Additel 835

Portable Calibration Bath

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The ADT835 is a portable calibration bath with a compact bath size of 3.54 x 3.54 inches (90 x 90 mm), setting a new benchmark for powerful, space-saving calibration solutions.

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The ADT835 is a portable calibration bath with a compact bath size of 3.54 x 3.54 inches (90 x 90 mm), setting a new benchmark for powerful, space-saving calibration solutions. Unlike typical integrated dry-liquid baths, the ADT835 delivers exceptional versatility—accommodating temperature sensors of virtually any type, size, or shape. Its innovative design supports both batch and field calibrations with ease, while maintaining excellent stability, uniformity, and accuracy. Combining the precision and reliability of a traditional calibration bath with the portability of a dry well, the ADT835 is a dependable choice for demanding calibration environments.

The ADT835 delivers exceptional performance through a smart, user-focused design. Its advanced data logging capabilities simplify documentation and help minimize errors or missed readings. Built-in application tools enhance workflow efficiency, while intelligent remote control functionality allows for multitasking and increased productivity. The 6.5-inch TFT touchscreen provides an intuitive interface, making operation straightforward—even for first-time users.

• Engineered for exceptional portability and performance
• Extended temperature range: -30°C to 250°C
• High-precision accuracy: ±0.1°C
• Compatible with a wide range of probe types and sizes
• Optional built-in process calibrator
• Quick to temperature
• Delivers outstanding stability and uniformity
• Fast thermal response for efficient operation
• Features advanced dual-zone heating technology
• One touch self-calibration
• Designed with robust electromagnetic interference protection

General Specifications

*Specification*	*Description*
Power requirements	Power supply 110V: 100~120V, 50 Hz/60Hz, fuse: T8A 250V 220V: 200~230V, 50 Hz/60Hz, fuse: T4A 250V Maximum power consumption: 800W
Size and weight	Main structure size: 7.5 × 16.2 × 15.2 in (191(W)×412(H)×387(D)mm) Maximum size: 7.5 × 18.1 × 16.77 in (191(W)×460(H)×426(D)mm) (with handle, overflow tube) Weight: 35.27 Ibs (16 kg) /ADT835-155 and 35.94 Ibs (16.3 kg ) /ADT835PC-155 30.86 Ibs (14 kg )/ADT835-250 and 31.53 Ibs (14.3kg) ADT835PC-250
Environment	Operating temperature: 0°C~ 40°C Guaranteed accuracy: 13°C~ 33°C Storage temperature: -20°C~ 60°C Humidity: 5%RH~95%RH, non-condensing Altitude: ＜ 2000 m IP rating: IP20, indoor use only Vibration: 2g Impact: 5g Package drop test: 1m Warm-up time: 15 min
Working area	Bath size: 90mm*90mm Working area: bath centerφ75mm circular zone, 15mm above bath bottom, 65mm below the fluid level, maximum depth 155mm
Heat transfer fluid	Maximum volume: 2.5L Recommended fluid at 150°C: DOW CORNING XIAMETER PMX-200 10cSt Recommended fluid at 250°C: DOW CORNING XIAMETER PMX-200 50cSt
Communication	USB-A, USB-B, LAN, WIFI, BLE
Electrical functions	Reference RTD channel (EXT.REF) φ4mm banana jacks, 6 PIN Lemo port, quick push wiring DUT channels (CH1, CH2) φ4mm banana jacks, quick push wiring
Display	6.5 in (165 mm) color capacitive touch screen, 640*480, anti-reflective panel, Dark or bright theme switchable Communication update rate: 10 times/s, Display refresh rate: 4 times/s Temperature units: °C, °F, K Highest resolution: 0.001°C, adjustable
Languages	English, Chinese, Japanese, Russian, German, French, Italian, and Spanish
Warranty	1 year

