CTX 300

Oldham CTX 300 Fixed Gas Detector

Code: CTX 300
  • Toxic gases or oxygen
  • Minimal Maintenance
  • Interchangeable and pre-calibrated sensor modules

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The Oldham CTX 300 can detect O2, CO2, toxic and refrigerant gases. Choose from a range of sensors (infrared, electrochemical, semiconductor) according to your application needs. It is also available with or without display.

Sensor replacement does not require any special menu access. Just replace the sensor without even powering down the transmitter.

As the only consumable element, the CTX 300 sensor is easily replaceable. New sensors come pre-calibrated from the factory. So during the sensor exchange, no calibration gas is required, nor are the detector or remote central controller adjustments necessary. Oldham is a Teledyne brand.

  • Durable in harsh environments
  • Up to 5 years of life for the O2 sensor
  • CO2 detection over three different ranges: 0-5000 ppm, 0-5% vol. and 0-100% vol
  • Optional LCD
  • Approvals EMC according to EN50270
  • Ingress Protection IP 54
  • Weight 520 g (18.2oz)
  • Dimensions 130 x 136 x 69 (lxhxd) in mm, (5.12″x 5.35″ x 2.72″)

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Title Size
GTX 300 Brochure 255 KB
CTX 300 Manual 1 MB

Additional information

Weight 0.09 kg

Ordering Information

CTX 300 without display 4-20mA – with electrochemical sensor supplied with cable gland

ASH3 Arsine
CTX300-243 ASH3, without display, range 0-1ppm

C2H4O Ethylene oxide
WC30-248 C2H4O, without display, range 0-100ppm

CH2O
CTX300-247 CH2O, without display, range 0-50ppm

Cl2 Chlorine
WC30CL2 Cl2, without display, range 0-10ppm

ClO2 Chlorine dioxide
WC30CLO ClO2, without display, range 0-3ppm

CO Carbon monoxide
WC30COA CO, without display range 0-100ppm
WC30COB CO, without display, range 0-300ppm
WC30COC CO, without display, range 0-1000ppm
WC30COD CO, without display, range 0-1 %

COCl2 Phosgene
WC30CCL COCl2, without display, range 0-3 ppm

ETO
WC30OET Ethylene Oxide, without display, range 0-30ppm

F2 Fluorine
WC30F2A F2, without display, range 0-1ppm

H2 Hydrogen
WC30H2A H2, without display, range 0-2000ppm
WC30H2B H2, without display, range 0-2 %

H2S Hydrogen sulfide
WC30HSA H2S, without display, range 0-30ppm
WC30HSB H2S, without display, range 0-100ppm
WC30HSC H2S, without display, range 0-1000ppm

HCl Hydrogen chloride
WC30HLA HCl, without display, range 0-30ppm
WC30HLB HCl, without display, range 0-100ppm

HCN Hydrogen cyanide
WC30HNA HCN, without display, range 0-10ppm

CTX 300 without display 4-20mA – with electrochemical sensor supplied with cable gland

HCN Hydrogen cyanide
WC30HNB HCN, without display, range 0-30ppm

HF Hydrogen fluoride
WC30HFA HF, without display, range 0-10ppm

NH3 Ammonia
WC30NH1 NH3, without display, range 0-1000ppm
WC30NH1F NH3 for low-temperature application (-40°C/-40°F), without display, range 0 1000ppm
WC30NH2 NH3, without display, range 0-5000ppm
WC30NH3 NH3, without display, range 0-100ppm
WC30NH3F NH3 for low-temperature application (-40°C/-40°F), without display, range 0-100ppm

NO Nitric oxide
WC30NOA NO, without display, range 0-100ppm
WC30NOB NO, without display, range 0-300ppm
WC30NOC NO, without display, range 0-1000ppm

NO2 Nitrogen dioxide
WC30N2A NO2, without display, range 0-10ppm
WC30N2B NO2, without display, range 0-30ppm
WC30N3B NO2, without display, range 0-100ppm

