Temperature Calibration Equipment
01
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Portable Calibration Bath
Additel 835
OVERVIEW
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 workow efciency, 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 rst-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 (PC)
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
02
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Temperature Calibration Equipment
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Versatile Sensor Calibration with the ADT835
Calibrating a wide range of temperature sensors is a challenge, particularly in
industries like pharmaceuticals, biotechnology, and food processing, where
specialized or sanitary sensors are common. These sensors often feature large
anges, ferrule nuts, or short probes, making on-site calibration with traditional
dry wells difficult and costly. Users may need to invest in custom dry wells,
yet still face limitations in achieving accurate results. The ADT835 portable
calibration bath addresses these challenges by providing a stable and uniform
temperature field, ensuring precise calibration for sensors of various types,
sizes, and shapes, without the need for custom solutions.
Enhanced Efficiency for Batch Calibration
Maximizing calibration efciency directly reduces factory downtime. To facilitate
batch calibration, portable temperature sources must accommodate multiple
sensors simultaneously. The ADT835 features a bath size of 90mm x 90mm
with a depth of 155mm, enabling the calibration of multiple sensors in one
operation. This capacity supports the simultaneous calibration of up to four
50mm diameter sanitary temperature sensors or up to forty 6.35mm diameter
rod-type temperature sensors, signicantly improving operational efciency
.
Innovative Dual Heating Technology for Enhanced Stability
Field environments often introduce challenges like power fluctuations from
heavy equipment, inconsistent airflow from industrial fans, and ambient
temperature shifts caused by variable-frequency air conditioning systems.
These factors can significantly impact calibration bath performance and
compromise temperature control stability.
The ADT835 overcomes environmental challenges with its innovative
dual-zone heating technology. An external heating system near the vapor
chamber delivers stable, consistent temperature control, while an internal
heating element immersed in the fluid provides rapid, dynamic response to
disturbances. This advanced design greatly improves resistance to external
interferences, ensuring reliable and accurate performance—even in demanding
eld conditions.
Accelerated Heating and Cooling for Maximum Efficiency
Efficient calibration depends on fast temperature transitions, minimal
stabilization times, and sufficient bath capacity. The ADT835 delivers on all
fronts with advanced variable-speed prediction and non-overshoot control
technology, achieving an accuracy error band of ±0.1°C throughout the heating
and cooling process.
These rapid thermal response times dramatically reduce calibration cycles
compared to traditional calibration baths, signicantly improving throughput and
overall productivity.
Models
ADT835-150
ADT835PC-150
ADT835-250
ADT835PC-250
Heating To 150°C: 30 minutes To 250°C: 55 minutes
Cooling
To -25°C: 45 minutes To 100°C: 30 minutes
To -30°C: 55 minutes To 33°C: 45 minutes
Temperature Calibration Equipment
03
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Optional Integrated Three-Channel High-Precision Process Calibrator
The ADT835 offers an optional built-in three-channel high-precision process
calibrator, designed to streamline eld operations. This feature eliminates the
need to carry multiple devices on-site.
The integrated calibrator combines the functions of a thermometer, multimeter,
24V power supply, and HART handheld communicator, enabling the ADT835
to manage a wide range of calibration tasks effectively.
Each channel is equipped with quick push connectors, allowing for tool-
free, rapid connections regardless of the connector type. Channel 1 serves
as a reference channel, compatible with smart secondary reference PRTs or
user-provided reference thermometers. Channels 2 and 3 are designated for
device under test (DUT) connections, supporting RTDs, thermocouples (TCs),
temperature transmitters, HART temperature transmitters, and temperature
switches.
Remote Control for Parallel Operation
The ADT835 features advanced remote control capabilities to facilitate parallel
operations:
Point-to-Point Mode: Connects to a mobile phone or computer via Bluetooth or
WiFi hotspot, allowing direct operation of the bath from these devices.
Cloud Mode: Connects to the network through WiFi or LAN port, enabling
remote management of multiple calibration baths via mobile phones or
computers in point-to-point mode.
These smart remote control options enhance operational flexibility and
efciency.
