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The Elcometer 331 Mk2 Basic BH Model Concrete Cover Meter (part number W331BH-2) locates and orientates reinforcement bars in concrete, measures the depth of cover over the rebar, and takes half-cell measurements, all from a single gauge.
Insufficient cover over reinforcement leaves rebar exposed to moisture and chloride ingress, which leads to corrosion and concrete failure, so confirming cover depth and identifying areas at risk of corrosion is central to structural inspection. The covermeter locates rebar and determines its orientation quickly and accurately, displaying a large cover reading in millimetres or inches with a signal strength bar. The half-cell capability adds a large half-cell reading in millivolts, indicating where corrosion is most likely. Three sound modes assist location: Locate, where the tone rises as the head approaches rebar, Under Cover, which sounds only for low cover, and Maxpip, which sounds as the head passes the rebar centre.
This Basic BH model is a covermeter with half cell; search heads and half-cell probes are ordered separately. It carries a large graphics display with backlight for dark environments, a multiple language menu structure, interchangeable heads with LED and keypad, user selectable bar range sizes and numbers, adjustable beep volume and an earphone socket. The rugged case is waterproof to IP65 for on-site use in harsh conditions. This model does not include memory, data logging, statistics, autosize or orthogonal bar diameter determination, RS232 output or Covermaster software links, which are reserved for higher models in the range.
The Elcometer 331 Mk2 can be used in accordance with ACI 318, ASTM C876, BS 1881:201, BS 1881:204, BS 8110, CP 110, DGZfP:B2, DGZfP:B3, DIN 1045, EC 2, SIA 162, SIS 2006, TR60 and UNI10174, the recognised standards for cover measurement and half-cell corrosion assessment. It is used by structural and concrete inspectors, and is supplied by BAMR, South Africa's authorised Elcometer distributor.
Elcometer 331 Mk2 Basic BH Model Concrete Cover Meters
An easy to use gauge that quickly and accurately locates/orientates reinforcement bars in concrete and measures the depth of cover over the rebar. Designed to meet IP65 this rugged waterproof gauge can be used in the harshest of environments.
- User Friendly Easy to transport and store; ergonomically shaped case for comfort; single handed operation with all functions accessible through 4 simple keys/buttons.
- Accurate Locate and determine orientation of rebar quickly, easily and accurately; up to 240,000 readings can be stored on the gauge; memory and data logging with data output to PC or direct to printer; graph plotting allows immediate visual indication of results.
- Reliable Stainless steel rebars can be located by the THD Model; battery packs can be charged in the unit or externally with additional batteries allowing continued use.
- Tough Specifically designed for use on-site; rugged, waterproof IP65 case provides protection against the elements; backlit screen for viewing in dark environments.
- Efficient Rebar locator, concrete covermeter and half-cell measurement all available in a single gauge (selected models); intuitive menus enable each gauge to be used straight from the box.
- Powerful Links to Covermaster Software; ultimate data management tool to store cover and half cell readings and produce professional reports; on-screen graphic display provides visual assessment of readings.
When to use the Elcometer 331 Mk2 BH Model Covermeter
Use the Elcometer 331 Mk2 BH Model on site when you need to locate rebar, measure cover depth and take half-cell readings from one rugged gauge. Its IP65 waterproof case suits harsh site conditions, and it stores up to 240,000 readings for reporting.
- 1Locate, cover and half-cell in oneRebar location, depth of cover and half-cell measurement sit in a single gauge, so a survey needs one instrument rather than several.
- 2IP65 rugged for on-site useThe waterproof, ergonomically shaped case with a backlit screen stands up to the elements and works in dark or dirty conditions.
- 3Large data logging and reportingUp to 240,000 readings store on the gauge and link to Covermaster Software, so cover and half-cell data turn into professional reports.
- 4Meets the concrete cover standardsIt conforms to BS 1881:204, BS 8110, ACI 318, ASTM C876 and others, so survey results satisfy the specs and audits you report against.
Lower-budget alternatives
Ten minutes on a call with one of our specialists usually saves you from buying the wrong instrument.
Book a 10-minute callOr , our product assistant, for an instant answer.
