Baumer Authorized Dealer in India · Data Sheet 31-08-12
Baumer CB Model — Stainless Steel Bimetal Industrial Thermometer
A rugged, no-power local temperature indicator built to EN 13190. All-stainless case and stem, dial sizes from 50 to 150 mm, bottom/back/every-angle entry, and an optional silicon-oil-filled version for vibrating installations — engineered for chemical, refinery, power, and process industries.
Product Overview
What Is the Baumer CB Model Bimetal Thermometer?
The Baumer CB Model is a stainless steel, direct-reading industrial thermometer built to EN 13190 — the European standard governing bimetal thermometer construction, accuracy and scale marking. Instead of relying on electronics, the CB Model uses a coiled bimetal strip inside the stem that mechanically drives the dial pointer as temperature changes, giving plant personnel an instant, reliable local reading without any power supply, wiring, or signal loop.
This mechanical simplicity is precisely why bimetal thermometers remain a standard fixture in process plants: there is no transmitter to fail, no cable to route, and no calibration drift from electronic component aging. For local temperature indication on pipelines, vessels, and rotating equipment — where an operator simply needs to glance at a dial during a routine walk-down — a well-built bimetal thermometer like the CB Model is often the most dependable and cost-effective instrument available.
The CB Model's all-stainless-steel case, bezel, and stem (AISI 304 SS case/bezel, AISI 316 SS stem and connection, joined by TIG Argon Arc welding) extend its service life in corrosive environments — chemical plants, refineries, fertilizer units, and pulp & paper lines — where a painted-steel or brass thermometer would corrode within a few seasons.
Need help matching a CB Model configuration to your process line? Our engineers review the spec before you order.
Talk to a Technical ExpertKey Features
What Makes the CB Model a Reliable Industrial Choice
Every feature of the CB Model is oriented around one goal: giving you a temperature reading you can trust, installation after installation, with minimal maintenance.
Stainless Steel Construction
AISI 304 SS case/bezel and AISI 316 SS stem resist corrosion in chemical and process environments.
Rugged Industrial Design
TIG Argon Arc welded joints and a bayonet-type case built for continuous plant-floor duty.
EN 13190 Compliance
Manufactured and scale-graduated to the European bimetal thermometer standard.
Class 1 Accuracy
Meets EN 13190 Class 1 accuracy — the tightest tolerance band for bimetal instruments.
No External Power Required
Purely mechanical operation — no wiring, transmitter, or power supply needed.
Long Service Life
Sealed, IP65-rated construction protects the movement from dust and moisture ingress over years of service.
Corrosion Resistance
All-SS wetted stem suits chemical, fertilizer, refinery and pulp/paper corrosive atmospheres.
Bottom Entry (Type 2)
Stem exits straight down from the case for vertical pipe or vessel installation.
Back Entry (Type 4)
Stem exits directly behind the case for horizontal, in-line pipe mounting.
Every-Angle Entry (Type 8)
Dial rotates independently of the stem, so it can be read from any convenient viewing angle.
Optional Silicon Oil Filling
Options QA/QZ dampen pointer vibration on pumps, compressors and rotating machinery.
Optional Thermowell
Allows removal for calibration or replacement without interrupting the process.
Excellent Readability
Aluminium dial with black graduation on white background for high-contrast, at-a-glance reading.
Maintenance-Free Operation
No batteries, no electronics, no periodic component replacement under normal service.