O2 Oxygen
WC30O2F O2, with standard 2 year sensor lifetime, without display, range 0-30 %, -20°C to +50°C
WC30O2G O2, with long life 5 year sensor lifetime, without display, range 0-30 %, -40°C to +50°C
WC30O2S O2, without display, range 0-100 % vol

O3 Ozone
WC30O3A O3, without display, range 0-1ppm

PH3 Phosphine
6513584 PH3, without display, range 0-1000ppm
WC30PH3 PH3, without display, range 0-1ppm

SiH4
WC30SIA SiH4, without display, range 0-50ppm

CTX 300 without display 4-20mA – with electrochemical sensor supplied with cable gland

SO2 Sulfur dioxide
WC30SOA SO2, without display, range 0-10ppm
WC30SOB SO2, without display, range 0-30ppm
WC30SOC SO2, without display, range 0-100ppm

CTX 300 without display 4-20mA – with infrared sensor supplied with cable gland

CO2 Carbon dioxide
WC30CO2A CO2, without display, range 0-5000ppm
WC30CO2B CO2, without display, range 0-5.00 % vol
WC30CO2C CO2, without display, range 0-100 % vol

CTX 300 without display 4-20mA – with semi-conductor sensor supplied with cable gland

2-Butanone
CTX300-659 analogue transmitter without display, 0-500ppm 2-Butanone (MEK)

CH2Cl2 Dichloromethane
CTX300-507 analogue transmitter without display, 0-500ppm Dichloromethane (Methylene chloride)

Chloromethane
CTX300-508 analogue transmitter without display, 0-500ppm Chloromethane (Methylchloride)

Ethanol
CTX300-654 analogue transmitter, without display, 0-5000ppm Ethanol
CTX300-656 analogue transmitter without display, 0-500ppm Ethanol

FX56
CTX300-510 analogue transmitter, without display, 0-2000ppm FX56

Isopropanol
CTX300-658 analogue transmitter without display, 0-500ppm Isopropanol

R11
CTX300-505 analogue transmitter, without display, 0-1% volume R11

R12
CTX300-500 analogue transmitter, without display, 0-1% volume R12

R123
CTX300-509 analogue transmitter, without display, 0-2000ppm R123

CTX 300 without display 4-20mA – with semi-conductor sensor supplied with cable gland

R1234yf
CTX300-662 analogue transmitter, without display, 0-1,000ppm HFO-1234yf

R1234ze
CTX300-525 analogue transmitter, without display, 0-1,000ppm HFO-1234ze

R134a Freon R134A
CTX300-502 analogue transmitter, without display, 0-2000ppm R134A

R143a
CTX300-511 analogue transmitter, without display, 0-2000ppm R143A

R22 Chlorodifluoromethane (R22)
CTX300-501 analogue transmitter, without display, 0-2000ppm R22

R23 Trifluoromethane (R23)
CTX300-506 analogue transmitter, without display, 0-1% volume R23

R245fa
CTX300-521 analogue transmitter, without display, 0-1000ppm R245FA

R32
CTX300-515 analogue transmitter, without display, 0-1000ppm R32

R404a
CTX300-512 analogue transmitter, without display, 0-2000ppm R404A

R407c
CTX300-517 analogue transmitter, without display, 0-1000ppm R407C

R407F
CTX300-519 analogue transmitter, without display, 0-1000ppm R407F

R408a
CTX300-518 analogue transmitter, without display, 0-4000ppm R408A

R410a
CTX300-514 analogue transmitter, without display, 0-1000ppm R410A

R422d
CTX300-524 analogue transmitter, without display, 0-4000ppm R422D

R434a
CTX300-520 analogue transmitter, without display, 0-4000ppm R434A (RS45)