When to use this
When to use the Elcometer 331 Mk2 BH Model Covermeter
Use the Elcometer 331 Mk2 BH Model on site when you need to locate rebar, measure cover depth and take half-cell readings from one rugged gauge. Its IP65 waterproof case suits harsh site conditions, and it stores up to 240,000 readings for reporting.
- 1Locate, cover and half-cell in oneRebar location, depth of cover and half-cell measurement sit in a single gauge, so a survey needs one instrument rather than several.
- 2IP65 rugged for on-site useThe waterproof, ergonomically shaped case with a backlit screen stands up to the elements and works in dark or dirty conditions.
- 3Large data logging and reportingUp to 240,000 readings store on the gauge and link to Covermaster Software, so cover and half-cell data turn into professional reports.
- 4Meets the concrete cover standardsIt conforms to BS 1881:204, BS 8110, ACI 318, ASTM C876 and others, so survey results satisfy the specs and audits you report against.
Lower-budget alternatives
Ten minutes on a call with one of our specialists usually saves you from buying the wrong instrument.
Book a 10-minute callOr , our product assistant, for an instant answer.
Specifications
Elcometer 331 Models
• = available / compatible with that option or model
| Description | B | BH | SH | TH | THD |
|---|---|---|---|---|---|
| Covermeter / Rebar location | • | • | • | • | • |
| Half Cell measurement | • | • | • | • | |
| Rebar orientation | • | • | • | • | • |
| Depth of cover | • | • | • | • | • |
| Large cover (thickness) reading mm or inches | • | • | • | • | • |
| Large graphics display with backlight | • | • | • | • | • |
| Multiple language menu structure | • | • | • | • | • |
| signal strength bar | • | • | • | • | • |
| Interchangeable heads with LED & keypad | • | • | • | • | • |
| User selectable bar range sizes & numbers | • | • | • | • | • |
| Rugged waterproof case (IP65) | • | • | • | • | • |
| Adjustable beep volume & earphone socket | • | • | • | • | • |
| Measurement sound modes | • | • | • | • | • |
| Locate (tone increases as head approaches rebar) | • | • | • | • | • |
| Under Cover (tone only sound for low cover) | • | • | • | • | • |
| Maxpip (tone only as head passes rebar centre) | • | • | • | • | • |
| Half Cell capability | • | • | • | • | |
| Large half cell reading mV | • | • | • | • | |
| Autosize mode bar diameter determination | • | • | • | ||
| Orthogonal mode bar diameter determination | • | • | • | ||
| RS232 Output – direct to printer or PC | • | • | • | ||
| EDTS Excel link software | • | • | • | ||
| Covermaster software | • | • | • | ||
| Statistics | • | • | • | ||
| Minimum & maximum cover limits | • | • | • | ||
| Date & time | • | • | • | ||
| Memory | • | • | • | ||
| Linear batch memory | No Memory | No Memory | 10 Linear batches of 1,000 readings each | Up to 200 batches of 1,000 readings | Up to 200 batches of 1,000 readings |
| Grid batch memory | Up to 240,000 readings | Up to 240,000 readings | |||
| User certified batch size | • | • | |||
| Graphics Plot | • | • | |||
| Threshold plot | • | • | |||
| Stainless Steel measurement mode | • |
- Bar dimension range
- Click on the Bar Dimension Tab at the top for a range of Bar Dimensions
- Rechargeable power supply
- 7.4V lithium ion battery pack provides up to 32 hours of continuous use (20 hrs if backlight is on). Rechargeable in 4 hours either inside or outside the gauge using an external charger.
