DRT-15CE PORTABLE TURBIDIMETER OPERATING & MAINTENANCE MANUAL
DRT-15CE PORTABLE TURBIDIMETER OPERATING & MAINTENANCE MANUAL HF scientific 3170 Metro Parkway Fort Myers, FL 33916-7597 Phone: (239) 337-2116 Fax: (239) 332-7643 Toll free: 888-203-7248 DRT-15CE (5/10)
FOREWORD HF turbidimeters are manufactured to meet design criteria for nephelometers as described in Standard Methods For Examination of Water and Wastewater. HF turbidimeters are approved by the U.S. EPA* as a means to measure the turbidity of potable water, waste water, and other liquids. HF turbidimeters provide a linear display of turbidity, throughout all ranges, in Nephelometric Turbidity Units (NTU).
TABLE OF CONTENTS Page 1.0 SPECIFICATIONS...........................................................................1 2.0 PACKING LIST FOR THE DRT-15CE............................................1 3.0 PRE-OPERATION CHECK OUT....................................................2 4.0. OPERATION AND DESCRIPTION................................................3 5.0 RECORDER OUTPUT.....................................................................4 6.0. CRITICAL MEASURING AREA.........................
1.0 SPECIFICATIONS FOR DRT-15CE Ranges NTU 3 Ranges: 0-10, 0-100, 0-1000 NTU Linearity (+ or -) 1% /10, 5%/100, 10%/1000 of Full Scale Repeatability (+ or -) 1% of Full Scale on either range Response Virtually immediate in all ranges Power Supply 6 Volt battery. 4.0 amp hours 120/240 VAC, 50/60 Battery Charger Controls Combination Range Switch for: ON/OFF and Range Selection.
3.0 PRE-OPERATION CHECKOUT Extreme care should be taken when handling the Calibration Standard or sample cuvettes as surface scratches or finger smudges will cause analysis errors. Handle these items by the top only. The battery, when new, usually requires several cycles of discharging and recharging in order to obtain optimum rated life between charges. The turbidimeter provides up to 20 hours of continuous operation as a port able battery operated unit between recharges.
4.0 OPERATION AND DESCRIPTION To operate the turbidimeter, it is first necessary to standardize the instrument. Switch to the “10” range and place the Calibration Standard (0.02 NTU) in the optical well. The EPA recommends that cuvettes used for instrument calibration or sample measurement be indexed. For quick and repeatable indexing of the Calibration Standard, an indexing ring and locator pin are included with this instrument.
5.0 RECORDER OUTPUT The DRT-15CE has a 0-1 mA Recorder Output. The mA output jack is located on right side of the chassis (refer to Figure 2). To use, connect the 1/8" miniplug provided to your recorder. Adjust R17 (pot nearest jack) to obtain a full scale output compatible to a full scale reading on the DRT15CE. Once this adjustment is made, the DRT-15CE will always be set up for this recorder. Use 10, 100 or 1000 NTU standard in appropriate range. 6.
7.0 CALIBRATION PROCEDURES 7.1 Calibration Standards 7.1.1 ProCal Standard Set (optional) Catalog No. 39071 HF ProCal Standards are recommended and certified by HF scientific. They are traceable to freshly prepared formazin primary standards. These standards are very easy to use off the shelf anytime without preparation making them an ideal turbidity standard. A Certificate of Traceability is available on request to the HF scientific Customer Service Department.
Each kit contains: -Instruction manual -1 liter of 4000 NTU Stock Suspension -1 Gallon (3.79 liters) turbidity-free water -4 Sample cuvettes (28 mm) -4 Light Shield Caps -Graduated Pipettes 1 ea. in 1 ml, 10 ml, & 25 ml -1 Calibration Standard The following table gives the recommended dilutions of the stock suspension. Be sure to adequately mix the stock suspension prior to removing a portion for dilution. PROCEDURE NTU Value Pipette Amount Base Formazin Volumetric Flask 10.0 NTU 10.0ml 2.
1000 NTU, 100 NTU & 10 NTU Keep the outside surface of cuvettes clean. When placing any standards in the well, always use the screw cap/ shield to cover the well in order to keep out ambient light. To gain access to the trimpots, remove the accessories from the foam holder. Refer to figure 2 for trimpot identification during the next few steps. 1. Turn the DRT-15CE to the 0 - 10 Range. 2. Insert the calibration standard and index it as described in "Operation and Description".
DRT-15CE (5/10) *Factory set, do not adjust. R17 - Recorder Output R13 - 0 - 1000 Gain R12 - 0 - 100 Gain R11 - 0 - 10 Gain R2 - Ref.
8.0 TROUBLE SHOOTING Symptom Meter does not respond when a sample is set into the well. Possible Cause 1. Lamp is burned out. Replace the lamp and recalibrate. 2. Printed Circuit Board failure. Replace Printed Circuit Board. 3. Battery is low. Charge battery. In the case of 1 or 2 the instrument should be recalibrated. The lamp has an extraordinary long life and therefore replacement is infrequent. Symptom Reference Adjust does not have enough travel to adjust for the calibration standard value.
Symptom No display on instrument at all. Possible Cause 1. Battery is dead. Recharge battery. 2. Fuse has blown. Check battery connections and replace fuse with 1A fast acting 5x 20 mm. Symptom Low battery indicator on after 8 hour charge. Possible Cause 1. Battery is defective. Replace battery. 2. Charger is defective or is not connected to a valid power source. Check for "~" indication on display. 9.0 MAINTENANCE The DRT-15CE is not designed for field servicing.
9.2 LAMP REPLACEMENT The lamp source (HF catalog #21084) used in the DRT-15CE has an extremely long life. Before replacing the lamp, make certain that the battery is not in need of a charge and is not defective. Prior to replacing the lamp, remove the battery as described in battery replacement. Remove the lamp wires at terminal block. To remove the lamp, loosen the two set screws on the outermost barrel with a 5/64" hex wrench and pull the lamp straight out. Replace the lamp in the reverse order.
11.0 WARRANTY HF scientific, inc., as vendor, warrants to the original purchaser of the in struments to 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.
3170 Metro Parkway, Fort Myers, FL 33916-7597 Tel: (239) 337-2116 Fax: (239) 332-7643 Toll free: 888-203-7248 www.hfscientific.
