detcon inc. Detcon MicroSafe™ TP-524C Hydrogen Sulfide Sensor This manual covers the following ranges: 0-20 PPM, 0-50 PPM, and 0-100 PPM Operator’s Installation & Instruction Manual May 09, 2012 • Document #2297 • Version 2.
Table of Contents 3.0 Description 3.1 Principle of Operation 3.2 Application 3.3 Specifications 3.4 Operating Software 3.5 Installation 3.6 Start-up 3.7 Calibration 3.8 Status of Programming: Software Version, Calibration Level, Heater Voltage, Range, and Sensor Life 3.9 Program Features 3.10 Display Contrast Adjust 3.11 Trouble Shooting Guide 3.12 Spare Parts List 3.13 Warranty 3.14 Service Policy 3.15 Software Flow Chart 3.16 Revision Log Detcon Model TP-524C Hydrogen Sulfide Sensor PG.
.0 DESCRIPTION Detcon MicroSafe™ Model TP-524C, hydrogen sulfide sensors are non-intrusive “Smart” sensors designed to detect and monitor H2S in air. Ranges of detection are 0-20 ppm, 0-50 ppm, and 0-100 ppm. 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. The sensor features LED indicators for FAULT and CAL status and is equipped with a standard analog 4-20 mA output.
3.0.2 Microprocessor Control Circuit The control circuit is microprocessor based and is packaged as a plug-in field replaceable module, facilitating easy replacement and minimum down time. Circuit functions include a basic sensor pre-amplifier, sensor temperature control, on-board power supplies, microprocessor, back lit alpha numeric display, fault and calibration status LED indicators, magnetic programming switches, and a linear 4-20 mA DC output.
The sensors are packaged in a cast metal explosion proof enclosure. The enclosure is fitted with a threaded cover that has a glass lens window. Magnetic program switches located behind the transmitter module face plate are activated through the lens window via a hand-held magnetic programming tool allowing non-intrusive operator interface with the sensor. Calibration can be accomplished without removing the cover or declassifying the area.
3.3 SPECIFICATIONS Method of Detection Solid state metal oxide diffusion/adsorption Electrical Classification CSA-NRTL (US OSHA) approved Class I; Groups B, C, D; Div. 1.
Calibration mode allows for sensor span adjustments. Unless otherwise specified, span adjustment is performed at 10 ppm H2S in air for the range 0-20 ppm, and 25 ppm H2S in air for the ranges 0-50 ppm and 0-100 ppm. “AUTO SPAN” 3.4.3 Program Mode The program mode provides a program status menu (View Program Status) to check operational parameters. It also allows for the adjustment of the calibration gas level setting, the heater voltage level, range, and linearity correction. 3.4.3.
3.5.2 Sensor Location Selection of sensor location is critical to the overall safe performance of the product.
Maintenance Access Consideration should be given to easy access by maintenance personnel as well as the consequences of close proximity to contaminants that may foul the sensor prematurely. Note: In all installations, the sensor element in SS housing points down relative to grade (Fig. 1). Improper sensor orientation may result in false reading and permanent sensor damage. 3.5.3 Local Electrical Codes Sensor and transmitter assemblies should be installed in accordance with all local electrical codes.
cult to access. Such a location creates problems for maintenance and calibration activities. Detcon provides the TP524C sensor in a remote-mount configuration in which the sensor (Model TP-524C-RS) and the transmitter (Model TP-524C-RT) are provided in their own condulet housing and are interfaced together with a four conductor cable. Reference figure 4 for wiring diagram.
3.6.2 Remote Mount Heater Voltage Setup If the sensor has been installed using the remote mounting configuration as described in section 3.5.6, the sensor heater voltage must be adjusted after initial power up. Replacement of the sensor will also require readjusting the heater voltage. Follow the steps below to set the sensor heater voltage. Material Requirements * Detcon PN 3270 MicroSafe™ Programming Magnet * Digital volt/ohm meter. Note: Refer to section 3.6.
A magnetic programming tool (see figure 5) is used to operate the switches. Switch action is defined as momentary contact, 3 second hold, and 15 second hold. In momentary contact use, the programming magnet is waved over a switch location. In 3 second hold, the programming magnet is held in place over a switch location for 3 or more seconds. In 15 second hold, the programming magnet is held in place over a switch location for 15 or more seconds.
The “Set X Value” menu is used for adjustments of the linearization coefficient. This is a factory authorized adjustment. The default setting is “6.0”. The “Select Filter” menu is used for adjusting the filter mode , of which, there are three modes. The correct and default setting is “2”. This is a factory authorized adjustment. 3.7 CALIBRATION NOTE: Before calibration, verify the range setting as described in section 3.6.4.
f) Enter the calibration span menu by holding the programming magnet stationary over “PGM 1” for 3 seconds The display will read “1-SPAN 2-EXIT” Hold PGM 1 for 3 seconds to proceed with a span or hold PGM 2 for 3 seconds to exit back to normal operation mode. After choosing span you may, within 1 minute, abort the span procedure by a 3 second hold on PGM 2.
The following procedure is used to view the programming status of the sensor: a) First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for 15 seconds until the display reads “VIEW PROG STATUS”, then withdraw the magnet. At this point you can scroll through the programming menu by momentarily waving the programming magnet over “PGM 1” or “PGM 2”. The menu options are: View Program Status, Set Cal Level, Set Heater Volts, Set Range, and Linearize Sensor.
System Fault If the detector has an irrecoverable calculation error, the display will indicate: “SYSTEM FAULT”. Memory Fault If new data points cannot successfully be stored to memory the display will indicate: “MEMORY FAULT”. Fail-Safe/Fault Supervision Model TP-524C MicroSafe™ sensors are programmed for Fail-Safe operation.
Poor calibration Repeatability 1. Check for adequate Sensor Life. 2. Check Heater Voltage Setting (should be 5.25 V). 3. Use humidifier filled with Distilled Water or inline humidifying tube. 4. Check validity of cal gas (must be H2S in air background). 5. Check for obstructions through s/s sinter element (including being wet). 6. Check sensor lot # and report to Detcon. 7. Check area for presence of reducing gases such as Cl2 and ozone which may cause low readings.
Figure #8 Programming Magnet Enclosure glass lens cover Plug-in control circuit Rain Shield Spash Guard Calibration Adapter Connector Board Enclosure less cover H2S Sensor in Housing Condensation Prevention Packet (replace annually) 3.13 WARRANTY Detcon, Inc.
3.15 SOFTWARE FLOW CHART AUTO SPAN PGM1 (3) NORMAL OPERATION PGM2 (30) VIEW PROG STATUS SET CAL LEVEL SET HEATER VOLTS SET RANGE UTILITY MENU PGM1 (3) PGM2 (M) PGM1 (3) PGM2 (M) PGM1 (3) PGM2 (M) PGM1 (3) PGM2 (M) PGM1 (10) PGM2 (3) PGM2 (3) PGM2 (3) PGM2 (3) PGM2 (3) GAS RANGE V#.
Detcon Model TP-524C Hydrogen Sulfide Sensor PG.