- Maximum operating temperature
- 50°C
- Unit dimensions
- 230 x 130 x 125mm
- Unit weight
- 1.54kg
- Part Number
- W331BH-2
- Description
- Elcometer 331² Model BH Covermeter with Half Cell (Order search heads or Half-Cell probes separately)
- Covermeter / Rebar location
- Yes
- Half Cell measurement
- Yes
- Rebar orientation
- Yes
- Depth of cover
- Yes
- Large cover (thickness) reading mm or inches
- Yes
- Large graphics display with backlight
- Yes
- Multiple language menu structure
- Yes
- Signal strength bar
- Yes
- Interchangeable heads with LED & keypad
- Yes
- User selectable bar range sizes & numbers
- Yes
- Rugged waterproof case (IP65)
- Yes
- Adjustable beep volume & earphone socket
- Yes
- Measurement sound modes
- Yes
- Locate (tone increases as head approaches rebar)
- Yes
- Under Cover (tone only sound for low cover)
- Yes
- Maxpip (tone only as head passes rebar centre)
- Yes
- Half Cell capability
- Yes
- Large half cell reading mV
- Yes
- Autosize mode bar diameter determination
- No
- Orthogonal mode bar diameter determination
- No
- RS232 Output
- No
- EDTS Excel link software
- No
- Covermaster software
- No
- Statistics
- No
- Minimum & maximum cover limits
- No
- Date & time
- No
- Grid batch memory
- No
- User certified batch size
- No
- Graphics Plot
- No
- Threshold plot
- No
- Stainless Steel measurement mode
- No
- Elcometer 331 2 Model B Covermeter (Supplied complete with Standard Search Head)
- W331B-2
- Elcometer 331 2 Model BH Covermeter with Half Cell (Order search heads or Half-Cell probe...
- W331BH–2
- Elcometer 331 2 Model SH Covermeter with Half Cell (Order search heads or Half-Cell probe...
- W331SH–2
- Elcometer 331 2 Model TH Covermeter with Half Cell (Order search heads or Half-Cell probe...
- W331TH–2
- Elcometer 331 2 Model THD Covermeter with Half Cell (Order search heads or Half-Cell prob...
- W331THD-2
- Elcometer 331 2 Standard Search Head
- TW33119124-1A
- Elcometer 331 2 Narrow Pitch Seach Head
- TW33119124-2A
- Elcometer 331 2 Deep Cover Search Head
- TW33119171A
- Elcometer 331 2 Borehole Probe 0 -40cm
- TW33119223-1A
- Elcometer 331 2 Borehole Probe 0 - 100cm
- TW33119223-2A
- Elcometer 331 2 Borehole Probe 0 - 16″
- TW33119223-3A
- Elcometer 331 2 Borehole Probe 0 40″
- TW33119223-4A
- Elcometer 331 2 Half Cell Probe Kit Cu/CuSO 4 (Cannot be used with Model B)
- TW331CUKIT
- Elcometer 331 2 Half Cell Probe Kit Ag/AgCl (Cannot be used with Model B)
- TW331AGKIT
- Elcometer 331 2 Half Cell Probe Cu/CuSO 4 (Cannot be used with Model B)
- TW33119688-1
- Elcometer 331 2 Half Cell Probe Ag/AgCl (Cannot be used with Model B)
- TW33119688-2
- Elcometer 331 2 High Tensile and Stainless Steel Dual search head (Can only be used with...
- TW33120014D
- Search Head Option A
- TW33119683
- Search Head Option B
- TW33119218
- Search Head Option C
- TW33119222
Standards
Standards
Accessories
Accessories
| Standard Search HeadDesign to meet most of your measurement requirements. | |
| Range | 40mm bar - 15mm to 95mm8mm bar - 8mm to 70mm |
| Dimensions | 155 x 88 x 42mm |
| Sensing area | 120 x 60mm |
| Narrow Pitch Search HeadAccurately measures the cover thickness when the gaps (pitch) between each of the rebars are close together. | |
| Range | 40mm bar - 8mm to 80mm8mm bar - 5mm to 60mm |
| Dimensions | 155 x 88 x 42mm |
| Sensing area | 120 x 60mm |
| Deep Cover Search HeadThe ideal search head for accurately measuring rebars that are deep within the structure. | |
| Range | 40mm bar - 35mm to 180mm8mm bar - 25mm to 160mm |
| Dimensions | 170 x 94 x 54mm |
| Sensing area | 160 x 80mm |
| Dual Search Head for high tensile and stainless steelsThe search head specifically designed to locate high tensile and stainless steel. | |
