Veris HS Installation Instructions
HS
VERIS INDUSTRIES
Replaceable Humidity Element
Provides Easy Field Replacement
For Veris Deluxe Humidity Sensors
DESCRIPTION
The HS replaceable humidity element is designed to lower costs and reduce
downtime. It features thin-lm capacitive technology for superior accuracy and
exceptional resistance to contaminants. It is compatible with all Veris deluxe
sensors, making replacement quick and easy. No need to install a new humidity
sensing device, just insert a new element into the unit and resume operation.
These humidity elements are calibrated in a high accuracy, NIST traceable,
humidity generator. Each sensor is digitally calibrated at four dierent relative
humidity levels over an eight-hour period. Calibration data is programmed into
the replaceable sensing element. This computer-controlled digital calibration
eliminates errors associated with manual “trimming.” A certicate of calibration is
provided with the device.
Veris’ calibration system produces known humidity values using the fundamental
principle of the “two pressure” generator developed by NIST (H-4622). The
two-pressure method involves saturating air with water vapor at a given pressure
and temperature. Saturated gas then ows through an expansion valve where it is
isothermally reduced to chamber pressure. Gas temperature is held constant during
HUMIDITY
pressure reduction, so relative humidity at chamber pressure is calculated as the
ratio of two absolute pressures.
HS
ORDERING INFORMATION
Accuracy NIST
HS X
1 = 1%*
2 = 2%
3 = 3%
5 = 5%
HS 5 X X
N = NIST (1% and
2% models only)
X = None (2%,
3%, and 5%
models only)
Exam ple:
Conformal Coating
= None
* 1% HS sensors used in outdoor a pplications
are limited by the dev ice to 2% accuracy.
Thin-lm ca pacitive technology
provides superior accuracy and
resistance to contaminants
U.S. Patent No. 5,844,138
Yea r
1
Warranty
Temperature uniformity in the chamber is maintained by circulating a temperature
controlled uid through a shell surrounding the test space. Highly accurate pressure
measurements are made using NIST traceable piezoresistive transducers. The
resulting system accuracy is better than 0.5% RH over all ranges and temperatures.
This system is capable of continuously supplying accurate humidity values for
instrument calibration, evaluation, and verication.
800.354.8556
+1 503.598.4564
www.veris.com
HQ0001794.B 01131
800.354.8556
HS Digital Humidity Sensor
Serial Number:
This digital sensor has been computer profiled and calibrated at multiple relative humidity levels using standards traceable to
the National Institute of Standards and Technology through test #H-4622.
The humidity standard produces an atmosphere of known humidity based on the "two-pressure" principal which is to saturate
an air stream with water vapor at a given pressure and temperature. The saturated air stream is then reduced to test pressure.
The humidity at test pressure is then the ratio of the two absolute pressures, corrected for vapor pressure and enhancement
factor ratios.
Date: Accepted by:
Certificate of Performance
HOURS
2
4
6
0%
-3%
10% 30% 50% 70% 90%
-2%
-1%
0%
+1%
+2%
+3%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Sample interval: 3 minutes
Reference
12.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
Reading
12.53%
20.44%
29.94%
40.12%
49.80%
59.98%
69.84%
79.43%
88.80%
Difference
+0.53%
+0.44%
+0.06%
+0.12%
+0.20%
-0.02%
-0.16%
-0.57%
-1.20%
+1 503.598.4564
www.veris.com
HUMIDITY
HQ0001794.B 01131
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