Extech RH520

Humidity and Temperature Chart Recorder
Best value paperless chart recorder in the market that's easy to set up and operate
  • Simultaneous numerical and graphical display of Humidity and Temperature readings, plus Time and Date
  • Measures Humidity (10 to 95%RH) and Temperature (-20.0°F to 140.0°F) plus calculates Dew Point
  • Large dual graphical LCD displays with adjustable vertical and horizontal TAC resolution
  • Internal memory records up to 49,000 data points and can be transferred to a PC via RS-232 serial port for further data analysis
  • LCD indicates percentage of memory remaining
  • Replaceable probe does not require recalibration
  • Detachable probe extends up to 1 meter for measurements in closed environments
  • Audible and visual alarm with Hi/Low set points
  • Download, analyze, and store data using Windows®95/98/2000/NT/ME/XP Compatible Software (included)
  • Output socket used with optional external alarm module
  • Scroll the cursor to display selected data recorded
  • Desk or wall mount
  • Complete with built-in stand, detachable probe with 3ft (1m) cable, RS232 cable, software, 110VACadaptor and 3 AA batteries
  • Monitor and record Laboratory or clean Room temperature and humidity history
  • Record process conditions
  • Generate warning when conditions are outside required limits
  • Monitor controlled environment areas such as freezers, storage areas and other critical areas
  • Store humidity and temperature historical data for report generation

Memmert Universal oven Model UNB 400

Standard equipment

Ventilation and Control
  • natural convection
  • continuous adjustment of pre-heated fresh air admixture
  • vent connection with restrictor flap
  • microprocessor PID-temperature controller with integrated autodiagnostic system with fault indicator
  • one Pt100 sensor class A in 4-wire-circuit
  • integrated digital timer (1 min. up to 99 h 59 min) to switch off heating to stand-by mode
  • digital LED- display of set and actual temperature as well as remaining process time
  • resolution of display for set value and actual value 0,5 °C

Overtemperature protection (double)
  • in case of total breakdown of sensor, the heating is switched off at approx. 10 °C above set value
  • in case of failure of the switching element, the heating will be controlled by an additional relay approx. 10 °C above the set temperature
  • in case of a faulty sensor (incorrect measuring values) or the total breakdown of the controller the heating is switched off at approx. 10 °C above the max. oven temperature by the mechanical temperature limiter TB protection class 1
  • for very sensitive and/or valuable load in terms of being non-reproducable, we recommend ovens of our E- and P-class guaranteeing an even higher safety standard

Textured Stainless Steel Casing
  • w x h x d: 550 x 680 x 480 mm
  • fully insulated stainless steel door with double locking and 4-point adjustment
  • rear zinc-plated steel

Interior - Heating Concept
  • w x h x d: 400 x 400 x 330 mm, 53 l
  • easy-to-clean interior, made of stainless steel, reinforced by deep drawn ribbing with integrated and protected large-area heating on four sides
  • 2 perforated stainless steel shelves, non-tipping

Temperature Range
  • from +30 °C (however, at least 5 °C above ambient) up to +220 °C

Voltage / Power Rating
  • 230 V (+/- 10%), 50/60 Hz
  • ca. 1.400 W (during heating)

Packing Data
  • net weight approx. 35 kg
  • gross weight carton approx. 45 kg
  • gross weight wooden case approx. 52 kg
  • dimensions approx.: carton w x h x d: 67 x 78 x 63 cm, wooden case w x h x d: 71 x 77 x 59 cm
  • the appliances must be transported upright

Country of Origin
  • Federal Republic of Germany


Perforated stainless steel shelf, non-tipping