Instruction Manual 4000 Series Digital Portable Analyzer Service Department (800) 458-6153 ext. 121 (818) 882-2331 ext. 121 FAX (818) 341-0642 E-mail: service@gasdetection.
TABLE OF CONTENTS SECTION TITLE 1.0 Equipment Description Front Panel Rear Panel Right Side Panel Internal components 4 6 7 8 Operating Instructions Setting the Alarm Zeroing the Instrument Sampling 9 10 11 2.0 PAGE 3.0 Calibration Introduction 12 Sample Bag & Pressurized Cylinder Calibration 14 Calibration Procedure 15 4.0 General Maintenance Battery Life Battery Charging & Replacement Water loss in Refillable Sensors Long Term Storage Post Storage Startup 16 16 18 23 23 5.
Introduction Note: It is not necessary to calibrate the monitor when received from the Interscan or an authorized distributor. All Interscan monitors are calibrated at the factory prior to shipment. The Interscan 4000 Digital series operates on the principle of pulling a sample (Sample draw) through a sensor. The Electrochemical sensor is manufactured by Interscan. Electrochemical means that it produces an electrical current proportional to the level of gas passing through.
Designation Function LCD Display: Indicates gas level when function switch is in ZERO or SAMPLE, and battery level when on BAT. TEST A or B. ALARM Light: LED. Flashes ON/OFF when alarm set point is exceeded. ALARM SET: 25-Turn potentiometer with a screwdriver adjustment. Sets the alarm trip point at the desired gas level. (low alarm set must be greater than 5% of the full scale). SPAN/CAL: 25-Turn potentiometer with a screwdriver adjustment.
batteries power the main circuitry and are NOT re-chargeable. Replace if the LCD Display level falls to or below 100 (ignore decimal point). You must allow 24 hours to stabilize prior to use if the batteries are replaced. ZERO: 1.1 10-Turn Potentiometer. Allows the meter to be adjusted to zero, by compensating for any background signal. Rear Panel (fig. 2) Designation Function INLET: ¼” O.D. Quick connect or compression gas fitting. OUTLET: ¼” O.D. Quick connect or compression gas fitting.
RECORDER OUTPUT: ¼” phone jack for Analog recorder output connection. Typically 0-100mV. positive, Ring – ground. 1.2 Tip – CHARGER INPUT: 3.5mm phone jack for 9V DC, 100mA charger input. Tip – positive, Ring – ground. SENSOR SCREWS: Used to hold Sensor or Sensor base in place. Right Side Panel (fig. 3) AUDIBLE ALARM: 120-00004 REV A 10/6/2011 Piezoelectric Horn, sounds when alarm set point is exceeded.
The above (fig 3) indicated two #1 Phillips-head screws located on the right side panel. Removing these screws allows access to the internal components. Do not remove any other screws. 1.3 Internal Components (fig.
Operating Instructions For overseas shipment, analyzers are shipped with the 15-Pin D connector DISCONNECTED from the circuit board. This is to preserve the battery life during shipment. To re-connect the wire bundle, simply open the analyzer by removing the 2 screws located on the right side panel. They are located about 1 inch from the top and 1 inch from the bottom, on the door. (fig. 2 pg. 6) Reconnect the 15-pin D connector and allow 24 hour stabilization prior to use. 2.
2.1 Zeroing the Analyzer The Analyzer must always be zeroed, prior to use. Zero adjustments must be made in the SAMPLE mode, i.e. with the pump on, in air free of interfering gases. If necessary, use zero air or a C-12 filter (provided) to zero in the sampling area. When using C-12 zero filter, connect externally to gas inlet. Allow reading to stabilize, before making final zero adjustment, (stabilization can take approximately 20 minutes). The C-12 filter must be removed after zeroing the analyzer.
2.2 Sampling Analyzer must be zeroed prior to sampling (section 2.1). Set the FUNCTION switch to SAMPLE to activate the pump. If the INLET or OUTLET is blocked, the pump may stall. Note: Running the Analyzer with blocked INLET or OUTLET may lead to the sensor leaking caustic electrolyte leading to analyzer damage. Power analyzer off, and clear the blockage. To reset the pump, set the FUNCTION switch to ZERO momentarily and then switch again to SAMPLE.