Technical Data
CB Model — Full Technical Data
Specifications as per Baumer datasheet 31-08-12. Zebco Engineering can configure any combination below to match your process line.
| Parameter | Specification |
|---|---|
| Measuring principle | Bimetal strip, coiled |
| Dial size (NS) | 50, 63, 80, 100, 125, 150 mm |
| Standard | EN 13190 |
| Accuracy | Class 1 as per EN 13190 |
| Temperature range — 50 mm dial | Up to 150°C max. |
| Temperature range — 63 mm dial | Up to 300°C max. |
| Temperature range — 80/100/125/150 mm dial | Up to 500°C max. (compound ranges to -100/+60°C available) |
| Ambient temperature | -25°C to +65°C |
| Operating pressure | 15 kg/cm² (without thermowell) |
| Overrange limit | 110% of full scale |
| Stem diameter | 8 mm (standard) — 6, 6.35, 9.5, 10, 12 mm optional |
| Stem length | From 50 mm, below-thread max. 600 mm |
| Stem material | AISI 316 SS |
| Case, bezel & clamp | AISI 304 SS |
| Joints | TIG Argon Arc welding |
| Window material | Sheet glass (standard) · Plexi glass (silicon-oil-filled version) |
| Protection rating | IP 65 |
| Process connection | ½" BSP (M) fixed (standard); other threads on request |
| Thread/connection type | Adjustable (ZI), Fixed/Standard (ZJ), Revolving/Swivel (KJ) |
| Dial | Aluminium, black graduation on white background |
| Pointer | Aluminium, black, slotted zero-adjustable & fixed for NS 50/63mm |
| Zero adjustment | External, for mounting type 8 & 14 (except NS 50/63mm) |
| Gasket | Neoprene (standard) · Viton (silicon-oil-filled version) |
| Approvals | GOST-R (option) |
| Optional accessories | Thermowell, custom dial, SS tag plate, calibration certificate, material test certificate |
Silicon-Oil-Filled Version — Additional Specifications
| Parameter | Specification |
|---|---|
| Accuracy | Class 1 as per EN 13190 |
| Ambient temperature | Maximum 65°C |
| Window | Plexi glass |
| Dampening liquid | Silicon oil (option QA — up to 200°C · option QZ — up to 300°C) |
| Gasket & filling plug | Viton |
All other specifications for the silicon-oil-filled version follow the standard version above.
Nominal Ranges
Nominal Range, Measuring Range & Error Limits (per EN 13190)
The full set of standard scale ranges available on the CB Model, from deep-compound cryogenic-adjacent ranges to high-temperature process duty.
| Nominal Range (°C) | Measuring Range (°C) | Limit of Error (±°C) |
|---|---|---|
| -20 to +40 | -10 to +30 | 1 |
| -20 to +60 | -10 to +50 | 1 |
| -20 to +120 | -10 to +110 | 2 |
| -30 to +30 | -20 to +20 | 1 |
| -30 to +50 | -20 to +40 | 1 |
| -30 to +70 | -20 to +60 | 1 |
| -40 to +40 | -30 to +30 | 1 |
| -40 to +60 | -30 to +50 | 1 |
| -100 to +60 | -80 to +40 | 2 |
| 0 to 60 | 10 to 50 | 1 |
| 0 to 80 | 10 to 70 | 1 |
| 0 to 100 | 10 to 90 | 1 |
| 0 to 120 | 10 to 110 | 2 |
| 0 to 160 | 20 to 140 | 2 |
| 0 to 200 | 20 to 180 | 2 |
| 0 to 250 | 30 to 220 | 2.5 |
| 0 to 300 | 30 to 270 | 5 |
| 0 to 400 | 50 to 350 | 5 |
| 0 to 500 | 50 to 450 | 5 |
| 0 to 600 | 100 to 500 | 10 |
°F and dual °C/°F scales are available on request. Other custom scale ranges can be provided — contact Zebco Engineering to confirm feasibility for your dial size.
Available Variants
Dial Sizes, Stem Lengths, Mounting & Connection Options
The CB Model is built to order across six variant categories. Use this section to understand when each option applies.