Advanced Fluid Protection Design for Ease of Use and Maintenance
The ADT835 incorporates a professional uid protection design to ensure safe
and convenient operation. It features an integrated overow tank and drain port
to manage uid efciently and facilitate easy transport, mitigating environmental
contamination and safety risks. The bath and tank body are constructed from
rust-resistant stainless steel, which is easy to clean and durable, even in the
presence of irritating or corrosive contaminants.
The ADT835 also includes a sealed top cover with a hand-tight screw to
effectively prevent fluid spill during transport and calibration. Additionally, a
protective power switch design minimizes the risk of oil mist accumulation on
power switch contacts, enhancing reliability and reducing failure likelihood. For
user safety, a temperature warning icon appears on the display when the liquid
temperature exceeds 50°C, alerting users to prevent accidental burns. These
features collectively enhance the safety, usability, and maintenance of the
ADT835 calibration bath.
Automated Self-Calibration for Internal Reference Sensor
Periodic calibration is essential for maintaining temperature control accuracy
in calibration baths. Traditional methods involve manually recording and
calculating errors at each calibration point, a process that can be time-
consuming and complex, often taking over an hour.
The ADT835 simplifies this with its automated self-calibration program. This
feature eliminates the need for manual data entry and calculations, streamlining
the calibration process and ensuring accurate temperature control with minimal
user intervention.
04
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Temperature Calibration Equipment
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
SPECIFICATIONS
General Specifications
Models 835-150 835-250
Range at 23
°
C -30 ~ 150 °C 33 ~ 250 °C
Display accuracy ± 0.1 °C ± 0.1 °C
EXT REF accuracy
[1]
± 0.05 °C ± 0.05 °C
Stability
[2][3]
(10 mins) ± 0.01 °C ± 0.015 °C
Uniformity
[2][3]
± 0.02 °C
± 0.03 °C (≤200 °C)
± 0.04 °C (
＞
200 °C)
Repeatability
0.04 °C (internal reference)
0.01 °C (external reference)
0.04 °C (internal reference)
0.01 °C (external reference)
Heating time
18 min (-30 ~ 23 °C)
30 min (23 ~ 150 °C)
20 min (23 ~ 100 °C)
35 min (100 ~ 250 °C)
Cooling time
45 min (150 ~ 23 °C)
45 min (23 ~ -25 °C)
55 min (23 ~ -30 °C)
30 min (250°C ~ 100°C)
45 min (100°C ~ 33°C)
Typical time to stability 10 min
Working area
φ
75mm circular zone of bath center, 15mm above bath bottom & 65mm below the uid level
Maximum media depth: 155 mm
Opening size 90 x 90 mm
Media Recommendation 10cSt DOW CORNING XIAMETER PMX-200 50cSt DOW CORNING XIAMETER PMX-200
Volume Max: 2.5 L
Temperature Units °C, °F, K
Resolution Adjustable, up to 0.001 °C
Display
6.5 in (165 mm) color touch screen, 640*480 pixels, dark or bright theme switchable
Refresh rate: 4 times/s
Warm-up time 15 min
Environment
Operating temperature: 0 ~ 40°C
Guaranteed accuracy: 13 ~ 33°C
Storage temperature: -20 ~ 60°C
Humidity: 5%RH~95%RH, non-condensing
Altitude:
＜
2000 m
Mechanical testing
Vibration: 2g
Impact: 5g
Package drop test: 1 m
Size
7.5 × 16.2 × 15.2 in (191 W × 412 H × 387 D mm)
7.5 × 18.1 × 16.77 in (191 W × 460 H × 426 D mm) with handle, overow tube
Weight
35.27 Ibs (16 kg) for non-PC unit
35.94 Ibs (16.3 kg) for PC unit
30.86 Ibs (14 kg ) for non-PC unit
31.53 Ibs (14.3kg) for PC unit
Power requirements
-110V: 100~120V, 50/60 Hz, fuse: 8A 250V
-220V: 200~230V, 50/60 Hz, fuse: 4A 250V
Maximum power consumption: 800W
IP rating IP20, indoor use only
Communication USB-A, USB-B, LAN, WIFI, BLE
Languages English, Chinese, Japanese, Russian, German, French, Italian, and Spanish
Warranty 1 year
[1] With AM1730-12-ADT.
