OWNER’S MANUAL MicroTOL Series Turbidimeter Catalog No. 24034 (5/10) Rev. 4.8 HF scientific 3170 Metro Parkway Ft. Myers, FL 33916 Phone: 239-337-2116 Fax: 239-332-7643 Toll free: 888-203-7248 E-Mail: HFinfo@Watts.com Website: www.hfscientific.
DECLARATION OF CONFORMITY Application of Council Directive Standards to Which Conformity is Declared: st Product Safety - Tested and passed ETL (tested to UL 61010B-1), 1 Edition, Dated January 24, 2003 - Tested and passed ETLc (tested to CSA C22.2#1010.1-92) - Tested and passed CE to IEC 61010-1: 2001 Edition 2.0 Emissions & Immunity – Tested and passed EN61326-1:2006 Manufacturer’s Name: HF scientific, inc.
Table of Contents Section Page Specifications .................................................................................................... 1 1.0 Overview ........................................................................................................... 2 1.1 The Micro TOL Series ......................................................................... 2 1.2 Unpacking and Inspection of the Instrument and Accessories ............. 3 1.3 The Display .........................................
Table of Contents (continued) Section Page 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 Offset Calibration ................................................................................ 20 Enabling the Security Access .............................................................. 21 Extended Settings ................................................................................ 21 Speed of Response...............................................................................
Specifications Measurement Range 0 – 1000.0 NTU 0 – 100 NTU (Model 20055 & 20056) Accuracy ±2% of reading or ±0.02 NTU below 40 NTU whichever is greater ±5% of reading above 40 NTU Resolution 0.
1.0 Overview The MICRO TOL process turbidimeter allows for the measurement of the turbidity of process water on-line. The White Light MICRO TOL has been designed to meet the design criteria specified by the US EPA 180.1 on turbidity measurement. The infrared MICRO TOL was designed to meet the design criteria specified in ISO 7027 and DIN 27027 for the measurement of the turbidity of a sample. Both models have long life lamps. Some models have ultrasonic cleaning. Refer to section 8.2 for more information.
1.2 Unpacking and Inspection of the Instrument and Accessories The table below indicates the items in the turbidimeter shipment. Item MICRO TOL Turbidimeter c/w Field Terminal Box & Flow Through Assembly Quantity 1 Instruction Manual 1 Desiccant Pack 1 Cuvette (Single Pack) 1 Tubing Kit: 1-shutoff clamp 1-backpressure valve 2-connecting tubing with fittings for flow through assembly 1-drain vent screw (used in pressurized systems) 1 Remove the instrument from the packing carton.
1.4 The Touch Pad Figure 2 illustrates the touch pad. The touch pad has four buttons: MODE/EXIT, ↵, t, and u. The MODE/EXIT button is used to cycle between the three operational modes of the instrument: CAL, CONFIG, and AUTO (Measurement) mode. The ↵ button enters the option (or mode that is highlighted or chosen. The tand u buttons are used to change settings. Figure 2: Touch Pad 1.5 Vapor Purge The Micro TOL is equipped with a continuous vapor purge system.
3.0 Installation and Commissioning Prior to use for the first time, the supplied desiccant pouch will need to be installed. Refer to section 10.2 Replacing or Installing the Desiccant Pouch. 3.1 Mounting & Site Selection The instrument is designed for wall mounting. If wall mounting is not practical, the instrument can be mounted on any suitable level surface.
3.2 Plumbing The recommended plumbing for the instrument is shown in Figure 4. The instrument is designed to require very little head pressure to operate; around 6.9kPa (1 PSI). The flow through cuvette is rated for a flow of 100ml/min. – 1 liter/min. (0.026-0.26Gal/min). The integral pressure regulator is rated for a maximum pressure of 1380 kPa (200 PSI.). The maximum allowable fluid temperature is 50°C (122°F).
3.2.1 Drain Vent: The Micro TOL has been fitted with a drain vent in the “OUT” bulkhead fitting. This fitting allows for atmospheric equalization, thus helping to alleviate bubble formation in the cuvette. Refer to Figure 4. Upon initial flow minor leakage may occur through the drain vent. This will subside once normal flow is established. For some high pressure systems, where the vent hole continuously leaks, a 6:32 seal screw is provided which should be inserted into the vent hole and tightened.
Figure 5: Electrical Connections for the Instrument 3.3.1 Power: The instrument is equipped with a 100-240 VAC, 47-63 Hz switching power supply; please verify that the line voltage falls within these specifications. It is recommended that a circuit breaker be placed prior to the power connection to allow for service. While making connections, refer to Figure 5. The Micro TOL is not supplied with a power cord. 3.3.
