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Fluke 6109A/7109A Portable Calibration Baths


The Fluke Calibration 6109A and 7109A Portable Calibration Baths are liquid baths that let process industry professionals calibrate four times more sanitary sensors per batch in less time and with twice the accuracy of other portable baths in this class. Larger than micro baths, up to four tri-clamp sanitary sensors fit easily into these baths for 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.

I own a Fluke Calibration Micro-Bath. Why do I need a 6109A or 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 ruined product. 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 clean room use.



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)
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 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 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 Consist of Price

Portable Calibration Bath, 35 °C to 250 °C

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Portable Calibration with Process Electronics, 35 °C to 250 °C

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Portable Calibration Bath, -25 °C to 140 °C

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Portable Calibration Bath with Process Electronics, -25 °C to 140 °C

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Model Name Consist of Price

Stainless Steel Transport Cover 

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Stainless Steel Probe Access Cover 

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Adjustable Probe Holding Fixture 

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Single Probe Clamp Kit

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Fluid Overflow Kit 

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Carrying Case 

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Silicone Oil Type 200.10, 3.8 liters (1 gal)

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Silicone Oil Type 200.50, 3.8 liters (1 gal)

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