NIST Traceable Calibrated thermo-hydrograph

(Temperature & Humidity recorder)

This recorder is ideal for accurate measurement of temperature and humidity. Microprocessor based electronic sensors and pen actuators assure an accurate and robust unit able to withstand shock and vibration.  COBEX brand.

Applications:

•  Clean Rooms

•  Paper Storage

•  Warehouses

•  Offices

•  Laboratories

• Hospitals

Features:

•  Microprocessor Based

• Rugged / durable construction

•  Battery back-up available

• 1 or 2 SPDT relay contacts

•  6" diameter chart

•  110V/220V, 50/60Hz standard

•  Case may be surface or flush mounted

•  Highly accurate

• Fast response time

• Simple push-button calibration

•  Chart hold down tabs prevent curling of chart paper

• Remote electronic humidity and temperature sensors

•  Designed and manufactured in the USA

Calibration Information

Calibrations are performed utilizing ICL’s Thunder Scientific model 2500 humidity generator. The NIST-developed two-pressure system of humidity generation on which this unit operates is an intrinsic standard for humidity (see NCSL International’s RISP-5 for more details) which relies upon the NIST traceable calibration of its temperature and pressure sensors to generate humidity values from 10% to 95%RH at temperatures from 0 to 70°C with system uncertainties approaching +/- 0.50% RH (k=2).

Skilled, factory trained calibration personnel subject the client’s instrument to a three (humidity) point test, typically 20, 50 & 80%RH at a specified temperature (normally 23C), with a minimum equilibration time of two hours at each value, with the sensor(s) exposed to a moving air stream of controlled humidity and temperature at a velocity of 20 liters per minute.  The results of the testing (AS FOUND data) are evaluated for compliance with required tolerances.  If needed, adjustments are performed to optimize the device’s indications and the testing is repeated to obtain the AS LEFT data.

A multi-page calibration report is issued which includes all ISO 9000 and ISO 17025 required information, including procedure followed, AS FOUND readings, adjustments made, if any, AS LEFT readings, an uncertainty statement, and all NIST traceability information.  Graphs and charts (if applicable for the device tested) and printout(s) of test parameters during the test(s) are included as supporting documentation.

Specifications

Humidity Accuracy: +/- 5% (20-80%)

Temperature Accuracy:  +/- 1.0 º C (1.8 º F)

Standard Range:  0 to 100 º (F or C selectable) 0 to 100% Relative Humidity
Chart Rotation Speed: 7 day or 24 hour (please specify)

Ambient Operating Conditions: 0 º to +40 º C, 0-95% RH, Non-condensing Relay Contacts:1 Amp @ 120 VAC

Pen type:  Red and Blue Fiber Tipped  (Red = Temp, Blue = Humidity)

Battery Backup:  One 9 Volt Alkaline Battery

Battery Backup Life:  Minimum 24 hours

Range 0-100% RH and 0/100F or C (user selectable), 7-day chart rotation.  Supplied with NIST traceable, ISO/IEC 17025 certificate of calibration.

Range 0-100% RH and 0/100F or C (user selectable), 24-hour chart rotation. Supplied with NIST traceable, ISO/IEC 17025 certificate of calibration.