Dial Sizes — When to Use Which
| Dial (NS) | Order Code | Max Range | Best Suited For |
|---|---|---|---|
| 50 mm | C | 150°C | Compact panels, tight-clearance skids, close-range viewing |
| 63 mm | D | 300°C | General-purpose pipeline and vessel indication |
| 80 mm | E | 500°C | Improved readability for standard process lines |
| 100 mm | F | 500°C | Most common size for plant-floor readability at a distance |
| 125 mm | G | 500°C | Panel-mounted or elevated installations needing long-range visibility |
| 150 mm | H | 500°C | Control-room-visible installations, large vessels, remote viewing points |
Mounting Types
Direct Bottom Entry
Stem exits straight down from the case centre — the standard choice for vertical pipe runs and top-entry tank connections. Available on all dial sizes except 50 mm.
Direct Center Back Entry
Stem exits directly behind the case, in line with the dial — ideal for horizontal pipe runs viewed face-on. Available across all dial sizes.
Every Angle Back Entry
The dial housing rotates independently of the stem so the face can be angled toward the operator regardless of pipe orientation. Available NS 80mm and above, with external zero adjustment.
A fourth option — Type 14, bottom entry through elbow — routes the stem downward via a 90° elbow behind the case, useful where the process connection is below the viewing line. Available NS 63mm and above.
Process Connections & Stem Diameter
| Code | Connection | Max Stem Diameter |
|---|---|---|
| 1BM / 1NM | 1/8" BSP(M) / NPT(M) | 6.35 mm |
| 2BM / 2NM | 1/4" BSP(M) / NPT(M) | 6.35 mm |
| 3BM | 3/8" BSP(M) | 10 mm |
| 4BM / 4NM | 1/2" BSP(M) (standard) / NPT(M) | 12 mm |
| 4MM | M20 x 1.5 | 12 mm |
| 4YN | 1½" Triclover (hygienic) | 12 mm |
Metric, PT, PF, flared, UNF, G or R connections available on request. NPT connections are not recommended for revolving/swivel process connection type.
Working Principle
How a Bimetal Thermometer Like the CB Model Actually Works
The CB Model's operation is entirely mechanical — a useful property to understand when explaining to a client why it needs no calibration loop or power source.
Bimetal Strip
Two metal strips with different thermal expansion coefficients are bonded together and coiled inside the stem.
Thermal Expansion
As process temperature rises, one metal expands faster than the other, causing the coil to twist proportionally to temperature.
Pointer Movement
The twisting coil is mechanically linked to the dial pointer shaft, converting rotational movement into a direct angular reading.
Temperature Indication
The pointer settles at the graduated scale position corresponding to the actual process temperature — read instantly, with no signal processing delay.
Industrial advantage: because the entire measuring chain is mechanical, there is no transmitter drift, no power interruption risk, and no signal cable to damage — a genuine advantage in areas where cabling is impractical or where redundant local indication is required alongside an electronic transmitter.
Applications
Where the CB Model Is Used
The CB Model's rugged, no-power design makes it the default choice for direct local temperature indication across a wide range of process equipment.
Boilers
Feedwater and steam-drum temperature indication where reliable local reading matters most.
Heat Exchangers
Inlet/outlet temperature monitoring on shell-and-tube and plate exchangers.
Steam Lines
Direct steam header temperature reading, often paired with a thermowell for isolation.
Process Pipelines
General pipeline temperature indication across chemical, refinery and utility lines.
Reactors
Vessel wall or dip-pipe temperature indication on batch and continuous reactors.
Storage Tanks
Bulk liquid storage temperature monitoring for viscosity-sensitive media.
Compressors
Discharge temperature monitoring — silicon-oil-filled version recommended for vibration.
HVAC Systems
Chilled and hot water loop temperature indication in building and industrial HVAC.
Water Treatment Plants
Process water temperature monitoring across treatment and dosing stages.
Chemical Processing
All-SS wetted parts handle corrosive process streams that would degrade painted-steel gauges.
Food Processing
Sanitary triclover connection option supports food and beverage process lines.
Industries Served
Industries That Rely on the Baumer CB Model
From upstream refining to food processing, the CB Model's corrosion-resistant, no-power design suits any plant where dependable local temperature indication is required.
Oil & Gas
Pipeline and separator temperature indication in upstream and midstream installations.