4.0 Operation This process turbidimeter allows for the measurement of the turbidity of process water online. The turbidity of the process water is usually reported in Nephelometric Turbidity Units (NTU), but may be reported in Formazin Nephelometric Units (FNU). Readings above 1000 NTU (100 for models 20055 & 20056) are outside the range of this instrument. Readings above 1100 NTU (110 for models 20055 & 20056) will cause the display to flash indicating an over range condition.
The security code (333) must be entered to gain access to CAL or CONFIG menus. Notice that the first number in the code is flashing; the flashing indicates that this is the number to be changed. Use the tor u arrows to select the first of the three numbers in the code and then press the ↵ button to accept the first number of the code. Now enter the second number in the code. Proceed as with the first number followed by ↵.
5.0 Instrument Calibration The instrument was calibrated and tested prior to leaving the factory. Therefore, it is possible to use the instrument directly out of the box. Under normal conditions, recalibration is recommended at least once every three months1. Relay contacts will change to the alarm state while the instrument is in the calibration and/or in the configuration mode.
5.2 Calibration Procedures 1. Select the calibration function of the instrument by pressing the MODE/EXIT button once. The arrow beside CAL will be illuminated on the display. The lower display shows alternating 1000 (the value of the standard that is requested) and ↵. The upper display shows the real-time reading to allow the standard to be indexed. Refer to section 6.1 for information on indexing cuvettes. 2. Remove the flow through unit. 3. Insert the requested 1000 NTU standard.
12. Insert the requested 0.02 NTU standard. Index the standard to the lowest value on the upper display. 13. Press the ↵ button to accept the calibration. 14. The lower display will count down the progress of the calibration step. 15. The instrument will return to AUTO mode at the end the calibration. Note: During calibration, the fan inside the instrument is turned off to extend the life of the desiccant.
6.0 Instrument Offset In certain instances, it may be desirable to use an offset factor to calibrate the instrument rather than performing a physical calibration of the instrument (as described in section 5.2). This procedure is not recommended in lieu of regular instrument calibration but it can be used in situations where the number of instruments used makes regular calibration prohibitive.
7. If the option was turned On, the upper row will display the offset required. This will add or subtract the value of the offset to the measured NTU value. As an example if the Micro TOL measures the process at 0.16 NTU but the laboratory instrument read the sample at 0.12 NTU, adding an offset of –0.04 would result in the Micro TOL displaying 0.12 NTU. Select the desired offset level using the t and u buttons. Once the desired level has been set, press the ↵ button to accept it. 8.
7.0 Instrument Configuration (CONFIG mode) The instrument has been designed to provide the ability to customize the instrument according to needs at any time during normal operation. This mode has been split into sub-menus to facilitate instrument configuration. This section describes how to use each of the sub-menus to configure the instrument.
Note: The 4MA can be set higher than the 20 MA level to invert the output current if required. This may be required to control a dosing pump The next, prompt will be the turbidity level assigned to the 20 mA output level (20MA) on the lower row of the LCD display). Select the turbidity level to assign to the 20MA using the t and u buttons. Once the desired level has been set, press the ↵ button to accept it. The factory setting is 10.00 NTU. 7.
7.4 Configuring the RS–485 Port If the instrument is equipped with this option, and the I/O selection is changed to 485, prompts will appear for setting the baud rate and the address. Select the correct baud rate (1200, 2400, 4800, 9600, or 19200) for operation of the I/O port by pressing the t or u buttons to change the displayed baud rate. Press the ↵ button to continue on and select the desired instrument address using the t or u buttons. Once the selection is satisfactory, press the ↵ button.
These three items are described below: Alarm Function: The alarms can either be turned OFF or programmed to operate in one of three different manners: 1. HI alarm: the relay changes state when the measured turbidity level is higher than the programmed alarm level for a prescribed amount of time. 2. LO alarm: the relay changes state when the measured turbidity level is lower than the programmed alarm level for a prescribed amount of time. 3. Error: the relay changes state when a system error occurs.
Alarm 1 Delay Times: Delay On: The following display will appear to allow to select the number of seconds currently set for the “delay on” time. The current selected number of seconds will be shown. Select the desired number of seconds for the “delay on” time for this alarm using the t and u buttons. Once the desired delay time has been set, press the ↵ button to accept it. Delay Off: Next, the following display will appear to select the number of seconds currently set for the “delay off” time.
7.7 Enabling the Security Access The instrument is equipped with a security access. If this option is turned on, the user is required to input the access code into the instrument to get to any mode other than AUTO. The only code is 333. This code may not be changed. See section 4.2 for more information on this security feature. The security key icon will be visible and flashing on the display whenever the access option is selected using the t or u buttons. (On or OFF). 7.
7.10 Displayed Resolution The instrument is equipped with the ability to display several levels of resolution. The instrument can display up to four digits to the right of the decimal place for turbidity readings below 10 NTU. The default setting is 0.01 NTU. If the last digit or two is not stable, adjust the resolution to hide these digits. Change the resolution by pressing the t or u button. When the desired digit resolution has been selected, press the ↵ button. 7.
