Thank you for purchasing a RP Resistive Chain Continuous Level Probe from APG. We appreciate your
business! Please take a few minutes to familiarize yourself with your RPE or RPX and this manual.
The RP resistive probes contain reed switches in a 1/2” Ø stainless steel stem and a permanent magnet
in a oat. As the oat rises or falls with the level of the liquid, the magnet inside the oat acts on the
corresponding reed switches inside the stem changing the output of the probe. The RPX carries explosion
proof, intrinsically safe, and non-incendive hazardous location approvals.
Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, and
serial number. Please ensure that the part number on your label matches your order.
RPX Electrical ratings
Class I Division 1, Groups C, and D T3Ta 40°C
Rated: 5 - 24 VDC, 100 mA, or 12 - 24 VDC, 4-20 mA
C
Ex d, IIB T3
Class I Zone1, AEx, IIB T3
Ta 40°C
Rated: 5 - 24 VDC, 100 mA, or 12 - 24 VDC, 4-20 mA
US
Class I Division 2, Groups C, and D T3
Ta 85°C
Rated: 5 - 24 VDC, 100 mA, or 12 - 24 VDC, 4-20 mA
Class I Division 2, Groups C, and D T3
Ta 85°C
Field wiring is non-incendive when installed per drawing 9001932
Rated: 5 - 15 VDC, 100 mA, or 12 - 24 VDC, 4-20 mA
Class I Division 1, Groups C, and D T3C
Max Ta 85°C
Intrinsically Safe when installed per drawing 9001930 with following entity parameters:
V
Rated: loop-powered 24 VDC, 4-20 mA converter module
= 30 V, I
max
= 130 mA, Ci = 3 nF, Li = 0 μH
max
IMPORTANT: Your RPX MUST be installed according to drawing 9001930 (IS Hazard-
ous Installation Drawing For RPX) or 9001932 (Hazardous Mounting Drawing RPX) to meet
listed approvals. Faulty installation will invalidate all safety approvals and ratings.
DANGER: OPEN CIRCUIT BEFORE REMOVING COVER or KEEP COVER TIGHT WHILE CIRCUITS ARE ALIVE;
AVERTISSEMENT -- COUPER LE COURANT AVANT D’ENLEVER LE COUVERCLE, ou GARDER LE COUVERCLE
FERME TANT QUE LES CIRCUITS SONT SOUS TENSION.
IMPORTANT: SEAL SHALL BE INSTALLED WITHIN 50 mm OF THE ENCLOSURE;
IMPORTANT -- UNSCELLEMENT DOIT ETRE INSTALLE A MOINS DE 50 mm DU BOITIER.
DANGER: EXPLOSION HAZARD-DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO
BE NON-HAZARDOUS;
AVERTISSEMENT -- RISQUE D’EXPLOSION. NE PAS DEBRANCHER TANT QUE LE CIRCUIT EST SOUS TENSION, A
MOINS QU’IL NE S’AGISSE D’UN EMPLACEMENT NON DANGEREUX.
WARNING: SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY;
AVERTISSEMENT -- LA SUBSTITUTION DE COMPOSANTS PEUT COMPROMETTRE LA SECURITE INTRINSEQUE.
Warranty and Warranty Restrictions
This product is covered by APG’s warranty to be free from defects in material and workmanship under
normal use and service of the product for 24 months. For a full explanation of our Warranty, please visit
https://www.apgsensors.com/about-us/terms-conditions. Contact Technical Support to receive a Return
Material Authorization before shipping your product back.
Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.