Chemical
Corrosive process stream monitoring with all-SS wetted stem construction.
Petrochemical
High-temperature process line indication across crackers and distillation units.
Power
Boiler, turbine and cooling circuit temperature indication in thermal power plants.
Steel
Cooling water and hydraulic system temperature monitoring in rolling mills.
Cement
Kiln auxiliary and cooling system temperature indication in dusty, high-heat zones.
Pharmaceutical
Clean, corrosion-resistant temperature indication for process and utility lines.
Food & Beverage
Sanitary triclover connections for bottling, brewing and processing lines.
Water Treatment
Process and effluent temperature monitoring across municipal and industrial WTPs.
Paper
Digester and bleaching line temperature indication resistant to pulp chemicals.
Textile
Dye bath and steam line temperature control in wet-processing areas.
Sugar
Boiling house and juice clarification temperature indication.
Marine
Engine room and hydraulic system temperature indication resistant to salt-air corrosion.
Mining
Hydraulic and cooling system temperature monitoring in remote mine-site equipment.
OEM Machinery
Panel-mount and compact dial options for skid packages and hydraulic power units.
HVAC
Chilled/hot water loop indication in commercial and industrial building systems.
Advantages
Why the CB Model Stands Up to Daily Plant Use
Reliable Operation
Purely mechanical measurement chain with no electronic failure points.
Long Mechanical Life
Sealed IP65 construction and stainless internals resist wear over years of service.
High Visibility
High-contrast black-on-white dial readable at a distance across dial sizes.
Cost Effective
Lower installed cost than an electronic loop for simple local-indication needs.
Maintenance Free
No batteries, firmware, or electronic components to service or replace.
Easy Installation
Threaded process connection installs directly into a pipe tap or thermowell.
Robust Construction
All-SS build with TIG-welded joints withstands plant-floor handling and vibration.
Suitable for Harsh Environments
Corrosive, humid, dusty and vibrating installations are all within its operating envelope.
Comparison Guides
How the CB Model Compares
Baumer CB (Bimetal) vs. Digital Temperature Gauge
| Factor | Baumer CB (Bimetal) | Digital Temperature Gauge |
|---|---|---|
| Power requirement | None — fully mechanical | Battery or external power required |
| Installed cost | Lower for simple local indication | Higher, especially with data logging features |
| Maintenance | Maintenance-free under normal service | Battery replacement, periodic recalibration |
| Readability in bright sunlight | Excellent — analogue dial, no screen glare | Can be difficult on LCD/LED displays |
| Remote data / alarm output | Not available (indication only) | Often available (4–20mA, relay, Bluetooth) |
| Best suited for | Simple, reliable local indication | Applications needing data logging or remote alarm |
Baumer CB (Bimetal) vs. Gas-Actuated Temperature Gauge
| Factor | Baumer CB (Bimetal) | Gas-Actuated Gauge |
|---|---|---|
| Sensing method | Coiled bimetal strip, direct-mount | Gas-filled bulb & capillary, remote-mount capable |
| Remote reading distance | Not applicable — dial mounts at the stem | Capillary allows dial to be located away from the process point |
| Typical accuracy | Class 1 per EN 13190 | Comparable, sometimes tighter over specific spans |
| Vibration resistance | Good; silicon-oil-filled option available | Good; capillary isolates dial from vibration source |
| Best suited for | Direct, accessible mounting points | Inaccessible or high-vibration process points needing remote dial placement |
Mechanical vs. Electronic Temperature Measurement
| Factor | Mechanical (Bimetal) | Electronic (RTD/TC + Transmitter) |
|---|---|---|
| Signal output | Local dial reading only | 4-20mA/HART for DCS/PLC integration |
| Response time | Slower — mechanical thermal lag | Faster, especially with thin-sheath RTDs |
| Long-term drift | Minimal if undamaged | Requires periodic recalibration |
| Redundancy value | Ideal as a local backup alongside an electronic loop | Primary source for automated control |
Selection Guide
How to Configure Your CB Model Order
Six decisions define a complete CB Model specification. Use the guide below, or send us your P&ID line data and we'll configure it for you.
