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ATI Technologies UniSens A12 Series Manual

2-wire gas transmitter
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2-Wire Gas Transmitter
Home Office
Analytical Technology, Inc.
6 Iron Bridge Drive
Collegeville, PA 19426
Phone: 800-959-0299
610-917-0991
Fax:
610-917-0992
Email: sales@analyticaltechnology.com
Web: www.Analyticaltechnology.com
Fax: 610-917-0992
O & M Manual
UniSens
Fax:
+ 44 (0)1457-874-468
European Office
ATI (UK) Limited
Unit 1 & 2 Gatehead Business Park
Delph New Road, Delph
Saddleworth OL3 5DE
Phone: +44 (0)1457-873-318
Fax:
+ 44 (0)1457-874-468
Email: sales@atiuk.com

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Summary of Contents for ATI Technologies UniSens A12 Series

  • Page 1 O & M Manual UniSens 2-Wire Gas Transmitter Home Office European Office Analytical Technology, Inc. ATI (UK) Limited 6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park Collegeville, PA 19426 Delph New Road, Delph Phone: 800-959-0299 Saddleworth OL3 5DE 610-917-0991 Phone: +44 (0)1457-873-318 Fax:...

  • Page 2: Table Of Contents

    Series A12 Unisens 2-Wire Transmitter TABLE OF CONTENTS INTRODUCTION ..............................3 AUTO-TEST OPTION ..........................4 DUCT MOUNTED SENSORS ........................6 SPECIFICATIONS ..............................7 INSTALLATION ................................8 MECHANICAL MOUNTING ........................8 DUCT MOUNT SENSOR INSTALLATION ...................10 SENSING MODULE REMOVAL ......................11 CHANGING GAS SENSOR TYPE ......................11 ELECTRICAL CONNECTION ..........................12 OPERATION ................................14 START-UP ..............................14 STARTUP DELAY ............................15...

  • Page 3: Introduction

    Series A12 Unisens 2-Wire Transmitter INTRODUCTION UniSens is a two-wire gas transmitter for use in monitoring hazardous gases in ambient air. It is designed to monitor gas concentration in areas around storage cylinders, process piping, or gas feed equipment in virtually any type of industrial plant environment. The name UniSens signifies the fact that this is a Universal Sensor System.

  • Page 4: Auto-Test Option

    Series A12 Unisens 2-Wire Transmitter UniSens transmitters, also designated Series A12, are loop-powered devices capable of operating from DC power supplies between 12 and 30 VDC. Normally, this transmitter will be powered from the 24 VDC supply from a plant wide monitoring computer, a data logger, or an alarm systems that supplies the DC voltage.

  • Page 5: Figure 1 - Unisens Transmitter Components

    Series A12 Unisens 2-Wire Transmitter Figure 1 - UniSens Transmitter Components O & M Manual - 5 - Rev-L, 7/15...

  • Page 6: Duct Mounted Sensors

    Series A12 Unisens 2-Wire Transmitter DUCT MOUNTED SENSORS A special sensor design is available as an option that allows toxic gas sensors to be inserted into a duct or pipe through a special adapter. This system is designed to allow gas monitoring in enclosed spaces with easy removal of the sensor for service.

  • Page 7: Specifications

    Series A12 Unisens 2-Wire Transmitter SPECIFICATIONS The following general specifications refer to the UniSens transmitter. Because each sensing module contains a different sensor, there are specification differences for each gas. Gas Type: Customer selected from available sensor list. Range: Supplied with standard range for each gas unless otherwise specified. Display: 4 1/2 digit LCD Accuracy: Generally ±5% of value, but limited by available calibration gas accuracy.

  • Page 8: Installation

    Series A12 Unisens 2-Wire Transmitter INSTALLATION Installation of a UniSens transmitter requires mechanically mounting the enclosure, grounding the enclosure, and connecting DC power to the system. MECHANICAL MOUNTING Figure 3 shows the dimensions of the transmitter enclosure and the location and size of the electrical conduit connection.

  • Page 9: Figure 4 - Wall Mounting Bracket

    Series A12 Unisens 2-Wire Transmitter The transmitter enclosure can be mechanically supported by the conduit if proper conduit fasteners are used. A mounting bracket is supplied with the transmitter for fastening the transmitter enclosure to a wall or mounting plate. Figure 4 shows the hole center dimension for that mounting bracket.

