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--- atmos:citation:instruments:model_137_hygrometer [2008/05/22 20:57] – external edit 127.0.0.1
+++ atmos:citation:instruments:model_137_hygrometer [2020/01/29 17:25] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Model 137 Aircraft Hygrometer ======
+  * Description: Dew Point Hygrometer
+  * Manufacturer: EdgeTech
+  * Model: 137 -A3
+  * Serial Number: 36278
+===== Configuration =====
+==== April 21, 2010 ====
+The temperature range configuration was changed from -60 C - 40 C, to -70 C to -30 C.  The serial output frequency was changed from 5 seconds to 1 second.
+===== Specifications =====
+  * Dew/Frost Point Range
+    *−50 to +90 °C
+  * Dew/Frost Point Accuracy
+    *±0.20 °C nominal
+  * Depression
+    *65°C,nominal
+  * Slew Rate
+    *1.5°C/second max, above 0°C
+  * Repeatability
+    *± 0.05°C
+  * Precision
+    *0.1 °C
+  * Sample Flow Rate
+    *0.25 - 2.5 liters/minute
+  * Operating Temperature
+    *Control Unit: 0 to + 50°C
+    *Sensor: 50 to +100°C
+  * Power Requirements
+    *90 to 240 VAC, 50 - 60Hz
+    *75 watts Maximum
+===== Pictures =====
+Picture of Control Unit Side
+{{atmos:citation:instruments:model_137_hygrometer:pic_002.jpg?350x350}}
+Control Unit Back
+{{atmos:citation:instruments:model_137_hygrometer:pic_003.jpg?350x350}}
+Control Unit Face
+{{atmos:citation:instruments:model_137_hygrometer:pic_004.jpg?350x350}}
+Sensor Head
+{{atmos:citation:instruments:model_137_hygrometer:pic_005.jpg?350x350}}
+Data Cable
+{{atmos:citation:instruments:model_137_hygrometer:pic_008.jpg?350x350}}
+Sensor Element
+{{atmos:citation:instruments:model_137_hygrometer:pic_009.jpg?350x350}}