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Fluke Calibration 6109A & 7109A Portable Calibration Baths

Portable calibration baths designed for clean process applications

Process manufacturing plants for pharmaceuticals, biotechnology, and food production utilize many sanitary temperature sensors that require regular calibration. Production must stop while the calibrations are taking place. Therefore, more calibration throughput means less plant downtime. And in businesses where even a few tenths of a degree Celsius can cost thousands of dollars in ruined product, temperature accuracy is crucial to maintaining quality.

The Fluke Calibration 6109A and 7109A Portable Calibration Baths let process industry professionals calibrate four times more sanitary sensors per batch in less time and with twice the accuracy of other baths in this class. Up to four tri-clamp sanitary sensors fit easily into these baths form calibration at ± 0.1 °C temperature display accuracy. Throughput is even higher for sanitary RTDs with small or no flanges.

Two bath models cover a wide temperature range: 35 °C to 250 °C for the 6109A and -25 °C to 140 °C for the 7109A. Each model offers a “-P” version that includes process electronics for connecting an external reference probe.

Professionals working in clean process industries, including facilities managers, production engineers and calibration technicians, prefer these baths for a variety of reasons.

Facilities managers who need to meet U.S. FDA and ISO clean room standards like the baths’ stainless steel casing that stands up to harsh cleaning solutions. They depend on the 6109A and 7109A to help maintain the accuracy of the plant’s temperature sensors, thus reducing the possibility of an expensive product batch loss.

Production engineers also appreciate the baths’ accuracy, which helps them control sensor out-oftolerance conditions. Moreover, they prefer to use a bath designed specifically for clean room calibration throughput. No more need to make do with equipment designed for some other application.

Calibration technicians who perform calibrations on platforms, in crawl spaces, and other hard to-reach parts of the plant enjoy the portability and clean room compatibility (i.e. easy to sanitize, don’t harbor bacteria) of these baths

Why Buy the Fluke Calibration Portable Bath Thermometer Calibrator from Transcat? Calibration. Selection. Price.

Transcat is a leading supplier of Fluke Calibration instruments, and can offer accredited calibrations on new orders. Check out our ordering guide to ensure that we provide you with the very best product for your application. To request more information, technical support, get a quote, or place an order, feel free to call us, chat us, request a quote, or add to cart!


Temperature specifications
The temperature specifications include environmental temperature effects from 13 °C to 33 °C.
Range (at 25 °C ambient temperature) 35 °C to 250 °C –25 °C to 140 °C (–15 °C cover off)
Accuracy (maximum permissible error) 0.1 °C 0.1 °C
Stability 0.015 °C 0.01 °C
Typical uniformity 0.03 °C up to 200 °C
0.04 °C above 200 °C
0.02 °C
Repeatability 0.04 °C 0.04 °C
Typical heating time 35 °C to 100 °C: 25 minutes
100 °C to 250 °C: 45 minutes
–25 °C to 25 °C: 35 minutes
25 °C to 140 °C: 55 minutes
Typical cooling time 250 °C to 100 °C: 35 minutes
100 °C to 35 °C: 55 minutes
140 °C to 25 °C: 45 minutes
25 °C to –25 °C: 75 minutes
Typical settling time 15 minutes 10 minutes
Process Input Module Specifications (-P models)
The Input Module specifications include calibration uncertainty, linearity, repeatability, resolution, stability, and environmental temperature effects from 13 °C to 33 °C.
Function Range Accuracy (Maximum Permissible Error)
Reference input resistance 0 Ω to 42 Ω
42 Ω to 400 Ω
0.0025 Ω
0.006 %
Reference input temperature -25 °C to 250 °C 0.007 % + 0.015 °C
Resistance sensing current 1 mA 8 %
DUT 4-wire resistance 0 Ω to 31 Ω
31 Ω to 400 Ω
0.0025 Ω
DUT 3-wire resistance accuracy 0 Ω to 400 Ω 0.12 Ω
Thermocouple mV -10 mV to 100 mV 0.025 % + 0.01 mV
Reference junction temperature 0 °C to 40 °C 0.35 °C
Thermocouple temperature -25 °C to 250 °C J: 0.44 °C K: 0.49 °C T: 0.53 °C
E: 0.44 °C N: 0.57 °C M: 0.48 °C
L: 0.42 °C U: 0.48 °C
0 °C to 250 °C R: 1.92 °C S: 1.88 °C C: 0.84 °C
D: 1.12 °C G/W: 3.34 °C
mA range 0 mA to 22 mA 0.02 % + 0.002 mA
mA range 24 V dc ± 6 V

* The product specifications describe the Absolute Instrumental Uncertainty of the 6109A/7109A baths at 95 % level of confidence (coverage factor k = 2) within one year from calibration.


    1. 1. Tank – The stainless steel tank contains the bath fluid.

    1. 2. Bath Fluid – Temperature sensors are inserted into the bath fluid for calibration.

    1. 3. Control Sensor – A precision platinum resistance thermometer (PRT) control sensor measures and controls the temperature of the bath fluid.

    1. 4. Stir Motor Cover – Protects the stir motor.