Calibration 3.0 Introduction All analyzers are factory calibrated prior to shipment. There is no easy answer as to how often a monitor should be calibrated. This is strictly a function of the application (gas concentration and frequency of exposure to target gas). The purpose for calibration is to compensate for any possible decrease in sensor sensitivity. The primary cause of sensitivity decrease is excessive loss of water by evaporation. A secondary cause may be by contamination from unknown sources.
As indicated on the certification sheet, the ECS program verifies sensor sensitivity only. It does not certify the analyzer as a whole. Most importantly, the ECS program is not a substitute for basic analyzer maintenance, nor does it check for malfunction of the analyzer components.
3.2 Sample Bag Calibration & Pressurized Cylinder Calibration Whatever the source of calibration gas, the recommended method is to collect the gas in the proper sample bag, which is then attached to the analyzer INLET. The calibration gas is drawn from the proper sample bag through the sensor. An exception to the use of a sample bag is for those gases, which are reactive with, or chemisorbed by the bag itself (e.g. Chlorine, Hydrazine). Teflon® or Tedlar® bags are suitable for H2S, SO2, NO and NO2.
3.3 Calibration Procedure Analyzer must be zeroed prior to calibration (sec 2.1). 1. For all gases, except Chlorine or other chemisorbable types, fill the 5 liter sample bag with calibration gas, and attach it to the external inlet fitting. This is best done by attaching a short length (2 inch) of 5/16 inch (7.9 mm) O.D. flexible tubing to the sample bag nipple, then attaching the tubing to a 2 inch (51 mm) length of ¼ inch (6.4 mm) O.D.
General Maintenance 4.0 Battery Life Because of current requirements of the circuitry, “C” Size Alkaline battery life is approximately 4 weeks, whether the unit is operating or not. Note: Batteries vary in capacity by manufacturer and may provide more battery life. Analyzer malfunction, as a result of low battery, will be evident as either inability to zero the monitor or clipping of the display at a fixed reading below full scale. Nickel-cadmium battery life is indeterminate.
indication difficult. It is recommended that the batteries be recharged if the reading in BATTERY TEST “A” is at 100 (ignoring the decimal place). Allowing the reading to drop below 100 is not recommended. Note: NiCd batteries can develop cell memory. Cell memory is caused by running the analyzer on battery power for a short period of time REPEATEDLY i.e: Running the analyzer for 20 minutes and then recharge. If this occurs repeatedly, the NiCd battery life will only retain a 20 minute charge memory.
distilled or deionized water into the sensor via the red plug, using the plastic syringe (provided). Refer to (fig. 7 pg. 16). Refillable sensors are identified by the red fill plug in the side of the sensor. The fill plug location may vary from (fig. 7 pg. 16). There are two types of refillable sensors. The S-type is a shorter sensor of slightly over 2 1/2 inches ( 64 mm) in height; the P-type is almost 4 inches (104 mm) in height.
(fig. 9) Quick connect male elbow This is a quick connect system comprised of the body, o-ring and ferrule (fig. 9). Disconnect by pushing on the ring where the tubing enters the fitting and gently pulling on the tubing. Re-attach by inserting the tubing all the way in and then gently pull backward. (fig. 10) Barbed male elbow The fitting uses a barbed connector system (fig. 10). Disconnect by pulling on the tubing. Re-attach by pushing the tubing onto the fitting until firmly seated.
Fig. 11 For P-type sensors refer to (fig. 11). Disconnect the 2 electrical connections to the sensor. Disconnect the tubing from each gas fitting. Loosen the screw indicated as “A”. Loosen the clamp screw “B” until the sensor can be removed from clamp. NOTE: DO NOT REMOVE ANYTHING ELSE!!!!!! Restore the sensor to within 5 grams original sensor weight by injecting an equivalent cc of distilled or deionized water (10g. weight loss means add 10cc water). DO NOT OVERFILL.
(fig. 12) For S-type sensors refer to (fig. 12). Disconnect the two electrical connections to the sensor. Disconnect the tubing from each gas fitting. Remove the two Sensor Screws.