1. Dial Size
Match viewing distance to dial size — the further the operator stands from the gauge, the larger the dial should be.
- Panel/OEM skid, close viewing: 50–63 mm
- Standard pipe run, arm's-length viewing: 80–100 mm
- Elevated or distant viewing: 125–150 mm
2. Stem Length
Stem length must achieve adequate immersion depth into the process stream, not just reach the pipe wall.
- Small pipes (under 2"): use a thermowell with a stem sized to reach the pipe centreline
- Large vessels: confirm minimum immersion length per the stem-diameter/range selection table
- Never select a stem shorter than the minimum immersion length for your chosen range
3. Mounting Type
Choose based on pipe orientation and the direction from which the gauge will be read.
- Vertical pipe/top-entry tank: Type 2 (bottom entry)
- Horizontal pipe, viewed face-on: Type 4 (back entry)
- Pipe orientation doesn't match viewing angle: Type 8 (every angle)
4. Temperature Range
Select a nominal range where your expected operating temperature sits within the middle third of the scale for best readability and accuracy.
- Ambient/utility lines: 0–100°C or 0–120°C
- Steam/process heat: 0–300°C or 0–500°C
- Sub-zero or cryogenic-adjacent: -100 to +60°C compound range
5. Thermowell
Recommended whenever the line may need servicing without a full process shutdown, or where stem corrosion/erosion risk is significant.
- High-pressure or high-velocity lines: thermowell strongly recommended
- Low-pressure, non-critical utility lines: optional
6. Connection Size
Match the process connection to your existing pipe tap standard and required stem diameter.
- Standard process tap: ½" BSP(M), 12mm stem
- Small instrument tap: 1/8"–1/4" BSP/NPT, 6.35mm stem
- Hygienic/sanitary line: 1½" Triclover connection
Installation Guidelines
Getting the Most Accurate Reading From Your CB Model
Mounting Position
Install so the dial faces the normal operator walkway or control point — select mounting type accordingly rather than forcing a fixed-angle gauge into an awkward viewing position.
Thermowell Installation
Fit the thermowell before commissioning and tighten to the specified torque; verify the stem seats fully in the thermowell bore for accurate heat transfer.
Avoiding Vibration
On pumps, compressors or rotating equipment, specify the silicon-oil-filled version (QA/QZ) to prevent premature movement wear from continuous vibration.
Correct Stem Immersion
Ensure the sensing portion of the stem is fully immersed in the process flow — insufficient immersion causes conductive heat loss along the stem and an inaccurate low reading.
Maintenance Tips
Periodically inspect the window and dial for fogging or cracking, verify zero-point accuracy against a reference thermometer annually, and check thermowell tightness during routine turnarounds.
Overrange Caution
Avoid prolonged exposure beyond 110% of full scale — while the CB Model tolerates brief overrange, sustained exposure can affect long-term calibration accuracy.
Why Buy From Zebco Engineering LLP
Your Authorized Source for Genuine Baumer CB Model Thermometers
Genuine Baumer Products
Authorized dealer supply with full manufacturer traceability — no grey-market risk.
Technical Support
Configuration review against your P&ID before quotation, not just order processing.
Competitive Pricing
Transparent quotations with volume pricing for bulk and repeat orders.
Bulk Orders
Coordinated multi-item, multi-delivery supply for plant turnarounds and expansions.
Fast Delivery
Stocked common configurations dispatch quickly for urgent maintenance needs.
Export Support
Full export documentation, commercial invoicing and compliance packs for international orders.
Pan India Supply
Reliable dispatch to every major industrial cluster across India.
OEM Support
Recurring supply agreements and custom dial/branding for machine builders.
After-Sales Service
Calibration guidance and technical troubleshooting support after delivery.
Downloads
CB Model Reference Documents
Request any of the following documents alongside your enquiry.