    1. 5. Stir Motor (under the Stir Motor Cover) – Drives the propeller that circulates the fluid to produce a uniform temperature.

    1. 6. Stir Guard – Separates the working area of the tank from the stir propeller. MIN and MAX marks show the correct fill levels.

    1. 7. Propeller – Stirs the bath fluid.

    1. 8. Ready Indicator – Changes from amber to green when the bath fluid temperature has settled at the setpoint. Green indicates that the bath is ready to begin measuring.

    1. 9. Carrying Handle – Use the carrying handle to lift or move the bath. There are also recessed handles on the side of the bath (not shown).

    1. 10. Threaded Holes – Used to attach accessories to the bath.

  1. 11. Tank Cover – Isolates the bath fluid from the environment, reduces fumes, prevents objects from falling into the tank, and keeps the fluid temperature stable.
 Fluke Calibrations Key Features



    1. 1. Fan – Cools the tank and heating devices (7109A model shown).

    1. 2. USB Host Port – Used to record temperature data to a memory device.

    1. 3. USB Device Port – Used to control the bath remotely.

    1. 4. RS-232 Port – Used to control the bath remotely.

    1. 5. Control Panel (see Control Panel detail).

  1. 6. Process Input Module – The optional module includes a Reference PRT Connection and inputs to measure electrical temperature sensors for calibration.
 Fluke Calibrations Key Features



 Fluke Calibration 6109 & 7109 Features
    1. 1. Display – Shows important information about the bath such as the fluid temperature and setpoint.

    1. 2. Softkeys – These keys correspond to the display icons directly above each key and perform a variety of useful functions. The functions change with the status of the display.

    1. 3. Mode Keys – The Monitor, Setpoint, Program, and the Setup keys access different groups of settings. Some mode keys light up when the mode is active.

    1. 4. Other Keys – The Number keys, Cursor keys, and a Select/Enter key enable you to make menu choices quickly and easily. Number keys let you enter decimal numbers.

  1. 5. Hot Warning Indicator – This indicator lights up if the fluid temperature is greater than or equal to 60 °C. This warns that the bath fluid, tank cover, and area around the tank are hot and should not be touched. If the bath is switched off, the indicator stays on until the bath reaches a safe temperature. It flashes at a slow rate to conserve energy.
  2. 6. STOP Button – Immediately disables heating and cooling and switches off the stir motor.



    1. 1. Current Fuse – Protects the Process Input Module and connected devices from accidental short circuit.

    1. 2. RTD Terminals – A test RTD connects to these terminals. The graphic on the panel shows the circuit diagram for a four-wire RTD.

    1. 3. Reference PRT Connector – A reference probe plugs into this socket. Recommended Fluke Reference PRTs are models 5615-9-A and 5626-12-A. Other Fluke Reference PRTs with Type A INFO-CON termination are also compatible.

    1. 4. Thermocouple Input – A connector for a miniature thermocouple.

  1. 5. Transmitter Terminals – A 4-20 mA transmitter connects to the two transmitter terminals labelled mA LOOP and COM.
 Fluke Calibrations Key Features

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Fluke Calibration 6109A-156 Fluke Calibration 6109A-156

Portable Bath, 35C to 250C, 115 VAC

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Fluke Calibration 7109A-156 Fluke Calibration 7109A-156

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Fluke Calibration 6109A-P-156 Fluke Calibration 6109A-P-156

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Order #: 6109A-P-156

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Fluke Calibration 7109A-P-156 Fluke Calibration 7109A-P-156

Portable Bath, -25C to 140C, w/Process Electronics, 115 VAC

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Overview :

Fluke Calibration 6109A & 7109A Highlights

  • Calibrate up to four tri-clamp sanitary sensors at the same time
  • Wide temperature ranges cover most process applications:
    • 6109A: 35 °C to 250 °C
    • 7109A: –25 °C to 140 °C
  • Excellent display accuracy of ±0.1 °C provides 4:1 test uncertainty ratio (TUR) for critical applications
  • Easy to transport up stairs and across catwalks
  • Stainless steel casing withstands harsh sterilizing chemicals and is rust proof
  • Easy to use and maintain
  • Global Fluke support and service

Accessories :

Fluke Calibration 7109-2080 4810215 Fluid Expansion Overflow Kit for 6109 & 7109

Ships in 2-3 weeks

$185.00 USD

$166.50 USD

Fluke Calibration 7109-2051 4810226 Single Probe Clamp Kit for 6109 & 7109

Ships in 2-3 weeks

$165.00 USD

$148.50 USD

Fluke Calibration 7109-2027 4810232 Adjustable Probe Holding Fixture for 6109 & 7109

Ships in 2-3 weeks

$85.00 USD

$76.50 USD

Fluke Calibration 7109-2013-1 4810244 Transport Cover for 6109 & 7109

Ships in 2-3 weeks

$65.00 USD

$58.50 USD

Fluke Calibration 7109-2013-2 4810259 Probe Access Cover for 6109 & 7109

Ships in 2-3 weeks

$65.00 USD

$58.50 USD

Fluke Calibration 7109-CASE 4810267 Carrying Case for 6109 & 7109

Ships in 2-3 weeks

$865.00 USD

$778.50 USD

Accessories :