Resolution ±0.25 in. (6.4 mm)
Accuracy ±0.12 in. (3 mm)
Environmental
Temperature See Chart Below
Maximum pressure 72.5 PSI (5 bar)
Enclosure Protection NEMA 4 & 7, IP65
Electrical
Output 4-20 mA; Resistive
Typical Current (Resistive Output) I = VDC supply / (45 Ω * Length in inches)
Internet Connectivity via RST-5003; 4-20 mA output only
Materials of Construction
Stem 316L Stainless Steel
Floats 316L Stainless Steel, or Buna
Housing Die Cast Aluminum
Mechanical
Conduit connection 3/4” NPTM
Maximum stem length 96 inches / 8 feet / 2440 mm
Float Specic Gravity 0.39, 0.57, or 0.65
RPX Outputs with Temperature and Power Requirements for Hazardous Locations
Output
A - 4-20 mA,
Hazardous
R -Resistive,
Hazardous
I - 4-20 mA,
Intrinsically
Safe
Intrinsically Safe
Class I, Div. 1
Groups C & D T3C
--
--
Loop powered 24
VDC;
Install per dwg
9001930
-40° - 85° C / (-40° -
185°F)
Class I, Div. 1 Groups C & D T3;
Class I, Zone 1 Ex/AEx d, IIB T3
Resolution ±0.25 in. (6.4 mm)
Accuracy ±0.12 in. (3 mm)
Environmental
Temperature -40 - 85°C / -40 - 185°F
Maximum Pressure 72.5 PSI (5 bar)
Enclosure Protection
Large Aluminum NEMA 4 & 7, IP65
Small Nylon IP65
Small Aluminum NEMA 4X, IP68
Electrical
Output 4-20 mA; Resistive
Voltage and Current Ratings Resistive 5 - 24 VDC, 100 mA (max)
4-20 mA 12 - 24 VDC, 4-20 mA
Typical Current (Resistive Output) I = VDC supply / (45 Ω * Length in inches)
Hookup wire 22 AWG
Internet Connectivity via RST-5003; 4-20 mA output only
Masterials of Construction
Materials
Stem 316L Stainless Steel
Floats 316L Stainless Steel, or Buna
Housing
Large Cast Aluminum
Small Nylon
Small Aluminum
Mechanical
Conduit connection
Large Aluminum 3/4” NPT
Small Nylon 1/2” NPT
Small Aluminum 3/4” NPT
Maximum stem length 153 inches / 12.75 feet / 3890 mm
Float Specic Gravity 0.39, 0.57, or 0.65
Model Number: RPX - _____ - _____ _____ - __S6__ - _____ - _____
A B C D E F
A. Output
□ A Hazardous, 4-20 mA output
□ R Hazardous, resistive output
□ I Intrinsic safety, 4-20 mA output
B. Mounting Type, Option, and Size
□ F Flat Face ANSI 150# Flange (size=1.5, 2, 2.5, 3, 4)
□ R Raised Face ANSI 150# Flange (size=1.5, 2, 2.5, 3, 4)
□ S Triclamp (size=2, 2.5, 3, 4)
□ P Externally-mounted NPT Plug 150#
(size=1.5†, 2, 2.5, 3, 4)
□ N None
D. Stem Material
□ S6 316L Stainless Steel
E. Float Type
□
E 316L SS 2.01 in. (53 mm) Round; 0.57 SG
□ F 316L SS 2.17h x 1.48w in. (55h x 38w mm); 0.65 SG
□ G Buna 1.77h x 1.89w in. (45h x 48w mm); 0.39 SG
F. Stem Length in Inches
□ __
C. Mounting Connection
□ W Welded (xed)
□ S Slide with Compression Fitting
†Note: Size 1.5 NPT Externally-mounted (P1.5) requires oat F.
Model Number: RPE - _____ - _____ _____ - __S6__ - _____ - _____ - _____ _____
A B C D E F G H
Min. 11 in. - Max 96 in.
A. Output
□ A 4-20 mA output†
□ R Resistive output
B. Mounting Type, Option, and Size
□ F Flat Face ANSI 150# Flange (size=1.5, 2, 2.5, 3, 4)
□ R Raised Face ANSI 150# Flange (size=1.5, 2, 2.5, 3, 4)
□ S Triclamp (size=2, 2.5, 3, 4)
□ P Externally-mounted NPT Plug 150#
(size=1.5††, 2, 2.5, 3, 4)
□ I Internally-mounted NPT Plug 150#†††
(size=0.25, 0.375, 0.5, 0.75, 1, 1.25, 1.5)
□ N None
C. Mounting Connection
□ W Welded (xed)
□ S Slide with Compression Fitting
D. Stem Material
□ S6 316L Stainless Steel
†Note: Output A 4-20 mA requires Housing A Large Aluminum.
††Note: Size 1.5 NPT Externally-mounted (P1.5) requires oat F.
†††Note: Mounting Type I Internally-mounted NPT Plug requires
Housing W Hookup Wire and Output R Resistive.
