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The EMD Series
- Specifications
Resistive Relative Humidity Sensors
| |
EMD-2000 |
EMD-3000 |
EMD-4000 |
Operating
Ranges |
|
Humidity |
25%
to 99% RH |
20%
to 99% (100% RH intermittent) |
|
Temperature |
-40°
C to 85° C |
|
Measurement Accuracy |
1%,
2%, 3% and 5% |
3%
and 5%
|
|
Measurement Frequency |
100 Hz to 10 kHz,
40% to 80% RH |
50
Hz to 1 kHz |
| Average
Temperature Coefficient |
0.5%
RH/C |
| Hysteresis |
5% |
3% |
2% |
| Long
Term Stability (typical drift per year) |
1% |
|
|
Time Response
(63% step change) |
<1
min. |
| |
| |
| Suggested
Drive Voltage |
1
VAC, peak to peak, sine or square wave recommended
at 5,000 to 10,000 Hz |
1
VAC, 0.5 VAC preferred |
| |
| |
| Dimensions |
.50/.30/.025 |
.40/.20/.025 |
| |
| |
|
Chemical |
Ammonia |
Methanol |
Oil |
Acetone |
Hexane |
Formalin |
|
Condition |
100% |
15000 ppm |
1% RH |
1000 ppm |
1000 ppm |
1000 ppm |
|
%RH Drift |
0% RH |
1% RH |
<1% RH |
0% RH |
<1% RH |
@25°C<1%RH |
| |
|
|
|
Test |
Condition |
Sensor
Calibration
Shift at 50% RH |
| Cyclic
Aging (Room Temp.) |
100
cycles 25°C
0 to 100% RH and back |
1%
RH |
| High
Temperature Test |
160°C
for 20 hrs. |
1%
RH |
Saturated
Condition
(Room Temperature) |
7
weeks @ 100% RH, 25°C |
2%
RH |
Saturation
Condition
(Elevated Temperature) |
24
hrs. @ 100% RH, 60°C |
2%
RH |
Saturated
Condition
(Low Temperature) |
5
days @ 100% RH, 5°C |
1%
RH |
Saturated
Condition
(Below Freezing) |
5
days @ 100% RH, -7°C |
1%
RH |
| Methanol
Vapor |
15,000
ppm @ 22.5°C |
1%
RH |
| Carbon
Tetrachloride Vapor |
15,000
ppm @ 22.5°C |
0%
RH |
| Corn
Oil |
Immersion
2 min. @ 25°C |
1%
RH |
| Water |
Immersion
2 min. @ 25°C |
4%
RH |
|
Long Term Aging
(Room Conditions) |
3
years (and continuing) |
2%
RH |
| Ammonia |
100%
@ 25°C |
1%
RH |
| |
|
|
|
Test |
Condition |
EMD-4000 |
| Water
resistance |
Immersion
in water for 3 minutes @25C |
<5%RH |
| Condensation
resistance |
1000
hrs @ 100%RH/25C continuous |
<3%RH |
| Condensation
resistance |
1000/
30 min. cycles of condensation at room temperature |
|
| High
temperature |
1000
hrs 80C |
|
| |
1000
hrs @85C |
<1%RH |
| Low
temperature |
1000
hrs @ -40C |
<1%RH |
| |
1000
hrs @ -20C |
|
| Humid/hot
under power |
2200
hrs @ 96%RH/45C |
<5%RH |
| |
1000hrs
@ 99%RH/60C |
|
| Gasoline
vapors |
152,000
ppm @25C |
<3%RH |
|
Toluene vapors |
25,200
ppm @ 25C |
<3%RH |
| Methanol |
127,000
ppm @ 25C |
5%RH
max |
| |
|
|
|
RH |
25C |
45C |
5C |
15C |
35C |
20 |
7810000 |
2150000 |
|
35000000 |
4000000 |
30 |
1650000 |
585000 |
15500000 |
5000000 |
1000000 |
50 |
67330 |
24500 |
372000 |
170000 |
44000 |
70 |
6130 |
2920 |
19500 |
11000 |
4500 |
80 |
|
1390 |
|
|
|
|
90 |
1120 |
693 |
2060 |
1450 |
860 |
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