DPM-Based Temperature Control
The Base3 DPM has two temperature-control channels. Two RTD inputs feed two comparator
circuits to drive two heater-control outputs. The heater-control outputs connect to inputs on
the PECM in most analyzers. The control path is shown below.
SYSCON
DPM
SSRbSSRa
AC
Line
Heater
Airflow Loss
Shutdown
Temperature
Control
I
2
C
PWM
Temp
Setpoint
Modules
Temp Control,
Temp Limit,
Overtemp RTDs
Digital
Air Pressure
Switch
SSR Pair
Analog
High-Wattage
Heater
Air Bath Oven
PECM
Airflow
Loss
Shutdown
Compare
Figure 2-30 Heater Control Path Using DPM
A mounting location and connector are provided for two Temperature Setpoint Modules. The
modules are installed on the left side (back) of the DPM, shown below. This same position is
used in the
Temperature Control DPM
.
RTD Temp Control Inputs
I
2
C
Heater Control Outputs to PECM
Location ID Switch
Temp Setpoint Module
Mounting Screw Access
Temp Setpoint Module
Mounting Location
Status
LEDs
Figure 2-31 Temperature Setpoint Modules Installed on Left Side of Base3 DPM
Electronic Compartment Component Descriptions and Maintenance Procedures
2.5 Detector Personality Modules
Maxum II Reference Manual
Manual, 7/2017, 2000596-001 65
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