Siemens Maxum II Service Manual

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 3-9 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 Module (TCM) .
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 3-10 Temperature Setpoint Modules Installed on Left Side of Base3 DPM (Temperature Control Module shown,
Base3 DPM similar)
Flame Photometric Detector
3.5 Base3 Detector Personality Module (DPM)
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001 27

Siemens Maxum II Specifications

General

Category	Gas Chromatograph
Measurement Principle	Gas Chromatography
Communication Protocols	Modbus, Ethernet, Profibus
Operating Temperature	-20°C to 55°C
Power Supply	24 VDC or 100-240 VAC
Mounting	rack mount
Applications	Refinery, chemical, petrochemical, natural gas
Detectors	Thermal Conductivity Detector (TCD), Flame Ionization Detector (FID)
Sample Inlets	Multiple
Dimensions	Varies by configuration (e.g., 19" rack mount)