12
standard Package E utilizes the ETS Model 5461 Desiccant/Pump
Dehumidification System to dry the chamber.
As an option, the ETS Model 5465 Dry Gas Dehumidification System may
be substituted for the Model 5461. This system uses a solenoid valve to
control the flow of dry gas
The Model 5112 can measure relative humidity over the entire 0 to 100%
range, but only controls levels below 55% RH. The standard sensor
supplied with the Controller has a response time satisfactory for
maintaining long-term humidity stability. For applications requiring a fast
recovery time the optional ETS Model 554 Humidity Sensor should be
used.
3.2.1 Description
3.2.1.1 Model 5112 Dehumidifier Controller
The Model 5112 Dehumidifier Controller shown in Figure
3.2-1 consists of two (2) basic components: a Humidity
Sensor and a Control Unit.
Figure 3.2-1: Model 5112 Dehumidifier Controller
The standard Humidity Sensor is an integrated unit
measuring approximately1”Lx.44”Wx.375”D (25x11x10mm)
that plugs into a 24” (61cm) multi-conductor cable that is
hard-wired to the Control unit. Longer cable lengths are
available as an option. A temperature compensated
capacitive sensing element where capacitance is
proportional to humidity is used to detect the relative
humidity level. This type of sensor can measure over the
entire range of 0 to 100% R.H. with accuracy better than
±2% R.H at a temperature of 20-40
°
C. The sensor has a
slew rate (response time) of 0.35% R.H./sec.