  • Page 10: Duct Mount Sensor Installation

    Series A12 Unisens 2-Wire Transmitter DUCT MOUNT SENSOR INSTALLATION Duct mounted sensors are designed to be inserted into an air duct or pipe through a special adapter fitting (part number 00-0814). This fitting has a 1” MNPT thread on the front for adapting to the duct or pipe.

  • Page 11: Sensing Module Removal

    Series A12 Unisens 2-Wire Transmitter SENSING MODULE REMOVAL UniSens sensor modules are easily inserted and removed from transmitters to allow bench calibration and simplify field service. To remove the sensor module from the transmitter, be sure that the lock ring is turned fully to the left. From the locked position, the lock ring will turn 1/2 turn.

  • Page 12: Electrical Connection

    Series A12 Unisens 2-Wire Transmitter ELECTRICAL CONNECTION Standard transmitters are supplied with the sensing module connector factory wired to the relay base. The only connections required for installation are the two loop connections and earth ground to the enclosure. Figure 6 shows the proper terminals for loop wiring and the earth ground connection point. The transmitter module can be removed from the outer enclosure by gently rocking it back and forth while pulling out.

  • Page 13: Figure 7 - Remote Electrical Connections

    Series A12 Unisens 2-Wire Transmitter Figure 7 - Remote Electrical Connections O & M Manual - 13 - Rev-L, 7/15...

  • Page 14: Operation

    Series A12 Unisens 2-Wire Transmitter OPERATION After mechanical and electrical installation is complete, the transmitter is ready for operation. Prior to start-up, recheck the loop wiring connection to be sure it's correct. Reversing the loop wiring will not damage the transmitter, but other devices in the loop may be adversely affected. START-UP When power is first applied, the transmitter will go through a start-up sequence.

  • Page 15: Startup Delay

    Series A12 Unisens 2-Wire Transmitter STARTUP DELAY When the start-up sequence is complete, the display will begin to indicate gas concentration and will display the mA lock flag, indicating that a start-up delay is in progress and that the mA output is locked at 4.0 mA (except for oxygen transmitters, where the loop will be locked at 17.4 mA, the equivalent of 20% O 2 ).

  • Page 16: Liquid Crystal Display

    Series A12 Unisens 2-Wire Transmitter LIQUID CRYSTAL DISPLAY The display in the A12 transmitter provides the operator with a real time concentration display and a variety of prompts for selecting transmitter operating modes. Figure 8 shows the display, including all of the special indicators contained in it. Below that Figure is a description of each of the indicators. Figure 9 - Liquid Crystal Display A - Digital Concentration Display B - Zero Indicator, activated while zeroing a sensor module or adjusting the 4 mA output value.

  • Page 17: Menu Sequence

    Series A12 Unisens 2-Wire Transmitter MENU SEQUENCE Operation of the transmitter is accomplished from the front panel using magnetic controls, with the LCD providing visual indication of menu selections. Through menu selections, the user can review information about the transmitter, calibrate the transmitter, manually activate the Auto-Test function (if installed), simulate 4 different mA output values, and reset the transmitter to normal operation in the event of an Auto-Test failure.
  • Page 18 Series A12 Unisens 2-Wire Transmitter O & M Manual - 18 - Rev-L, 7/15...

  • Page 19: Transmitter Mode Selection

    Series A12 Unisens 2-Wire Transmitter TRANSMITTER MODE SELECTION The transmitter provides 4 main mode selections. After the display scrolls through the power-up sequence and completes the start-up delay, it enters the NORMAL mode of operation, displaying gas concentration. By holding a magnet over the MODE control, the display will indicate "InFo". Repeating this process will change the display to "tESt"...

  • Page 20: Analog Output Simulation

    Series A12 Unisens 2-Wire Transmitter When the test sequence is activated, the 4-20 mA output will be locked at the value being transmitted before the sequence began, normally close to 4.0 mA. If you observe the LCD, you will see the gas concentration begin to increase as gas is evolved from the generator. When the display reaches 10% above the start value, a PASS message will flash on the display, indicating that the sensor passed the test.

  • Page 21: Calibration

    Series A12 Unisens 2-Wire Transmitter CALIBRATION UniSens transmitters should be calibrated every 3-6 months. However, the concept of calibration is a little different with this product. Because calibration constants are stored in the sensing module, you are really calibrating the sensing module rather than the transmitter itself. The frequency of calibration is dependent on the operating environment (sensors exposed to dirt, oil mist, or vapors need more frequent calibration) and the degree to which accuracy is important.

