043 pH ÷ 0.057 pH 0.064 mV ÷ 0.10 mV 0.064 mV ÷ 0.10 mV |
| Conductivity in a solution / Conductivity meters | 0 ÷ 199.9 mS/cm | 1.3 µS/cm ÷ 2.0 µS/cm |
| Frequency, voltage / Oscilloscopes (oscillographs) | 0.01 Hz ÷ 100 MHz 0 ÷ 1000 V RMS |
2.0 nHz ÷ 13 Hz 0.0012 V RMS ÷ 0.61 V RMS |
| Light / Luxmeters | 0 ÷ 1500 lx | 0.30 lx ÷ 92 lx |
| Sound/ Sound level meters | 94 dB, 104 dB, 114 dB (1 kHz) | 0.12 dB ÷ 0.16 dB |