Detcon DM-534C - Manual (Page 9)

DM-534C Oxygen Sensor Assembly
DM-534C O2 Sensor Instruction Manual Rev. 1.4 Page 5 of 18
5.1 Normal Operation
In normal operation, the display tracks the current status of the sensor and gas concentration and appears as:
“20.9 % O2”" The mA current output corresponds to the monitoring level of 0-25% O2 = 4-20 mA.
5.2 Calibration Mode
Calibration mode allows for sensor zero and span adjustments. “2 - SPAN”
The default span adjustment is set at 20.9% which is the normal atmospheric concentration of O2. Span gas
concentrations other than 20.9 % may be used. Refer to section 8.1 for details “SPAN”
5.3 Program Mode
The program mode provides a program status menu (View Program Status) to check operational parameters
and allows for the selection of the calibration gas level setting.
5.3.1 Program Status
The program status scrolls through a menu that displays:
* The gas type, range of detection and software version number. The menu item appears as: “O2 0-25 Vxxx”
* The calibration gas level setting. The menu item appears as: “CalLevel @ xx.x%”
* The estimated remaining sensor life. The menu item appears as: “SENSOR LIFE 100%”
5.3.2 Calibration Level Adjustment
The Calibration level is adjustable from 15.0% to 25.0% O2. The menu item appears as: “CalLevel @ # #%”.
Factory default setting is 20.9%.
6.0 INSTALLATION
Optimum performance of ambient air/gas sensor devices is directly relative to proper location and installation
practice.
6.1 Field Wiring Table (4-20 mA output)
Detcon MicroSafe™ O2 sensor assemblies require three conductor connection between power supplies and
host electronic controllers. Wiring designators are + (DC), - (DC), and mA (sensor signal). Maximum single
conductor resistance between sensor and controller is 10 ohms. Maximum wire size for termination in the
sensor assembly terminal board is 14 AWG.
Table 2 Field wiring Table
AWG Meters Feet
20 240 800
18 360 1200
16 600 2000
14 900 3000
Note 1: This wiring table is based on stranded tinned copper wire and is designed to serve
as a reference only.
Note 2: Shielded cable may be required in installations where cable trays or conduit runs
include high voltage lines or other sources of induced interference.