Product Overview

Dimensions
See the following figure for Humidity Device dimensions.
Figure 3: HL-69158NP dimensions, in. (mm)
Applications
Proportional override device
About this task: When you use the HL-69158NP device
as a proportional override device with a system controller,
the HL-69158NP operates as follows:
1. The HL-69158NP accepts a 0 to 10 VDC or 0 to 20 mA
input from a system controller. See Figure 4.
2. The HL-69158NP calculates an internal 0 to 10 VDC (0
to 20 mA) signal, which is a function of the following:
a. The setpoint or maximum humidity allowed in
the supply air duct; user adjustable from 60%
RH to 95% RH
b. The proportional band or the range of
humidity below the setpoint over which the
control signal is modified; user adjustable
from 5% RH to 30% RH
c. The sensed humidity in the duct
3. The HL-69158NP compares the two signals from Step
1 and Step 2, and outputs the lower of the two signals
to the humidification equipment.
Figure 4: HL-69158NP internal calculation and output
selection
Callout Description
1
0 VDC to 10 VDC or 0 mA to 20 mA input
from the System Controller
2 HL-69158NP’s internal signal
3 Output to the humidification equipment
A Setpoint
B Proportional band
Example: If the setpoint is 90% RH, the proportional band
is 20% RH, the duct humidity is 80% RH, and the controller
input is 7 VDC, the HL-69158NP outputs 5 VDC to the
humidification equipment since 5 VDC is lower than the
system controller’s signal.
Important: You cannot use the relay output when
you use an analog input signal.
HL-69158NP Multi-Function Humidity Device with Temperature Sensor Product Bulletin2