*Temperature* *specification*^[1]
Models	ADT835PC-150 / ADT835-150	ADT835PC-250 / ADT835-250
Range^[2]	-30°C~150°C	33°C~250°C
INT REF accuracy^[3]	± 0.1°C	± 0.1°C
EXT REF accuracy ^[4]	± 0.05°C	± 0.05°C
Stability^[5]	± 0.01°C	± 0.015°C
Uniformity^[6]	± 0.02°C	± 0.03°C (≤200°C) ± 0.04°C ( ＞ 200°C)
Repeatability^[7]	0.04°C (internal reference) 0.01°C (external reference)	0.04°C (internal reference) 0.01°C (external reference)
Heating time^[8]	18 min (-30~23°C) 30 min (23~150°C)	20 min (23~100°C) 35 min (100~250°C)
Cooling time^[8]	45 min (150°C~23°C) 45 min (23°C~-25°C) 55 min (23°C~-30°C)	30 min (250°C~100°C) 45 min (100°C~33°C)
Typical time to stability ^[9]	10 min	10 min

[1] The following temperature specifications are all based on the following conditions:

When the environmental temperature is between 13°C~33°C and the calibration bath is within one year after calibration, the confidence level is 95% (K=2), the bath is not open, the working area is theφ75mm circular zone of the bath center, and it is 15mm above the bath bottom and 65mm below the fluid level. The depth of the fluid should be more than 130mm.

When the environmental temperature exceeds the range of 13°C~33°C, the stability and uniformity specification will be 1.25 times larger.

When the bath is open, the stability and uniformity specification will be 1.25 times larger.

[2] The lower limit of controlling range can vary depending on the environmental temperature.

[3] The internal reference accuracy has taken into account the followingl sources of error including calibration uncertainty, stability, uniformity and repeatability.

[4] The external reference accuracy is available for ADT835PC-150 and ADT835PC-250, the reference probe used is Accumac model AM1730-12-ADT.

[5] Stabilty is defined as half of the difference between the maximum and minimum temperature variations of the heat transfer fluid within the working zone over a 10-minute period after the product has reached full stabilization.

[6] Uniformity is defined as half of the difference between the highest temperature point and the lowest temperature point in the valid working area.

[7] Repeatability mainly considers the hysteresis and short-term stability of the reference sensor.

[8] Heating and cooling times are measured from the start of temperature control to when the setpoint is reached within the internal accuracy error band. Actual times may vary depending on ambient temperature, AC power supply voltage, sensor load, and whether the bath is covered during operation.

[9] The typical time to stability refers to the time taken for the temperature in the bath to reach the stability tolerance after the heating or cooling time ends.

Input Specifications (Process Calibrator [PC] Option)

Electrical specification
Reference RTD channel (EXT. REF)	RTD measure	Range: (0~400)Ω Accuracy: ±1.25mΩ@(0~50)Ω, ±0.0025%RD@(50~400)Ω Resolution: 0.1mΩ Temperature coefficient: ±1ppmF.S/°C@(0~13)°C and (33~50)°C Excitation current: 0.75mA, current reversal Measurement technology: 4-wire, 1S measure cycle Type: Pt25, Pt100 SPRT Standard type: ITS-90, CVD, IEC-751 Wiring methods: Lemo and quick push connector
DUT channels (CH1, CH2)	Current measure	Range: (-30~30) mA Accuracy: ±(0.01%RD+2μA) Resolution: 0.1μA Temperature coefficient: ±5ppm F.S/°C@ (0~13)°C and (33~50)°C Input impedance: <10Ω
	Voltage measure	Range: (-30~30)V, (-12~12)V Accuracy: ±(0.01%RD+0.6mV) Resolution: 0.1mV Temperature coefficient: ±5ppmF.S/°C@ (0~13)°C and (33~50)°C Input impedance: >1MΩ
	Switch measure	Mechanical switch or electrical switch
	Loop power	24 V±10%（with Load), 24 V±1%（no Load), Max 60mA for supply power to temperature transmitter and electronic thermometer
	HART	CH1 supports measure and adjust HART transmitter
	RTD measure	Range: (0~400)Ω and (0~4000)Ω(auto) Accuracy: ±2.0mΩ@(0~25)Ω, ±0.004%RD@(25~400)Ω, ±0.005%RD@(400~4000)Ω (4-wire measure) Resolution: 0.1mΩ Temperature coefficient: ±2ppmF.S/°C@( 0~13)°C and (33~50)°C Excitation current: 0.25mA, current reversal Measurement technology: 2/3/4-wire, 1S measure cycle RTD type: Pt10, Pt25, Pt50, Pt100, Pt200, Pt500, Pt1000, Cu10, Cu50, Cu100, Ni100, Ni120 Wiring methods: Lemo and quick push connector
	TC measure	Signal range: (-75~75)mV Accuracy: ±(0.01%RD+5μV) Temperature coefficient: ±5ppmF.S/°C @(0~13)°C and (33~50)°C TC type: S, R, B, K, N, E, J, T, C, D, G, L, U Cold junction range: 0°C~ 50°C Cold junction accuracy: ±0.2°C

