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Brand: Additel
Additel ADT875 Series Dry Well Temperature Calibrator
Description
A portable dry block built for the plant floor
The Additel ADT875 series puts a temperature source, a colour touchscreen and, optionally, a complete documenting process calibrator into one case of 8.6 to 9.9 kg. Three base models split the work: the -155 reaches down to -40 C for cold-chain and refrigeration sensors, the -350 covers most process thermowell work, and the -660 handles furnace, boiler-feed and exhaust sensors. Typical jobs are RTD and thermocouple verification, transmitter loop checks and thermostat or temperature-switch tests.
Because the block is heated and cooled in place, a technician can bring the calibrator to the instrument rather than send sensors to a laboratory, and the dual-zone control keeps the temperature profile along the insert tight enough for short probes.
What the datasheet highlights
- Dual-zone control, and set point control by reference: the block can be driven from the internal sensor or from an external reference PRT.
- Self-calibration of the internal control sensor against an external reference.
- CYOR (Choose Your Own Range) optimisation over a customer-selected span.
- Auto step, ramp, remote control, data logging and a stability indicator on the screen.
- Full HART field communicator on the PC version, with DD files updated periodically.
- Eight interface languages and USB A, USB B, RJ45, Wi-Fi and Bluetooth communication.
Base unit specification by model
| Parameter | Specification |
|---|---|
| Temperature range at 23 C | -155: -40 to 155 C; -350: 33 to 350 C; -660: 33 to 660 C |
| Display accuracy | -155: +/-0.18 C full range; -350: +/-0.2 C full range; -660: +/-0.3 C at 33 C and 420 C, +/-0.5 C at 660 C |
| Stability, 30 min | -155: +/-0.01 C; -350: +/-0.02 C; -660: +/-0.02 C at 33 C, +/-0.03 C at 50 C, +/-0.04 C at 420 and 660 C |
| Axial uniformity at 60 mm | -155: +/-0.07 C; -350: +/-0.04 C at 33 C, +/-0.1 C at 200 C, +/-0.2 C at 350 C; -660: +/-0.05 C at 33 C, +/-0.3 C at 420 C, +/-0.5 C at 660 C |
| Radial uniformity | -155: +/-0.01 C; -350: +/-0.01 C at 33 C to +/-0.02 C at 350 C; -660: +/-0.02 C at 33 C, +/-0.05 C at 420 C, +/-0.1 C at 660 C |
| Hysteresis (display sensor) | 0.025 C, 0.03 C and 0.1 C for the -155, -350 and -660 |
| Immersion depth | 145 mm (-155); 150 mm (-350 and -660) |
| Insert outside diameter | 25.8 mm (-155); 24.8 mm (-350 and -660) |
| Heating time | -155: 5 min from -40 to 23 C, 8 min from 23 to 155 C; -350: 10 min from 33 to 350 C; -660: 15 min from 33 to 660 C |
| Cooling time | -155: 28 min from 155 to -40 C; -350: 15 min from 350 to 100 C; -660: 23 min from 660 to 100 C |
| Typical time to stability | 10 min |
| Resolution and units | 0.01 C; C, F and K |
| Display | 6.5 in (165 mm) colour touchscreen |
| Size and weight | 320 x 170 x 330 mm; 9.9 kg (-155), 8.6 kg (-350 and -660) |
| Power | 90 to 254 VAC, 45 to 65 Hz; 580 W (-155), 1200 W (-350 and -660) |
| Environment | Operation 0 to 50 C, 0 to 90% RH non-condensing, up to 3,000 m; guaranteed accuracy at 8 to 38 C; storage -20 to 60 C |
| Mechanical testing | Vibration 2 g (10 to 500 Hz); impact 4 g three times; drop test 500 mm |
| Warranty | 1 year |
Process calibrator option inputs
| Parameter | Specification |
|---|---|
| Reference PRT readout (100 ohm PRT, probe excluded) | +/-0.009 C at -40 C rising to +/-0.042 C at 660 C |
| Reference resistance range | 0 to 400 ohm; resolution 0.5 mohm |
| Voltage ranges | -12 to 12 V and -30 to 30 V; +/-0.02% RD + 2 mV; input impedance over 1 Mohm |
| Loop supply | 24 V +/-10%, 60 mA maximum |
| Switch test | Mechanical or electrical |
| HART | Read, configure and calibrate HART devices (order the ADT875PC) |
| Documentation | Up to 1,000 tasks, each storing up to 10 results with as-found and as-left data; snapshot screen captures |
Choosing and ordering
Order codes follow ADT875-155-A-110 V: the model range, an insert letter for the bore pattern and the 110 or 220 V supply setting. Pick the lowest range that covers your sensors, because the -155 offers the tightest stability and the -660 the widest span. Specify the PC option if the same case must also read a reference thermometer and test transmitters, and ask for CYOR if all of your work sits in a narrow band. Inserts are sold separately in drilled and blank patterns, so list your probe diameters when you enquire.
