Summary of Contents for Foxcroft FX-Mini
- Page 1 Foxcroft FX-Mini & FX-Mini-R Single Channel Toxic Gas Detector Operating Manual Document OMFXMINI102019...
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Page 3: Table Of Contents
Table of Contents Page Introduction, Gas Sensors Available Warnings, Limitations FX-Mini Gas Detector Illustration Detector Component Description, Main Circuit Board, Default Wiring Detector Component Description, Remote Reset, Power Supply, Battery Operation Detector Component Description, 10A Relay Card Gas Sensor, Test Button, Unpacking, Contents, Serial Number Installation, Sensor Placement Guidelines Installation, Mechanical &... - Page 4 The FX-Mini can be supplied with any of the following gas sensors, gas alarm trip levels below are fixed to prevent tampering, non-standard ranges and trip levels are available. Values are in PPM except...
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Page 5: Warnings, Limitations
The FX-Mini has a limited life. This equipment contains many parts. Just as with any other device any one of these parts could fail at any time. Therefore, you must test your detector on a regular basis. Be sure to have it repaired or replaced when it fails to test properly. -
Page 6: Fx-Mini Gas Detector Illustration
FX-Mini Gas Detector Illustration All-in-One Option 1. Main Circuit board. 2. AC-DC Power Supply 3. Gas Sensor. 4. 10A relay card. 5. Silence & Reset Button 6. Buzzer... - Page 7 FX-Mini-R Gas Detector Illustration Remote Controller Option In the FX-Mini-R option the gas sensor is mounted in a separate wall mount enclosure that is placed in the potential hazard area while the controller is mounted outside of the potential hazard area. The devices are connected by 25-feet of 22 AWG shielded cable, up to 2,000 feet of cable is available optionally.
- Page 8 Factory Default Wiring The FX-Mini is pre-wired at the factory as follows. Field wiring to the circuit board is unnecessary unless you are connecting a NC remote reset switch. 12 & 24VDC boards are not interchangeable.
- Page 9 Detector Component Description Terminal connections are provided for both +12VDC and +5VDC power input to the relays. 12VDC coils are standard. The 5VDC terminals are not used as standard and should be ignored. Remote Reset A terminal (supplied with a factory installed jumper) is provided on the main circuit board to connect a normally closed (NC) remote reset switch.
- Page 10 Detector Component Description 10 Amp Relay Card The FX-Mini gas detector includes a separate card containing (4) 10A SPDT Form C dry contact relays. The 10A relays are unpowered when the detector is not in alarm state; they energize upon reaching an alarm set point.
- Page 11 The calibration nose fitting is used only for calibration, not for normal operation. Test Button Unlike the previous model FX-1, the FX-Mini does not include a test button. In all Foxcroft gas detectors the test button has only tested electrical continuity and functions of components such as the buzzer, LED’s, and relays.
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Page 12: Installation, Mechanical & Dimensions
Installation, Mechanical Sensor Placement Guidelines The FX-Mini Gas Detector is a fixed, single point type that can only sense toxic gas or oxygen that diffuses into the sensing chamber of the gas sensor. Proper placement of the sensor in the potential hazard area is essential to the operation of the gas detector. - Page 13 Installation, Mechanical, Dimensions , Dimensions 1. Attach the wall mounting feet to the rear of the Attach the wall mounting feet to the rear of the main enclosure using # 10 diameter 10 diameter screws. Mounting screws are not included re not included.
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Page 14: Installation, Wiring Connections
Installation, Wiring WARNING: The alarm relays are not fuse protected. You must install a current limiting device to limit current to the relays to less than their resistive current rating. WARNING: Make all connections before you apply power to the detector. 1. -
Page 15: Startup
Startup 1. Remove the cardboard covering the gas sensor opening. a. NOTE: You must never operate the detector with the calibration nose installed, it is used only for calibration. 2. Power Up: Turn on power to the detector by plugging the power adapter into a standard 120VAC eletrical outlet. - Page 16 LED illuminated on the relay card. Alarm Set Points and Conditions The FX-Mini includes two gas alarm set points and a sensor fail alarm set point: Warning: an alarm set point set to OSHA, NIOSH and ACGIH recommendations. Danger: an alarm set point set to OSHA, NIOSH and ACGIH recommendations.
- Page 17 Normal Operation and Alarm Conditions Danger Alarm When the gas concentration reaches the Warning level its alarm LED will illuminate orange. When the Danger alarm set point is reached the Warning indicator will go out, and the red LED indicator on the face of the detector will illuminate, manual reset latching relays #1 and #2 will energize and their LED’s will illuminate, any additional relay configured to alarm at this level will energize and the piezo buzzer will sound.
- Page 18 Gas Exposure The electrochemical gas sensors used in FX-Mini gas detectors are strictly designed and intended for occasional intermittent exposure to the target gas. Under no circumstances will the sensor survive continuous exposure to target gas.
- Page 19 Gas Sensors General Information & Environmental Effects with water. The sensor can gradually be restored to balance without permanent damage by exposure to lower relative humidity. Likewise, continuous operation at 0-15%RH will cause the sensor to dry out, which can cause the acid electrolyte to attack the seals.
