DM-534C Oxygen Sensor Assembly DESCRIPTION Detcon MicroSafe™ Model DM534C, oxygen deficiency sensors are non-intrusive “Smart” sensors designed to detect and monitor O2 in air over the range of 0-25%. One of the primary features of the sensor is its method of automatic calibration which guides the user through each step via instructions displayed on the backlit LCD.
DM-534C Oxygen Sensor Assembly Base Connector Board The base connector board is mounted in the explosion proof enclosure and includes: the mating connector for the control circuit, reverse input and secondary transient suppression, input filter, and lugless terminals for field wiring. Wiring to O2 Sensor Customer...
DM-534C Oxygen Sensor Assembly Figure 4 Explosion proof enclosures PRINCIPLE OF OPERATION Method of detection is by a controlled rate of diffusion. Air and gas diffuse through a sintered stainless steel filter and a diffusion barrier. As oxygen is adsorbed into the electrolyte solution a current is generated between the cathode and anode electrodes.
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.
DM-534C Oxygen Sensor Assembly Table 2 Field wiring Table Meters Feet 1200 2000 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.
DM-534C Oxygen Sensor Assembly Conduit "T" EYS Seal Fitting MODEL DM-534C HOUSTON, TEXAS MicroSafe O2 Gas Sensor Drain ALM ALM Figure 6 Typical Installation Local Electrical Codes Sensor and transmitter assemblies should be installed in accordance with all local electrical codes. Use appropriate conduit seals.
This is usually true in instances where the gas sensor head must be mounted in a location that is difficult to access. Such a location creates problems for maintenance and calibration activities. Detcon provides the DM-534C sensor in a remote-mount configuration in which the sensor (Model DM-534C-RS) and the transmitter (Model DM-534C-RT) are provided in their own condulet housing and are interfaced together with a three conductor cable.
-Detcon PN 943-000006-132 Threaded Calibration Adapter -Detcon PN 942-001123-000 Zero Air cal gas or use ambient air if no combustible gas is present. a) Attach the calibration adapter to the threaded sensor housing. Apply the test gas at a controlled flow rate of 500 ml/m.
-Detcon PN 613-120000-000 Splash Guard with integral Cal Port -OR- -Detcon PN 943-000006-132 Threaded Calibration Adapter -Detcon PN 942-001123-000 Zero Air cal gas or use ambient air if no combustible gas is present. Programming Magnet Operating Instructions Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the transmitter face plate.
DM-534C Oxygen Sensor Assembly Calibration Procedure - Span NOTE 1: Before performing an ambient air O span calibration, be sure there is no oxygen deficient condition present. CAUTION: Verification of the correct calibration gas level setting and calibration span gas concentration is required before “span” calibration. These two numbers must be equal.
DM-534C Oxygen Sensor Assembly Additional Notes 1. Upon entering the calibration menu, the 4-20 mA signal drops to 2 mA and is held at this level until you return to normal operation. 2. If during calibration the sensor circuitry is unable to attain the proper adjustment for span, the sensor will enter into the calibration fault mode and cause the display to alternate between the sensor’s current status reading and the calibration fault screen which appears as: “CAL FAULT”...
“CAL FAULT” Fail-safe/Fault Supervision Detcon MicroSafe™ sensors are programmed for failsafe operation. Any of the following fault condition will illuminate the fault LED, and cause the display to read its corresponding fault condition: “SENSOR FAULT”, or “CAL FAULT”.
Display Contrast Adjust Detcon MicroSafe™ sensors feature a 16-character backlit liquid crystal display. Like most LCDs, character contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in the MicroSafe™...
Detcon, Inc., further provides for a five year fixed fee service policy covering the control circuit wherein any failed part shall be repaired for a fee of $55.00. The fixed fee service policy shall affect any necessary factory repair for the period following the two-year warranty period and shall end five years after expiration of the warranty.
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