E. Float Type
□
E 316L SS 2.01 in. (53 mm) Round; 0.57 SG
□ F 316L SS 2.17h x 1.48w in. (55h x 38w mm); 0.65 SG
□ G Buna 1.77h x 1.89w in. (45h x 48w mm); 0.39 SG
F. Stem Length in Inches
□ __
Min. 11 in. - Max 153 in.
G. Housing, Cable Entry Size
□ A
□ B
□ C
□ W Hookup wire (no housing)
Large Aluminum, 3/4” NPT
Small Nylon, 1/2” NPT
Small Aluminum, 3/4” NPT
Provide the compatible mating ange on the tank and install using a suitable gasket.
Plug Mounting
Provide the compatible female boss on the tank and install the probe with thread tape.
• Electrical Installation
DANGER: Do not remove the housing cover until the atmosphere is determined safe,
and the power supply is turned o.
For RPX and RPE probes with Housings
• Install conduit and/or cable with necessary seal(s) per Drawing 9001930 or 9001932 for hazardous
locations.
• Remove housing cover.
• Check the Wire Color and Terminal Tables on page 6 before making any connections.
• Connect the wire for your system to the appropriate terminal.
• Replace housing cover.
For RPE probes with hookup wires
• Pull probe hookup wires through conduit as appropriate before attaching conduit to top of probe.
• Check the Wire Color and Terminal Tables on page 6 before making any connections.
• Connect the wires from the probe to your system appropriately.
IMPORTANT: Your RPX MUST be installed according to drawing 9001930 (IS Hazard-
ous Installation Drawing For RPX) or 9001932 (Hazardous Mounting Drawing RPX) to meet
listed approvals. Faulty installation will invalidate all safety approvals and ratings.
• Removal Instructions
Removing your RP probe from service must be done with care.
• Ensure all circuits are de-energized, and any hazardous atmosphere has dispersed.
• Disconnect wires, at terminals in RP head or at your system.
• Remove the RP with an appropriately sized wrench (per your mounting type).
• Clean the RP’s stem and oat of any debris (see General Care) and inspect for damage.
• Store your RP in a dry place, at a temperature between -40° and 40°C (-40° and 104°F).
Models FLXx and FLRx, rated 220 V, 0.5 A;
Models RPMx, RPXx and RPEx, rated 5 - 15 Vdc, 100 mA, or 12 to 24 Vdc, 4-20mA;
Model RPAx, rated 12 to 24 Vdc, 4-20mA;
Model CTR-0100 (P/Ns 110101 and 110101-0001), Loop Powered 4-20mA Module, rated 4-20mA output is
12 to 24 Vdc.
Note: The above models are Pollution Degree 2, Measurement Category II.
Notes for Models FLXx, FLRx, RPMx, RPAx, RPXx, RPEx:
1. The "x" in the Model designations may be any alpha-numeric character, to denote minor mechanical options,
not affecting safety. Refer to Illustration 28 for Model designator and suffix details.
2. The equipment is intended to be installed as required by the applicable electrical code (CEC, NEC) and as
specified by the manufacturer’s Installation Instructions.
3. The circuit board P/N STF-CTR-01** from the Model RPMx Probe may be supplied as a component part
where the suitability of the final installation will be inspected by the authority with jurisdiction in the area
where installed.
4. The installation will be inspected by the authority with jurisdiction in the area where installed.
FS-400, FS-410 and FS-500 float switches. Single Seal (MWP 1000psi). Ambient temperature -40°C to 260°C.
Type 4X (NPT Connection Only). Ratings as follows:
Conditions of Acceptability for FS-400, FS-410, and FS-500
The equipment must be connected to a purely resistive load
The equipment must be grounded through final installation
CLASS 2258 02 - PROCESS CONTROL EQUIPMENT - FOR HAZARDOUS LOCATIONS
CLASS 2258 82 - PROCESS CONTROL EQUIPMENT - FOR HAZARDOUS LOCATIONS, U.S.
Requirements
Class I, Division 1, Groups C, and D T3
Float Level Sensors, model FLXx, rated 220 V, 0.5 A, max. or rated 24Vdc, 0.5A, max., and model RPMx
and RPXx, rated 5 - 24 Vdc, 100mA or 12 to 24 Vdc, 4-20mA; operating ambient 40°C.