[2] 1.25 times when the bath operates without bath cover
[3] 1.25 times when the environment temperature is outside 13~33°C
Temperature Calibration Equipment
05
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Input Specifications (Process Calibrator [PC] Option
）
[1]: One year specications, based on a condence level of K=2
Electrical Measurement Specification
[
1]
Reference RTD
channel (EXT.REF)
RTD
measurement
Probe type Pt25, Pt100
Measurement Capability 4-wire
Range 0~400 Ω
Accuracy
± 1.25 mΩ @ (0~50)Ω
± 0.0025%RD @ (50~400)Ω
Resolution 0.1 mΩ
Temperature coefcient ± 1 ppm FS/°C @ (0~13)°C and (33~50)°C
Excitation current 0.75 mA, current reversal
Measurement rate 1 reading/sec
Standard ITS-90, CVD, IEC-751
Connection Lemo connector, quick push connectors, and
φ
4mm banana jacks
DUT channels
(CH1, CH2)
Current
measurement
Range -30~30 mA
Accuracy ± (0.01% RD + 2 μA)
Resolution 0.1μA
Temperature coefcient ± 5 ppm FS/°C @ (0~13)°C and (33~50)°C
Input impedance
< 10 Ω
Voltage
measurement
Range -12~12 V & -30~30 V
Accuracy ± (0.01% RD+0.6 mV)
Resolution 0.1mV
Temperature coefcient ± 5 ppm FS/°C @ (0~13)°C and (33~50)°C
Input impedance > 1 MΩ
RTD
measurement
Probe Type Pt10, Pt25, Pt50, Pt100, Pt200, Pt500, Pt1000, Cu10, Cu50, Cu100, Ni100, Ni120
Measurement Capability 2/3/4-wire
Resistance Range 0~400 Ω and 0~4000 Ω, auto switch
Accuracy
(4-wire)
± 2.0 mΩ @ (0~25)Ω
± 0.004%RD @ (25~400)Ω
± 0.005%RD @ (400~4000)Ω
Resolution 0.1 mΩ
Temperature coefcient ± 2 ppm FS/°C @ (0~13)°C and (33~50)°C
Excitation current 0.25mA, current reversal
Measurement rate 1 reading/sec
TC
measurement
Probe type S, R, B, K, N, E, J, T, C, D, G, L, U
mV range -75~75 mV
Accuracy ± (0.01%RD + 5 μV)
Temperature coefcient ± 5 ppm FS/°C @ (0~13)°C and (33~50)°C
Cold junction range 0 ~ 50 °C
Cold junction accuracy ± 0.2 °C
Loop power
With load accuacy 24 V ± 10%
Without load accuacy 24 V ± 1%
Max 60mA
HART Only available on CH1 channel
Switch
measurement
Mechanical or electrical switch
Connection Quick push connectors, and
φ
4mm banana jacks
06
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Temperature Calibration Equipment
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Temperature Sensor Measurement Accuracy (°C)
[1]
Channel
Temperature
Probe Type
-30 0 50 100 150 200 250
Reference RTD
channel
(EXT.REF)
PT25 ±0.013 ±0.013 ±0.013 ±0.013 ±0.013 ±0.014 ±0.014
PT100 ±0.006 ±0.006 ±0.008 ±0.009 ±0.011 ±0.012 ±0.013
DUT channels
(CH1, CH2)
[2]
PT100 ±0.009 ±0.010 ±0.012 ±0.015 ±0.017 ±0.019 ±0.021
K-TC ±0.14 ±0.13 ±0.13 ±0.13 ±0.14 ±0.15 ±0.15
N-TC ±0.20 ±0.19 ±0.19 ±0.18 ±0.17 ±0.17 ±0.17
E-TC ±0.09 ±0.09 ±0.08 ±0.08 ±0.08 ±0.09 ±0.09
J-TC ±0.11 ±0.10 ±0.10 ±0.10 ±0.11 ±0.11 ±0.11
T-TC ±0.14 ±0.13 ±0.12 ±0.12 ±0.11 ±0.11 ±0.11
[1]: The measurement accuracy specication does not include the accuracy of the probe itself;
[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
• • • •
ADT835 Selection Guide
ADT835 PC Version
ADT835 non-PC Version
Temperature Calibration Equipment
07
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
Optional Accessories
Model Description Picture
9921 Carrying case with wheels
9090
Clamp bracket
(see next page for details)
9091
Circular bracket
(see next page for details)
9092
Sanitary tting xture
(see next page for details)
AM17XX-12-ADT
Straight Secondary reference
PRT (see Additel catalog)
AM17XX-BEND-
ADT
Bend Secondary reference
PRT (see Additel catalog)
9070
Smart connector for reference
PRT
(for modifying user’s own
reference sensor)
9071
Connector Adapter from smart
connector to 4-wire with gold-
plated spades
(for calibrating smart
connector reference sensor)
9072
Smart connector with clamps
for reference PRT
(for connecting to user’s own
reference sensor)
9203-4L
Silicon Oil, 4L
(10 cSt for -150
）
9204-4L
Silicon Oil, 4L
(50 cSt for -250)
Blank access cover Custom holes by users
9093 High volume probe xture
9080
Compensation cable kit
(S, R, K, J, T, E, N)
Ordering Information
Model:
ADT835
ADT835PC
ADT835
Model Number
Temperature Range
(at 23
°C
):
150: -30
°C to 150°C
250: 33
°C to 250°C
150
110 V
Power Option:
110 V
220 V
Accessories
Standard Accessories
Model Quantity Picture
AC power cable
1 pc.