Operation and safety from the manual
The manual asks users to run the Dry-out function for more than 2 hours if the calibrator has not been used for over 10 days. A high-temperature symbol appears whenever the block is above 50 C, and neither the probe nor the insert should be touched while the unit is on. Use the supplied insert removal tool, keep the calibrator away from flammable, humid or dusty surroundings, never apply more than 30 V to the PC inputs, and do not clean it with liquid.
Where it is used in the Gulf
Refinery, gas-processing and power-station instrument shops use dry wells to verify RTDs and thermocouples before shutdowns, and HVAC and food-cold-chain contractors use the -40 C range. A rugged portable block also suits field calibration at remote sites where dust and heat make wet baths impractical.
Selection and installation notes
A dry well gives good results only when the probe fits the insert closely and has enough immersion depth. Select inserts with the right bore for the sensors you calibrate, let the block stabilise at each set point, place the unit on a stable heat-resistant surface with room around it for ventilation and let it cool before it is moved. Follow the manual for the highest and lowest temperatures and the safe handling of hot inserts.
Information needed for a quotation
Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.
Documents and supply information
The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.
Accessories and related items
- Carry case 9915-875, replacement inserts and the insert removal tool.
- Secondary PRT probes (AM17xx series), connectors 9070, 9071 and 9072, cable kit 9080 and a short probe kit.
More instruments are listed under temperature calibration equipment. Send the range, probe sizes and option list and we will prepare a quotation; confirm the exact code before ordering.
Datasheets & Documents
- Datasheet Additel 875 series dry well calibrators datasheet Download
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About brand
Additel designs portable pressure and temperature calibration equipment, from documenting process calibrators and automatic pressure controllers to digital pressure gauges, hydraulic pumps and dry well calibrators. The company is headquartered in Brea, California, USA.
Seven Star LLC is an independent supplier in Muscat. We list Additel instruments with their official datasheets for instrument and calibration teams in oil and gas, power, water and manufacturing in Oman and the GCC.
Additel product series
Pressure calibration equipment includes the ADT760A and 760S automatic handheld pressure calibrators, the ADT761A portable automatic calibrator, the ADT762 automated hydraulic calibrator and the ADT927 hydraulic test pump for 700 bar. Digital pressure gauges include the ADT681A wireless gauge with accuracy up to 0.01% of full scale and the ADT601Ex intrinsically safe gauge.
The ADT226 is a multifunction documenting process calibrator, and the ADT295 communicates with HART, Foundation Fieldbus and Profibus PA devices. Temperature calibration is covered by the ADT875 dry well calibrators and the ADT878 reference dry well calibrators.
Where Additel instruments are used
Field calibration of pressure and temperature transmitters, gauges, switches and RTDs, loop checks and documented calibration for quality audits, and calibration labs in plants and service companies.
Ordering Additel instruments: what we need
Send the model and pressure range, the medium (gas, oil or water), accuracy class and whether results must be documented. For dry wells give the temperature range, stability and insert size. We confirm the exact model code before ordering.
Browse Additel products by category: Portable Test & Measurement, Pressure Instrumentation.
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Frequently Asked Questions
Which temperature ranges does the ADT875 series cover?
Three base models: ADT875-155 from -40 to 155 C, ADT875-350 from 33 to 350 C and ADT875-660 from 33 to 660 C, all quoted at 23 C ambient.
What does the process calibrator option add?
The PC option adds a reference PRT readout, two device-under-test channels for mA, voltage, switch, RTD or thermocouple, a 24 V loop supply, a HART communicator and documentation of up to 1,000 tasks.
What is the CYOR option?
Choose Your Own Range: you state the upper and lower temperature you need within the model range and Additel calibrates and optimizes the dry well over that span.
How is the internal control sensor kept accurate?
A self-calibration function runs an automated calibration of the internal control sensor against your external reference, so long-term drift does not have to be added to the uncertainty.
What safety steps does the manual give for storage and use?
Run the Dry-out function for more than 2 hours if the unit has been idle for over 10 days, do not touch the insert or probe while hot, and never exceed 30 V on the PC inputs.
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