Ex d, IIB T3
Class I, Zone 1, AEx d, IIB T3
Float Level Sensors, model FLXx, rated 24 Vdc, 0.5 A, max., and model RPMx and RPXx, rated 5 - 24 Vdc,
100mA or 12 to 24 Vdc, 4-20mA; operating ambient 40°C.
Notes for Models FLXx, RPMx, RPXx:
1. The "x" in the Model designations may be any alpha-numeric character, to denote minor mechanical options,
not affecting safety.
2. The equipment is intended to be installed as required by the applicable electrical code (CEC, NEC) and as
specified by the manufacturers Installation Instructions.
3. The installation will be inspected by the authority with jurisdiction in the area where installed.
Float Level Sensor model FLXx, rated 220 V, 0.5 A, model RPMx and RPXx, rated 5 - 15 Vdc, 100mA, or
rated 12 to 24 Vdc, 4-20mA, and model RPAx, rated 12 to 24 Vdc, 4-20mA; max; operating ambient 85°C.
Notes for Models FLXx, RPMx, RPAx, RPXx:
1. The "x" in the Model designations may be any alpha-numeric character, to denote minor mechanical options,
not affecting safety.
2. The equipment is intended to be installed as required by the applicable electrical code (CEC, NEC) and as
specified by the manufacturers Installation Instructions.
3. The installation will be inspected by the authority with jurisdiction in the area where installed.
Class I Division 1 Groups A, B, C, and D, Class II Division 1 Groups E, F, Class III; T3
Class I Division 2 Groups A, B, C, and D, Class II Division 2 Groups F, G; T200°C
FS-400, FS-410, and FS-500 (NPT Connection) float switches. Single Seal (MWP 1000psi). Ambient temperature
-40°C to 187°C. Type 4X. Seal Not Required. Ratings as follows:
The equipment must be connected to a purely resistive load
The equipment must be grounded through final installation
CLASS 2258 03 - PROCESS CONTROL EQUIPMENT - INTRINSICALLY SAFE AND NON INCENDIVE
SYSTEMS - FOR HAZARDOUS LOCATIONS
CLASS 2258 83 - PROCESS CONTROL EQUIPMENT - INTRINSICALLY SAFE AND NON INCENDIVE
SYSTEMS - FOR HAZARDOUS LOCATIONS, CERTIFIED TO U.S. STANDARDS
Class I, Division 2, Groups C, and D T3
Float Level Sensor model RPMx and RPXx, rated 5 - 15 Vdc, 100mA, or rated 12 to 24 Vdc, 4-20mA, and
model RPAx, rated 12 to 24 Vdc, 4-20mA; max; operating ambient 85°C. Field wiring is non-incendive when
installed per drawings 9001415, 9001932 and 9002023 respectively.
Notes for Models RPMx, RPAx, RPXx:
1. The "x" in the Model designations may be any alpha-numeric character, to denote minor mechanical options,
not affecting safety.
2. The equipment is intended to be installed as required by the applicable electrical code (CEC, NEC) and as
specified by the manufacturers Installation Instructions.
3. The installation will be inspected by the authority with jurisdiction in the area where installed.
CLASS 2258 04 - PROCESS CONTROL EQUIPMENT - INTRINSICALLY SAFE, ENTITY
- FOR HAZARDOUS LOCATIONS
CLASS 2258 84 - PROCESS CONTROL EQUIPMENT - INTRINSICALLY SAFE, ENTITY
- FOR HAZARDOUS LOCATIONS, U.S. Requirements
Class I, Division 1, Groups C, and D
Float Level Sensors, model RPMx, RPAx, RPXx and model CTRx loop powered 24Vdc, 4-20mA converter
module, max. operating ambient 85°C; Temperature Code rating T3C; Intrinsically Safe when connected as
per drawing 9001414, 9001423 and 9001930 with the following Entity Parameters: Vmax = 30V, Imax =
130mA, Ci = 3nF, Li = 0uH.
Notes for Models RPMx, RPAx and RPXx:
1. The "x" in the Model designations may be any alpha-numeric character, to denote minor mechanical options,
not affecting safety.
2. The equipment is intended to be installed as required by the applicable electrical code (CEC, NEC) and as
specified by the manufacturers Installation Instructions.
3. The installation will be inspected by the authority with jurisdiction in the area where installed.