R507
CTX300-513 analogue transmitter, without display, 0-2000ppm R507

Styrene
CTX300-661 analogue transmitter, without display, 0-500ppm Styrene

CTX 300 without display 4-20mA – with semi-conductor sensor supplied with cable gland

Toluene
CTX300-652 analogue transmitter, without display, 0-2000ppm Toluene
CTX300-657 analogue transmitter without display, 0-500ppm Toluene

Trichloroethylene
CTX300-655 analogue transmitter, without display, 0-500ppm Trichloroethylene

Xylene
CTX300-653 analogue transmitter, without display, 0-2000ppm Xylene
CTX300-660 analogue transmitter without display, 0-500ppm Xylene

CTX 300 with display 4-20mA – with electrochemical sensor supplied with cable gland

Cl2 Chlorine
WC3ACL2 Cl2, with display, range 0-10ppm

ClO2 Chlorine dioxide
WC3ACLO ClO2, with display, range 0-3 ppm

CO Carbon monoxide
WC3ACOA CO, with display, range 0-100ppm
WC3ACOB CO, with display, range 0-300ppm
WC3ACOC CO, with display, range 0-1000ppm
WC3ACOD CO, with display, range 0-1 %

COCl2 Phosgene
WC3ACCL COCl2, with display, range 0-3 ppm

ETO
WC3AOET Ethylene Oxide, with display, range 0-30ppm

F2 Fluorine
WC3AF2A F2, with display, range 0-1ppm

H2 Hydrogen
WC3AH2B H2, with display, range 0-2% vol
WC3AH2S H2, with display, range 0-2000ppm
WC3AH3B H2, with display, range 0-4% vol

H2S Hydrogen sulfide
WC3AHSA H2S, with display, range 0-30ppm
WC3AHSB H2S, with display, range 0-100ppm

CTX 300 with display 4-20mA – with electrochemical sensor supplied with cable gland

H2S Hydrogen sulfide
WC3AHSC H2S, with display, range 0-1000ppm

HCl Hydrogen chloride
WC3AHLA HCl, with display, range 0-30ppm
WC3AHLB HCl, with display, range 0-100ppm

HCN Hydrogen cyanide
WC3AHNA HCN, with display, range 0-10ppm
WC3AHNB HCN, with display, range 0-30ppm

HF Hydrogen fluoride
WC3AHFA HF, with display, range 0-10ppm

HNO3
CTX300-262 HNO3, without display, range 0-10ppm

NH3 Ammonia
WC3ANH1 NH3, with display, range 0-1000ppm
WC3ANH3 NH3, with display, range 0-100ppm

NO Nitric oxide
WC3ANOA NO, with display, range 0-100ppm
WC3ANOB NO, with display, range 0-300ppm
WC3ANOC NO, with display, range 0-1000ppm
WC3ANOD NO, with display, range 0-30ppm

NO2 Nitrogen dioxide
WC3AN2A NO2, with display, range 0-10ppm
WC3AN2B NO2, with display, range 0-30ppm

O2 Oxygen
B301312 O2 Special for Helium enrichment, without display, range 0-30% vol
WC3AO2F O2, with standard 2 year sensor lifetime, with display, range 0-30 % vol, -20°C to +50°C
WC3AO2G O2, with long life 5 year sensor lifetime, with display, range 0-30 % vol, -20°C to +50°C
WC3AO2S O2, with display, range 0-100% vol

O3 Ozone
WC3AO3A O3, with display, range 0-1ppm

CTX 300 with display 4-20mA – with electrochemical sensor supplied with cable gland

PH3 Phosphine
WC3APH3 PH3, with display, range 0-1ppm

SO2 Sulfur dioxide
WC3ASOA SO2, with display, range 0-10ppm
WC3ASOB SO2, with display, range 0-30ppm
WC3ASOC SO2, with display, range 0-100ppm