The most common unit is NTU (Nephelometric Turbidity Units) however the instrument can display in FNU (Formazin Nephelometric Units). All instruments are shipped from the factory set in NTU mode. Make a selection using the t and u buttons then press the ↵ button. 7.13 Ultrasonic Cleaning (Model 20055, 20056, 20063 & 20064) This allows for a selection menu to turn off the ultrasonic cleaning function if desired. The default mode is On. Make a selection using the t and u buttons then press the ↵ button. 7.
7.15 Desiccant Alarm When the humidity detector in the Micro TOL indicates that the internal environment is close to the point where humidity could cause condensation, the instrument will display DESC as a screen warning. If desired, a desiccant warning can: • Activate the alarms relays. • Can activate an alarm condition on the 4-20mA. To activate the alarm relays when the desiccant fails, select set one or both alarms to Error (see section 7.5 Configuring the Alarms).
7.16 4mA Adjustment If the 4-20 mA setting is turned ON (7.2 Setting the 4-20 mA Output), the following two menus will appear. The first menu outputs a constant 4 mA while allowing for a small amount of adjustment. The adjustment can be made using the S and T buttons. This adjustment will allow the operator to make the Micro TOL agree with a PLC or SCADA system. The adjustment limits are ± 200 counts or about ± 0.2 mA.
8.0 Additional Features and Options 8.1 Backlit LCD The backlit LCD allows for easier readability of the LCD display in low light or no light conditions. The backlight is intended for continuous operation. The brightness is adjustable from a menu in the CONFIG mode. 8.2 Ultrasonic Cleaning (Models 20055, 20056, 20063 & 20064) This factory installed option is used to continuously clean the flow through cuvette.
SENSOR (TOP VIEW) FLOW THROUGH CUVETTE ULTRASONIC SPRING CONNECTIONS ULTRASONIC TRANSDUCER Figure 6: Operational parts of the Ultrasonic Cleaning System 8.3 RS-485 Outputs The Micro TOL has the capability to operate in three different RS-485 modes for all models. Included is a mode for interfacing into the HF Online software package (section 8.3.1 below), and a simple communication mode. A third operating mode is the Modbus communications.
• The same attention character “:” in ASCII or 3A Hex • The address of the Micro TOL • The Reading • The Unit (NTU) A sample communication would look like this: (Master computer requesting a report from address #1) : 1 CRLF (Micro TOL set to address #1 Response) :001 0.0249 NTU 8.3.3 Modbus Communication Modbus protocol communication is operational on all models. The Modbus information is covered in a separate manual (Catalog # 19777).
9.0 Troubleshooting & Maintenance 9.1 Micro TOL Fault Detection The Micro TOL performs continuous diagnostic monitoring. In the Micro TOL there are three levels of fault detection; warnings, errors and failures. Any faults are displayed in a queue form in the bottom row of the LCD. How these faults are indicated depends on the settings made in sections 7.3 Configuring the Error Level and 7.5 Configuring the Alarms.
9.3 Diagnostic Chart Symptom Cause Cure Lower display shows MA 4-20 mA loop open Lower display shows DESC Desiccant pouch bad Lower display shows LAMP Lamp failed Lower display shows FLOW Sample flow has stopped Lower display shows FAIL Readings are higher than expected Major system fault (1) Bubbles in solution Check wiring. See sections 3.3.4 and 7.2 Change desiccant pouch. See section 10.2 Replace lamp. Refer to section 10.3 Restore flow.
10.0 Routine Maintenance 10.1 Cleaning the Flow Through Cuvette Measurement cuvettes used for both grab sample and the flow through should be clean and free of marks or scratches. Cleaning is accomplished by cleaning the interior and exterior with a detergent solution and then rinsing several times with distilled or deionized water. The cuvette can be replaced by first shutting off the flow using the provided shutoff clamp; unscrewing the old cuvette and replacing with a fresh clean one. 10.
11.0 Accessories and Replacement Parts List The items shown below are recommended accessories and replacement parts. Accessory Electronic Service Module For Micro TOL 2 Catalog Number White Light Infrared 02053 02054 Electronic Service Module For Micro TOL 3 02055 02056 Electronic Service Module For Micro TOL 4 02063 02064 Operating Manual, Micro TOL 24034 ProCal Calibration Kit, .02, 10 & 100 NTU 39953 ProCal Calibration Kit, Full Range, .
12.0 Warranty HF scientific inc., as vendor, warrants to the original purchaser of this instrument that it will be free of defects in material and workmanship, in normal use and service, for a period of one year from date of delivery to the original purchaser. HF scientific inc.’s obligation under this warranty is limited to replacing, at its factory, the instrument or any part thereof.
