Benchtop Temperature/Humidity Generator

Features
Specifications
Ordering Information
Downloads

2500

Features

Full range accuracy ±0.5% RH
Large working volume for optimal throughput
NIST-developed two-pressure principal
RS-232 interface and ControLog automation software included

Specifications
Relative Humidity Range	10% to 98%
Relative Humidity Resolution	0.02%
Relative Humidity Accuracy	±0.5%
Chamber Temperature Range	–10°C to 70°C
Chamber Temperature Resolution	0.02°
Chamber Temperature Uniformity	±0.1°C
Chamber Temperature Accuracy	0.06°C
Gas Flow Rate Range	5 to 20 slpm
Gas Type	Air or Nitrogen
Heating/Cooling Rate	0.4°C per minute
Interface	RS-232, Software ControLog™ and HumiCalc^® included
Chamber Dimensions	15" x 15" x 12" (381 x 381 x 305 mm)
Power, Chamber	100/120V at 15A, 50/60Hz 200/240v at 8A, 50/60Hz
Power, Compressor	100/120V at 5A, 50/60Hz 200/240V at 2.5A, 50/60Hz
Air Supply	Clean, oil-free, instrument air at 175 psiG and 20 slpm
Calibration	NIST traceable temperature & humidity calibration with certificate & data
Warranty	12-months, parts-and-labor

Tired of outsourcing your humidity calibrations? Why not buy a temperature/humidity generator and calibrate your humidity probes, data loggers, and chart recorders yourself? It’s simple with the 5121 manufactured for Hart by Thunder Scientific. The 5121 is a self-contained generator that measures and controls humidity with high accuracy to ±0.5% and a large working volume of 15" x 15" x 12" (381 x 381 x 305 mm). Not only does it calibrate humidity probes but also entire chart recorders, data-loggers, and hygrometers (if the probe is not detachable, which is often the case).

5121 uses a “two-pressure” generation principal, which was originally developed by NIST and involves saturating a stream of air with water vapor at a known temperature and pressure. Relative humidity of the saturated air can be directly calculated through the following formula:

To generate a known humidity, the 5121 controls the pressure ratio (P_c/P_s), utilizing an enhancement factor ratio (f_s/f_c) and the effective degree of saturation (e_s/e_c).

Humidity generated by this method is only dependant upon precision measurements of temperature and pressure, so the need to use an expensive chilled-mirror hygrometer as a reference is eliminated, reducing the cost of ownership. The 5121 generates RH with an accuracy of 0.5% over the range –10°C to 70°C and 10% RH to 98% RH. Chamber temperature accuracy is an amazing 0.06°C. With this performance, you can calibrate ambient-measuring, temperature-probes!

To assist with your own calibration uncertainty analysis, be sure to visit the Hart website and download a copy of the 5121 series evaluation report that includes the detailed temperature and humidity uncertainty analysis.

How about operating the 5121? It’s so easy you’ll be performing humidity calibrations minutes from switch-on. The generator is supplied as standard with all the equipment you’ll need. Simply connect the generator to a clean, oil-free air supply, fill up the water reservoir, and plug it in; then place your chart recorders, data-loggers, or humidity sensors into the chamber, close the door, and program the desired temperature and humidity through the easy-to-use front panel display. You’ll quickly be at set point and recording your calibration data! The front panel display provides loads of useful information, including chamber humidity and flow rates, as well as the saturation and chamber temperatures and pressures.

2500Soft If you’re looking for improved productivity in your humidity calibrations, try ControLog™ software, which allows you to program a series of humidity and temperature set-points, and automatically steps through the set-points to maintain stable calibration conditions for defined periods of time. What could be easier?

The 5121 series is a favorite with many national labs around the world, all branches of the U.S. military, and most of the major humidity sensor manufacturers.

We use a 5121 at Hart for calibration support of our environmental monitoring systems around our cal labs and in manufacturing. It performs reliably day-in and day-out. In fact, we like our 5121 so much, we wanted to offer one to you. So, if you calibrate humidity systems, visit with Hart and check out the 5121. You’ll be glad you did!

Ordering Information
5121	Humidity Generator, 2500ST (LT)(TPA)

Downloads

Right click one of the following links and “Save Target As ...” to download the desired document in Acrobat (.pdf) format.

Catalog page(s)/data sheet
5121 Maintenance Manual
5121 Uncertainty Analysis

Solving Humidity Calibration Challenges in Today's Metrology Lab (Sensors Magazine reprint)

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