CTX 300 with display 4-20mA – with Infrared sensor supplied with cable gland

CO2 Carbon dioxide
WC3ACO2A CO2, with display, range 0-0.50 % vol
WC3ACO2B CO2, with display, range 0-5.00 % vol
WC3ACO2C CO2, with display, range 0-100 % vol

CTX 300 accessories

Calibration
6327906 Remote calibration cup
6331141 Calibration cup (all except OLCT-IR, CTX300 with semi-conductor sensor & 700 Series, all gases)
6331171 Calibration cup for semi-conductor CTX 300 versions
6335918 Humidifier kit for transmitters with semi-conductor sensor

Installation
6322420 CEX/CTX 300 , OLC(T)40, 50, 60 and 100 ceiling-mount
6323607 Gas collector
6793322 Universal pitot tube with DN 80 flange (requires a sampling cup)
6793718 CTX300, OLC(T) 50, 100, universal mounting Adapter Plate

Protection
6123716 Sunshield
6123717 Shock-guard protector
6331166 Splash guard
6335953 PTFE water barrier
6797902 300 series wall-mount protector

Sampling
6327905 Sampling cup

Replacement Sensors

6313544 Replacement sensor for CTX 300, R134a, R11, R23, R143a, R404a, R507, R410a, R32,R407c, R408a (Semi-conductor)
6313545 Replacement sensor for CTX 300, Methyl chloride 0-500ppm (Semi-conductor)
6313546 Replacement sensor for CTX 300, Solvants (Semi-conductor)
6313547 Replacement sensor for CTX 300, R22 (0-2000ppm) – R12 (0-1%) (Semi-conductor)
6793464 Replacement sensor for CTX 300, COV 0-500ppm (Semi-conductor)

ASH3 Arsine
6314185 Replacement sensor for CTX 300, ASH3, range 0-1ppm (Electrochemical)

C2H4O Ethylene oxide
6313961 Replacement sensor for CTX 300, C2H4 (ETHYLENE), range 0-1000ppm (Electrochemical)

Cl2 Chlorine
6313649 Replacement sensor for CTX 300, Cl2, range 0-10ppm (Electrochemical)
6314002 Replacement sensor for CTX 300, Cl2, range 0-30ppm (Electrochemical)

ClO2 Chlorine dioxide
6313678 Replacement sensor for CTX 300, ClO2, range 0-3ppm (Electrochemical)

CO Carbon monoxide
6313627 Replacement sensor for CTX 300, CO, range 0-100ppm (Electrochemical)
6313628 Replacement sensor for CTX 300, CO, range 0-300ppm (Electrochemical)
6313629 Replacement sensor for CTX 300, CO, range 0-1000ppm (Electrochemical)
6313631 Replacement sensor for CTX 300, CO, range 0-1 % (Electrochemical)
6313915 Replacement sensor for CTX 300, CO, range 0-2000ppm (Electrochemical)

CO2 Carbon dioxide
6314191 Replacement sensor for CTX 300, CO2, range 0-5% vol. (CTX 300 delivered since July of 2015) (InfraRed)
6314192 Replacement sensor for CTX 300, CO2, range 0-100% vol. (CTX 300 delivered since July of 2015) (InfraRed)
6314193 Replacement sensor for CTX 300, CO2, range 0-5000ppm (CTX 300 delivered since July of 2015) (InfraRed)

ETO
6313645 Replacement sensor for CTX 300, ETO, range 0-30ppm (Electrochemical)

F2 Fluorine
6313860 Replacement sensor for CTX 300, F2, range 0-1ppm (Electrochemical)

Formaldéhyde
6314183 Replacement sensor for CTX 300, Formaldéhyde, range 0-50ppm (Electrochemical)

H2 Hydrogen
6313650 Replacement sensor for CTX 300, H2, range 0-2000ppm (Electrochemical)
6313651 Replacement sensor for CTX 300, H2, range 0-2 % vol (Electrochemical)