USB cable 1 pc.
Test leads, 1 red 1 black
(only ADT835PC-L-150/
ADT835PC-H-250)
2 set
Top sealing cover 1 pc.
Multiple hole Teon cover 1 pc.
Protection basket
1 pc
Fluid overow box 1 pc.
ISO 17025 accredited
calibration
1 pc.
08
Corporate Headquarters
2900 Saturn Street #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Temperature Calibration Equipment
Phone: 714-998-6899 Email: sales@additel.com
Rev # 20250910
ADT835 Special jigs
No. Item Function Picture
1
9090
Clamp bracket
Quick connect to the M4
thread hole on the bath handle
for clamping single DUT
2
9091
Circular bracket
Quick connect to the M4
thread hole on the bath handle
Constrains multiple DUTs for
batch calibration
3 Protection basket
The mesh thermal protection
basket is quickly installed
in the tank. The sides and
bottom of the basket have
excellent temperature
uniformity, and the DUTs can
contact it at any place
4
Sanitary tting
xture
Allows the ange, nut and
stem of special-shaped DUTs
to be immersed in the liquid
at the appropriate position,
and the height can be
easily adjusted. Suitable for
calibration of multiple sanitary
temperature sensors
5
Multiple hole Teon
cover
The PTFE cover provides
heat insulation. The default
is 9 *
φ
8mm holes, and the
quantity and diameter of holes
can be customized. Suitable
for calibration of precision
temperature sensors
6
High volume probe
xture
Almost 36 pcs temperature
sensors to be calibrated
is placed in a uniform
temperature tube, with no risk
of liquid contamination to the
sensor, and remains clean.
Typical Application of ADT835 Special jigs
No. Application Jigs Picture
1
Open single calibration
for 1 large dial bimetallic
thermometer
9090 Clamp
bracket
2
Open batch calibration for
40 rod type sensors
9091 Circular
bracket
+
Protection basket
3
Open batch calibration for
4 temperature transmitters
or more
9091 Circular
bracket
+
Protection basket
4
Open batch calibration for
4 sanitary sensors of 50
mm diameter
Adjustable multiple
hole jig
5
Closed precision
calibration for 9 precision
sensors
Multiple hole Teon
cover
+
Protection basket
6
Non-open precision
calibration (for calibrating
36 exible temperature
sensors)
High volume probe
xture
Note:
Open calibration is intended for batch calibration of low-precision temperature sensors, large dial low-precision sensors, or temperature transmitters.
Closed calibration is designed for precision temperature sensors or transmitters, featuring insulation to minimize heat loss.
Top sealing cover for avoiding
overowing in movement
Multiple hole teon cover for
easy use and cleaness
Sanitary tting xture for
easily calibrating irregular-
shaped sensors
Protection basket for excellent
temperature uniformity
Unique overow port for
avoiding overowing
Drian port for totally empty in
four minutes
Fluid overow box for easily
inlling and disassembly
Bracket hole for installing
Clamp bracket for calibrating
single sensor
Circular bracket for calibrating
multiple sensors
High volume probe xture for
calibrating 36 pcs sensors