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Page 20: Calibration
Gas Sensors Sensor Zero Point Drift (cont.) Exposure to high levels of gas, or exposure to concentrations that exceed the range of the • sensor. Low level gas exposure for extended periods of time. • Continuous exposure to solvent vapors or highly corrosive gases. •... - Page 21 Calibration Calibration Frequency, continued 1. The gas sensor should undergo a sensor response, or bump test, at least once per month. If the sensor fails the bump test then full calibration is required. 2. The gas sensor should undergo a full calibration at least once every 6 months and after the sensor detects a gas leak.
- Page 22 Calibration The room where the gas sensor is mounted and is mounted and where the zero point is adjusted should should not contain any other forms of chlorine, including calcium hypochlorite, sodium hypochlorite, or various cleaning any other forms of chlorine, including calcium hypochlorite, sodium hypochlorite, or various cleaning any other forms of chlorine, including calcium hypochlorite, sodium hypochlorite, or various cleaning chemicals and solvents that may or may not contain chlorine.
- Page 23 Calibration 4. Plug the supplied test connector into the circuit board connector CN2. If you don’t have the connector, insert to wire leads into the millivolt connector, observe polarity when connecting your meter. In ambient air, the zero reading should be 40 millivolts. 6.
- Page 24 Calibration Full Calibration, Toxic Gas Sensors Warning: The gas regulator and tubing must be dedicated to one type of gas only, do not use a regulator and tubing for chlorine that was used on sulfur dioxide or ammonia, or vice versa. 5.
- Page 25 Calibration Full Calibration, Toxic Gas Sensors The correct voltage output for the target gas being used can be determined as follows: (16 x gas concentration) / range of sensor + 4 x 10mV a. Example: Calibrating a hydrogen sulfide sensor to a range of 0-50ppm using a calibration gas concentration of 20ppm: (16 x 20) / 50 + 4 + 10 = 104 mV 12.
- Page 26 Calibration Full Calibration, Ready Advanced Ammonia Sensors Zero Point Calibration • Connect and apply power to the Gas Sensor Module. • Allow the sensor to stabilize for a minimum of 5 minutes in clean air. • Once the output signal is stable, press and hold the calibration button for between 6 and 12 seconds. •...
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Page 27: Sensor Response (Bump) Test
Calibration Sensor Response (Bump) Test Important The sensor response test, also known as a “bump” test, is only used to test the gas sensor’s ability to respond to a gas leak. This test is not a calibration. Sensor response, or bump tests should only be done with a known target concentration gas. -
Page 28: Gas Sensor Replacement, Electrochemical Cell Only
Gas Sensor Replacement Electrochemical Cell Only Sensor replacement in the FX-Mini Gas Detector is easily done with minimal tools. Tools Required: Small non-metallic Jeweler’s Screwdriver with a 1.2 x 0.5 mm tip • Slotted or Phillips Screwdriver • Needle nose Pliers •... - Page 29 Gas Sensor Replacement Complete Sensor with 4-20mA Transmitter Board Tools Required: Slotted or Phillips Screwdriver • Needle nose Pliers • 1. Disconnect the AC power from the detector. 2. Remove the sensor enclosure from the wall. 3. Remove the front cover of the sensor enclosure. 4.
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Page 30: Gas Sensor Components
Gas Sensor Components See page 26 for Ammonia, Ozone and Hydrogen Cyanide sensor components... -
Page 31: Technical Data, Specifications
Technical Data, Specifications Gas Sensor Silence & Reset Button: (1) Dual function NC pushbutton, first push silences the buzzer, the 3-Electrode, electrochemical fuel cell installed second resets alarms & relays in detector enclosure Operating Voltage: Regulated 12VDC Response Time (T90) Power Supply: by included AC-DC power <60 Seconds at 20°C. - Page 32 Technical Data, Specifications Battery Backup: A separate 300VA external Main Enclosure battery backup / UPS is available, part #FX- BB110 Hinged door NEMA 4X/IP 66, ABS plastic rated for indoor use, 5.9” wide x 5.9” high x 3.5” deep with stainless steel wall mount feet, plastic hinges and latches.
- Page 33 A Return Material Authorization Number (RMA) is required before shipping any products for service. Call telephone number above to receive a RMA number. NOTE: Returns will only be held at Foxcroft for 90 days. If a decision is not made regarding the repair, the product will be returned.
- Page 34 Buyer agrees to hold Foxcroft Equipment & Service harmless from all claims for damages arising out of injury or death to any person or damage to any facility, or any other property, or loss of use of any such...
- Page 36 Serial Number Label for FX-Mini Toxic Gas Detector Foxcroft Equipment & Service Co. Inc. 2101 Creek Road, P .O. Box 39 Glenmoore, PA 19343 Tel: (800) 874-0590 (610) 942-2888 Fax: (610) 942-2769 Email: sales@foxcroft.com Web: www.foxcroft.com...
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