H2S Hydrogen sulfide
6313633 Replacement sensor for CTX 300, H2S, range 0-30ppm (Electrochemical)
6313634 Replacement sensor for CTX 300, H2S, range 0-100ppm (Electrochemical)
6313635 Replacement sensor for CTX 300, H2S, range 0-1000ppm (Electrochemical)
6313934 Replacement sensor for CTX 300, H2S SP, range 0-100ppm (Electrochemical)

HCl Hydrogen chloride
6313652 Replacement sensor for CTX 300, HCl, range 0-30ppm (Electrochemical)
6313653 Replacement sensor for CTX 300, HCl, range 0-100ppm (Electrochemical)

HCN Hydrogen cyanide
6313654 Replacement sensor for CTX 300, HCN, range 0-10ppm (Electrochemical)
6313655 Replacement sensor for CTX 300, HCN, range 0-30ppm (Electrochemical)

HF Hydrogen fluoride
6313675 Replacement sensor for CTX 300, HF, range 0-10ppm (Electrochemical)

NH3 Ammonia
6313656 Replacement sensor for CTX 300, NH3, range 0-100ppm (Electrochemical)
6313657 Replacement sensor for CTX 300, NH3, range 0-1000ppm (Electrochemical)
6313850 Replacement sensor for CTX 300, NH3, range 0-100ppm, low temperature, application -40°C/-40°F (Electrochemical)
6313893 Replacement sensor for CTX 300, NH3, range 0-5000ppm (Electrochemical)
6314127 Replacement sensor for CTX 300, NH3, range 0-1000ppm low temperature, application -40°C/-40°F (Electrochemical)

NO Nitric oxide
6313636 Replacement sensor for CTX 300, NO, range 0-100ppm (Electrochemical)
6313637 Replacement sensor for CTX 300, NO, range 0-300ppm (Electrochemical)
6313638 Replacement sensor for CTX 300, NO, range 0-1000ppm (Electrochemical)
B301090 Replacement sensor for CTX 300, NO, range 0-30ppm (Electrochemical)

NO2 Nitrogen dioxide
6313639 Replacement sensor for CTX 300, NO2, range 0-10ppm (Electrochemical)
6313640 Replacement sensor for CTX 300, NO2, range 0-30ppm (Electrochemical)
6314001 Replacement sensor for CTX 300, NO2, range 0-100ppm (Electrochemical)

O2 Oxygen
6313660 Replacement sensor for CTX 300, O2 special, range 0-100% Vol (Electrochemical)
6313867 Replacement sensor for CTX 300, O2, range 0-30% Vol. – Wingas (Electrochemical)
6313C2A Replacement sensor for CTX 300, O2, range 0-30% Vol. (2 year sensor lifetime) (Electrochemical)
6313C5A Replacement sensor for CTX 300, O2, range 0-30% Vol. (5 year sensor lifetime) (Electrochemical)
B301072 CTX 300 O2 Special for Helium enrichment, with display, range 0-30% vol
B301083 Replacement sensor for CTX 300, O2 special, range 0-30% Vol (O2 deficiency following a helium leak) (Electrochemical)

O3 Ozone
6313676 Replacement sensor for CTX 300, O3, range 0-1ppm (Electrochemical)

PH3 Phosphine
6313677 Replacement sensor for CTX 300, PH3, range 0-1ppm (Electrochemical)
6313919 Replacement sensor for CTX 300, PH3, range 0-1000ppm (Electrochemical)

SiH4
6313834 Replacement sensor for CTX 300, SIH4, range 0-50ppm (Electrochemical)

SO2 Sulfur dioxide
6313646 Replacement sensor for CTX 300, SO2, range 0-10ppm (Electrochemical)
6313647 Replacement sensor for CTX 300, SO2, range 0-30ppm (Electrochemical)
6313648 Replacement sensor for CTX 300, SO2, range 0-100ppm (Electrochemical)

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