| Range | 40mm bar - 35mm to 180mm8mm bar - 25mm to 160mm |
| Dimensions | 170 x 94 x 54mm |
| Sensing area | 160 x 80mm |
| Borehole ProbeThe solution for locating tendon ducts and multiple layers of rebar lying deep within the concrete. | |
| Metric | Imperial |
| TW33119223-1A Short | TW33119223-3A Short |
| TW33119223-2A Long | TW33119223-4A Long |
| Measurement depth | Short Probe: 0 - 40cmLong Probe: 0 - 100cm |
| Approximate detection ranges | Tendon duct (70mm): up to 90mm |
| Half-Cell KitConsisting of either a copper electrode in a copper sulphate solution or a silver electrode in a sodium chloride solution, each half cell is a sealed unit - no need to mix chemicals. Supplied with a 25m / 80′ cable, every half-cell probe is guaranteed for 5 years. | |
| Copper/Copper Sulphate | TW331CUKIT |
| Silver/Silver Chloride | TW331AGKIT |
| Extension Cable 100m / 325ftThe extension cable for use with the half-cell kits gives the flexibility to take readings in difficult to reach areas. |
| Verification BlockThe verification block allows the user to check the calibration of their gauge in order to ensure maximum measurement accuracy. |
| Extension Arm KitThis kit allows the user to scan bridge decks and floor areas using the hand-held search heads from a standing position. Both the standard or narrow pitch search head can be attached to the extension arm. |
Bar Diameter
Bar Diameter
| Metric · Bar Size | Metric · Diam. (mm) | US Bar · Bar Size | US Bar · Diam. (Inch) | ASTM/Canadian · Bar Size | ASTM/Canadian · Diam. (mm² ) | Japanese · Bar Size | Japanese · Diam. (mm) |
|---|---|---|---|---|---|---|---|
| 5 | 5 | #2 | 0.25 | 10M | 100 | 6 | 6 |
| 5.5 | 5.5 | #3 | 0.375 | 15M | 200 | 10 | 10 |
| 6 | 6 | #4 | 0.5 | 20M | 300 | 13 | 13 |
| 7 | 7 | #5 | 0.625 | 25M | 500 | 16 | 16 |
| 8 | 8 | #6 | 0.75 | 30M | 700 | 19 | 19 |
| 9 | 9 | #7 | 0.875 | 35M | 1000 | 22 | 22 |
| 10 | 10 | #8 | 1 | 45M | 1500 | 25 | 25 |
| 11 | 11 | #9 | 1.125 | 55M | 2500 | 29 | 29 |
| 12 | 12 | #10 | 1.25 | 32 | 32 | ||
| 14 | 14 | #11 | 1.375 | 35 | 35 | ||
| 16 | 16 | #12 | 1.5 | 38 | 38 | ||
| 18 | 18 | #13 | 1.625 | 41 | 41 | ||
| 20 | 20 | #14 | 1.75 | 44 | 44 | ||
| 22 | 22 | #15 | 1.875 | 48 | 48 | ||
| 25 | 25 | #16 | 2 | 51 | 51 | ||
| 28 | 28 | #18 | 2.25 | 57 | 57 | ||
| 32 | 32 | ||||||
| 36 | 36 | ||||||
| 40 | 40 | ||||||
| 44 | 44 | ||||||
| 50 | 50 |
Frequently asked questions
What does the Elcometer 331 Mk2 Model BH measure that the base Model B does not?
The Model BH adds half-cell measurement capability, providing a half-cell reading in millivolts. The base Model B covers only rebar location, orientation, and depth of cover.
How is the gauge powered and how long does the battery last?
It uses a 7.4 V lithium-ion rechargeable battery pack providing up to 32 hours of continuous use, or 20 hours with the backlight on. The battery recharges in 4 hours, either inside or outside the gauge.
What is the IP rating and maximum operating temperature?
The gauge is rated IP65, meaning it is dust-tight and protected against water jets, suitable for use in harsh site environments. The maximum operating temperature is 50 degrees Celsius.
Does the Model BH include memory or data output?
No. The Model BH has no onboard memory and no RS232 or data output. Memory, statistics, and data connectivity are features of the higher SH, TH, and THD models.
Which half-cell probe types are compatible with the Model BH?
Both Cu/CuSO4 and Ag/AgCl half-cell probes and probe kits are available as accessories. Neither can be used with the base Model B.
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