Note: This specification reflects the bath’s accuracy for up to one year following calibration, based on a confidence level of K=2

*Temperature sensor measurement specification*
Channel	Type	Measurement Accuracy
Reference RTD channel (EXT.REF)	PT25	Temp. (°C)	-30	0	50	100	150	200	250
	PT25	Accuracy (°C)	±0.013	±0.013	±0.013	±0.013	±0.013	±0.014	±0.014
	PT100	Temp. (°C)	-30	0	50	100	150	200	250
	PT100	Accuracy (°C)	±0.006	±0.006	±0.008	±0.009	±0.011	±0.012	±0.013
DUT channels (CH1, CH2)	PT100	Temp.(°C)	-30	0	50	100	150	200	250
	PT100	Accuracy (°C)	±0.009	±0.010	±0.012	±0.015	±0.017	±0.019	±0.021
	K-TC	Temp. (°C)	-30	0	50	100	150	200	250
	K-TC	Accuracy (°C)	±0.14	±0.13	±0.13	±0.13	±0.14	±0.15	±0.15
	N-TC	Temp. (°C)	-30	0	50	100	150	200	250
	N-TC	Accuracy (°C)	±0.20	±0.19	±0.19	±0.18	±0.17	±0.17	±0.17
	E-TC	Temp. (°C)	-30	0	50	100	150	200	250
	E-TC	Accuracy (°C)	±0.09	±0.09	±0.08	±0.08	±0.08	±0.09	±0.09
	J-TC	Temp. (°C)	-30	0	50	100	150	200	250
	J-TC	Accuracy (°C)	±0.11	±0.10	±0.10	±0.10	±0.11	±0.11	±0.11
	T-TC	Temp. (°C)	-30	0	50	100	150	200	250
	T-TC	Accuracy (°C)	±0.14	±0.13	±0.12	±0.12	±0.11	±0.11	±0.11

Note 1: The measurement accuracy specification does not include the accuracy of the DUT itself;

Note 2: Thermocouple measurement accuracy is calculated based on the cold junction temperature of 0°C and does not include the error of the CJC sensor.

Models	ADT835PC-150	ADT835-150	ADT835PC-250	ADT835-250
Range	-30°C~150°C	-30°C~150°C	33°C~250°C	33°C~250°C
mA/mV/V	•		•
measure	•		•
Switch measure	•		•
24V loop power	•		•
HART communicator	•		•
Quick push wiring	•		•
INT reference	•	•	•	•
EXT reference	•		•
Self-calibration	•		•
Documenting task	•		•
Step test	•	•	•	•
Thermal calculator	•	•	•	•
Sensor library	•	•	•	•
Snapshot	•	•	•	•
Remote control	•	•	•	•
Smart diagnosis	•	•	•	•
USB stick update	•	•	•	•

Documents:

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Additel 835 Datasheet 2025.6.25 1.7 MB