  • Page 22: Sensing Module Zero Adjustment

    Series A12 Unisens 2-Wire Transmitter SENSING MODULE ZERO ADJUSTMENT As previously mentioned, adjusting the sensing module zero requires that the sensor be exposed to air that is free of the target gas or any other gases that might cause either negative or positive interference to that sensor.

  • Page 23: Sensing Module Span Adjustment

    Series A12 Unisens 2-Wire Transmitter To zero the transmitter, allow zero air to flow to the sensor for 5 minutes. If the sensor is located in air known to be gas free, follow the steps below to adjust the zero. Step 1 With the LCD indicating normal mode of operation, activate the MODE control repeatedly until the display shows "CAL".

  • Page 24: Calibration Of Duct Mount Sensors

    Series A12 Unisens 2-Wire Transmitter CALIBRATION OF DUCT MOUNT SENSORS The procedure for zeroing and calibration of duct mounted gas sensors is similar to that described on pages 22 and 23 except that the calibration is done with the sensor still mounted inside the mounting adapter fitting.

  • Page 25: Ma Output Adjustment

    Series A12 Unisens 2-Wire Transmitter MA OUTPUT ADJUSTMENT Series A12 transmitters provide a method of adjusting (or offsetting) the 4 and 20 mA output values slightly in order to insure that other devices in the output loop read the correct value. In effect, these adjustments are the equivalent of fine zero and fine span controls.

  • Page 26: Error Messages

    Series A12 Unisens 2-Wire Transmitter ERROR MESSAGES The A12 constantly evaluates the condition of the sensor and the output loop to detect errors that might compromise the performance of the instrument. The following messages will appear on the LCD display if the transmitter detects certain failures. AUTO TEST FAIL : This message is displayed if the transmitter is equipped with the Auto-Test option and the sensor fails to respond to 3 successive tests at one hour increments.
  • Page 27 Series A12 Unisens 2-Wire Transmitter SPARE PARTS Series A12 Two-Wire Gas Transmitter PART NO. DESCRIPTION 03-0071 Transmitter module (no enclosure or relay base) 03-0063 Transmitter x-proof enclosure, base, module connector 03-0111 Transmitter x-proof enclosure, base, module connector with 5 ft. cable 03-0070 Sensing module connector assembly with 8"...
  • Page 28 Series A12 Unisens 2-Wire Transmitter SENSOR ONLY PART NO. DESCRIPTION 00-0264 E10-XX Low Range Oxidant Sensor (F 2 , Br 2 , I 2 , ClO 2 ), under 3 PPM 00-0265 E10-XX High Range Oxidant Sensor (F 2 , Br 2 , I 2 , ClO 2 ), 5 PPM & Above 00-0266 E10-27 Sulfur Dioxide Gas Sensor 00-0267...
  • Page 29 Series A12 Unisens 2-Wire Transmitter INSERTION SENSORS 00-0815 G10-xx Lo Oxidant 00-0816 G10-xx Hi Oxidant 00-0817 G10-15 Ammonia 00-0818 G10-16 Carbon Monoxide 00-0819 G10-18 Hydrogen 00-0820 G10-19 Oxygen 00-0821 G10-20 Phosgene 00-0822 G10-21 Hydrogen Chloride 00-0823 G10-22 Hydrogen Cyanide 00-0824 G10-23 Hydrogen Fluoride 00-0825 G10-24 Hydrogen Sulfide...
  • Page 30 PRODUCT WARRANTY Analytical Technology, Inc. (Manufacturer) warrants to the Customer that if any part(s) of the Manufacturer's products proves to be defective in materials or workmanship within the earlier of 18 months of the date of shipment or 12 months of the date of start-up, such defective parts will be repaired or replaced free of charge.
  • Page 31 WATER QUALITY MONITORS GAS DETECTION PRODUCTS Dissolved Oxygen Ammonia Carbon Monoxide Free Chlorine Hydrogen Combined Chlorine Nitric Oxide Total Chlorine Oxygen Residual Chlorine Dioxide Cl2 Phosgene Potassium Permanganate Bromine Chlorine Dissolved Ozone Chlorine Dioxide pH/ORP Fluorine Conductivity Iodine Hydrogen Peroxide Acid Gases Ethylene Oxide Peracetic Acid...

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