Frequently Asked Questions
CB Model — Technical FAQ
Common questions from instrumentation engineers and procurement teams about the Baumer CB Model.
A stainless steel bimetal industrial thermometer built to EN 13190, using a coiled bimetal strip for direct, no-power local temperature indication.
Up to 150°C on the 50mm dial, 300°C on the 63mm dial, and 500°C on the 80–150mm dials, with compound ranges down to -100°C available.
Class 1 per EN 13190, the tightest accuracy tolerance defined by the standard for bimetal thermometers.
No — it operates entirely mechanically via the thermal expansion of its bimetal sensing element.
AISI 304 SS for the case, bezel and clamp; AISI 316 SS for the stem and connection, joined by TIG Argon Arc welding.
½" BSP(M), fixed, as standard; alternative BSP, NPT, metric and Triclover connections are available.
Type 2 is direct bottom entry (stem down), Type 4 is direct center back entry (stem behind case), and Type 8 is every-angle back entry, letting the dial rotate to any viewing angle.
Bottom entry through elbow — the stem routes downward via a 90° elbow behind the case, for installations where the process tap sits below the natural viewing line.
Stem lengths start from 50 mm and go up to 600 mm below the thread, selected according to the range and stem diameter selection table.
6 mm, 6.35 mm, 8 mm (standard), 9.5 mm, 10 mm, and 12 mm.
15 kg/cm² is the maximum operating pressure when the stem is installed directly into the process, without a thermowell.
A thermowell allows the thermometer to be removed for calibration or replacement without interrupting the process, and protects the stem from direct pressure and flow exposure.
IP 65 as standard — dust-tight and protected against low-pressure water jets.
When the installation is exposed to mechanical vibration, such as on pumps, compressors or rotating machinery — the oil fill dampens pointer flutter and protects the movement.
Both are silicon oil dampening fills; QA is rated up to 200°C and QZ up to 300°C process temperature.
Maximum 65°C ambient temperature, versus -25°C to +65°C for the standard dry version.
Yes — external zero adjustment is available for mounting types 8 and 14, except on NS 50mm and 63mm dials, which use an internal slotted zero adjustment.
Sheet glass on the standard version; plexi glass on the silicon-oil-filled version.
Neoprene on the standard version; Viton on the silicon-oil-filled version (gasket and filling plug).
Yes, option PS provides an AISI 316 SS case and bezel, available for NS 100mm dials and above.
Yes, option PW provides a five-point calibration certificate for the specified measuring range.
Yes, option GH provides material test certificates for wetted parts with chemical composition testing; consult the factory for other certification needs.
Yes, option RX provides shatterproof/safety glass, and option RZ provides toughened glass.
Yes, option RH allows a custom-designed dial, and option SW allows dial tag marking.
GOST-R approval is available as an option; confirm current certification status with Zebco Engineering before ordering for regulated projects.
Chemicals, refinery, fertilizer, petrochemicals, pharmaceutical, power, cement, sugar, food, beverages, pulp, paper, and other corrosive-media process industries.
CB . [Nominal Size] . [Mounting Type] . [Pressure Connection] . [Connection Type] . [Stem Diameter] . [Stem Length] . [Range] . [Optional Extras] — for example, CB.F.4.4BM.ZJ.2C.300mm.0/300°C.
Yes, using process connection type KJ; note that NPT threads are not recommended for revolving/swivel connections — use BSP threads instead.
The CB Model mounts its dial directly at the stem/process point, while a gas-actuated thermometer uses a capillary to place the dial at a distance from the sensing bulb — useful when the process point itself is inaccessible for viewing.
Yes. Zebco Engineering LLP is an authorized Baumer dealer supplying pan India and internationally, with export documentation support for international orders. Contact +91 98982 26321 or sales@zebcoeng.com.
Lead time depends on dial size, range and optional extras selected; stocked standard configurations dispatch faster than fully custom builds. Share your specification with our team for a project-specific lead time.
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