Restore the sensor to within 5 grams original sensor weight by injecting an equivalent cc of distilled or deionized water (10g. weight loss means add 10cc water). DO NOT OVERFILL. If sensor will not take on any more liquid (liquid starts coming out the fill port) do not attempt to add additional distilled water. Note: Weight loss of excess of 30 grams may prevent the restoration of the weight to within 5 grams of the original weight. DO NOT OVERFILL.
5.0 Troubleshooting Symptom No power. Corrective Action Ensure the FUNCTION switch is not in the OFF position. Are Ni-Cd batteries charged? (See Section 4.1) Pump won’t run. Ensure the FUNCTION switch is not in the OFF, or ZERO position. Are Ni-Cd batteries charged? (See Section 4.1) Are INLET/OUTLET fittings plugged? Is any tubing kinked? Can’t zero. Are alkaline batteries low? (See Section 4.1) Were alkaline batteries just replaced? (See Section 4.
Warranty 6.0 INTERSCAN’s Warranty Policy INTERSCAN CORPORATION warrants portable analyzers of its manufacture (sensors, batteries, fuses, lamps, tubing, fittings, filters, and scrubbers excepted) to be free from defects in material and workmanship for a period of one year from date of shipment. INTERSCAN CORPORATION warrants sensors of its manufacture to be free from defects in material and workmanship for a period of six months from date of shipment.
Return Authorization 7.0 INTERSCAN’s Return Authorization Policy All returns for repairs require a "RETURN AUTHORIZATION NUMBER" issued by the INTERSCAN Service Department upon request. Below is the link to the RMA form: http://www.gasdetection.com/contact/index.php This is done primarily to cause the user to contact the factory directly. The reason for this is that a high percentage of service problems are resolved over the telephone, avoiding the need for returning the analyzer or part.
8.0 Appendix Appendix A INTERFERING GAS DATA No analytical method is completely specific. Gases present in the environment, other than the "target" gas of measurement, may affect analyzer response. Interferences are not necessarily linear, and may also exhibit time dependent characteristics. The charts that follow detail the approximate concentration in parts per million of interfering gas required to cause a 1 ppm deflection in the chosen analyzer. In many cases, specificity can be improved.
Chart 1: CO, Cl2, ClO2, H2, H2S, NO, NO2, O3, SO2 analyzers (1) Data shown for H2S models with ranges higher than 0-1999 ppb (2) Data shown for H2S models with ranges of 0-1999 ppb and lower [N] = Negative interference ‡ = Hydrocarbons ¤ = Rejection ratio can be improved electronically Chart 2: Ethylene oxide (EtO) (C2H4O) analyzers INTERFERING GAS Cl2 CO CO2 25 [N] 20 >10 ethyl Freon glutaraldehyde isopropyl N2O alcohol alcohol NH3 EtO ANALYZER 5 380 5 >10 5 1.
c. Using alternative germicides, which do not contain isopropyl alcohol. The EtO sensor may also respond to strong odors of colognes and perfumes, and to certain floor strippers and waxes. Refer to guidelines above covering isopropyl alcohol. Remember that you are attempting to monitor parts per million levels of ethylene oxide in an environment that may contain percent (10,000 ppm = 1 percent) levels of these potentially interfering compounds.
Chart 5: C2H4 (ethylene) analyzers [N] = Negative interference 120-00004 REV A 10/6/2011 4000 DIGITAL MANUAL PAGE 28
Appendix B SCRUBBER INFORMATION TYPE FOR ANALYZER REMOVES #56 NO SO2, NO2, H2S, HCl, HCN #158 CO, EtO, SO2F2 SO2, H2S, NO, NO2 C-12 ≤ 20 ppm range & all ALL GAS TYPES EXCEPT CO EtO, HCHO, HZ MS-100 CO Alcohol & Aldehydes MS-149 H2S Cl2, SO2 FB-160 SO2 H2S, NO2 FB-170 NO2 H2S, HCl, HCN, SO2 FB-325 HCHO, HCN H2S, HCl, SO2 FB-149 H2S HCl, SO2, NO2 FB-100 NO2 H2S, SO2 #97 ClO2 Cl2 FB-150 120-00004 REV A 10/6/2011 4000 DIGITAL MANUAL PAGE 29
