Fluke 6109A and 7109A Portable Calibration Baths

Calibrate more sanitary sensors at a time – with confidence

The Fluke 6109A and 7109A baths calibrate most temperature sensor applications used in clean process manufacturing, including pharmaceutical bioreactors (-10 C to 100 °C), chemical reactors (200 °C), steam-in-place process (122 °C to 140 °C), autoclave sterilization (120 °C to 135 °C), food storage freezers (-25 °C), and food processing (0 °C to 220 °C).

A large tank volume (112 mm square tank opening x 154 mm depth) lets you immerse up to four sanitary sensors at the same time. Calibrate a batch of odd-shaped temperature sensors of varying lengths and diameters, and still have room for a reference thermometer. Fast heating and cooling times let you get the job done without spending a lot of time waiting for the bath to come to temperature and stabilize. Increase your sanitary sensor calibration throughput and decrease expensive production downtime.

Excellent system display accuracy of ± 0.1 °C. Accuracy covers all sources of error including calibration uncertainty, stability, uniformity, and repeatability. NVLAP accredited calibration is included standard. Fluke Calibration’s high metrological standards and conservative specifications mean you can have confidence in the measurements you make with the 6109A and 7109A Portable Calibration Baths.

Fluke 6109A and 7109A including the cleanroom

The 6109A weighs 16 kilograms (35 pounds) and the 7109A weighs 20 kilograms (44 pounds). They each feature a fixed, non-rotating bail handle, enabling most people to carry a bath with one hand. Single-handed carrying comes in handy when the job includes walking up and downstairs, across catwalks, and into other hard-to-reach environments. Two recessed handles on the bottom of each bath also make it easy to move from a shelf to a cart or benchtop. A sealed lid protects against fluid spills while moving the bath.

Stainless steel casing stands up to the harsh chemicals used to sterilize equipment for cleanroom use. Synthetic materials used for decals, keypads, and feet do not harbor bacteria. The keypad is sealed against moisture ingress to protect against damage during cleaning or in non-controlled environments.

Easy to use and maintain

Each bath features a large color display that indicates date and time, bath fluid temperature, setpoint temperature, control indicator when the fluid is at setpoint, and heating status. A ready indicator changes color from amber to green, giving you a 360-degree visual indication when the bath fluid has reached its setpoint temperature and is ready for you to start making measurements.

A hot warning indicator lights up if the fluid temperature reaches above 60 °C, warning the operator that the bath fluid and tank area are hot and should not be touched. An adjustable probe fixture holds up to four tri-clamp sensors securely inside the tank opening during calibration. An optional single probe clamp kit holds a reference probe.

Fluids expand when heated and may lead to fluid spills. Fluid spills create a mess, damage equipment, and create potential safety hazards. Fluke Calibration recommends the 7109-2080 overflow tank to prevent fluid spills and to protect your investment. The 6109A and 7109A include an overflow tube that directs excess fluid into the optional 7109-2080 overflow container. A separate drain tube makes it easy to remove bath fluid for replacement or transport.

I own a Fluke Calibration Micro-Bath. Why do I need Fluke 6109a and 7109a bath?

If you already own a Fluke Calibration Micro-Bath or dry-block calibrator, thank you for being a customer! We hope you are enjoying the portability and stability of these popular products.

However, there are a few reasons why you should consider adding a 6109A or 7109A bath:

  • Errors of just a few tenths of a degree Celsius can cause expensive losses in the ruined products. The 6109A and 7109A baths are twice as accurate as a Micro-Bath, helping you to reduce this risk.
  • The 6109A and 7109A have four times the calibration throughput of a Micro-Bath, which can only calibrate a single tri-clamp sensor at a time.
  • They’re made with materials that don’t harbor bacteria. Their stainless steel panels and tank are easy to clean and rust-resistant–perfect for cleanroom use.

We hope you will continue to use your Fluke Calibration Micro-Bath for many years to come. The 6109A or 7109A baths will also serve you well if you need the throughput, accuracy, and clean room readiness that they provide.

Backed by global Fluke support and service

The 6109A and 7109A are designed to meet demanding Fluke Calibration metrology specifications, so you can trust that they will perform the way we say they will. Need assistance? We offer world-class support both before and after the sale, via online chat, email, telephone, and through our service organizations. Rest easy knowing the value of your investment will be preserved now and into the future.

Fluke 6109A and 7109A Summary Specifications

General specifications
Size Height: 382 mm (15 in)
Width: 242 mm (9.5 in)
Depth: 400 mm (15.7 in)
Weight 6109A: 16 kg (35 lb)
7109A: 20 kg (44 lb)
Power requirements 100 V to 115 V (± 10 %) 50/60 Hz, 1150 W
200 V to 230 V (± 10 %) 50/60 Hz, 1150 W
Fluid volume 2.5 liters (0.66 gallons)
Fluid working area 75 mm x 75 mm (3 in x 3 in)
Maximum fluid depth 154 mm (6.1 in)
Factory calibration Traceable NVLAP-accredited calibration included


Temperature specifications
The temperature specifications describe the Absolute Instrumental Uncertainty at a 95 % level of confidence (coverage factor k = 2) within one year from calibration. The specifications include environmental temperature effects from 13 °C to 33 °C.
6109A 7109A
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
Display resolution 0.01 °, 0.001° 0.01 °, 0.001°
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 describe the Absolute Instrumental Uncertainty at a 95 % level of confidence (coverage factor k = 2) within one year from calibration. The 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
E: 0.44 °C
L: 0.42 °C
K: 0.49 °C
N: 0.57 °C
U: 0.48 °C
T: 0.53 °C
M: 0.48 °C
0 °C to 250 °C R: 1.92 °C
D: 1.12 °C
S: 1.88 °C
G/W: 3.34 °C
C: 0.84 °C
mA range 0 mA to 22 mA 0.02 % + 0.002 mA
Loop power 24 V dc ± 6 V
Model Name Description
6109A Portable Calibration Bath, 35 °C to 250 °C
6109A-P Portable Calibration with Process Electronics, 35 °C to 250 °C
7109A Portable Calibration Bath, -25 °C to 140 °C
7109A-P Portable Calibration Bath with Process Electronics, -25 °C to 140 °C

Accessories common to all models:

Accessory Description
7109-2013-1 Stainless Steel Transport Cover
7109-2013-2 Stainless Steel Probe Access Cover
7109-2027 Adjustable Probe Holding Fixture
7109-2051 Single Probe Clamp Kit
7109-2080 Fluid Overflow Kit  (Recommended)
7109-CASE Carrying Case
5012-3.8L Silicone Oil Type 200.10, 3.8 liters (1 gal)
5014-3.8L Silicone Oil Type 200.50, 3.8 liters (1 gal)


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