HDM-135A (2-wire system) HDM-136A (4-wire system)
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The pH transmitter is a user-friendly device that features a compact and robust aluminum case, making it ideal for on-site installation. This device comes in two different models: the 2-wire system (24VDC power supply) and the 4-wire system (adjustable-voltage AC power supply). Features Simplified calibration with standard solutions The data for up to five different pH standard solutions can be stored in the internal memory for single-action calibration. Stability judgement function provides accurate calibration with standard solutions, free from operator error. Automatic determination of electrode quality The transmitter judges the electrode quality from its characteristics during calibration with standard solutions. Degradation of electromotive force at pH7, degradation o felectromotive force per pH and other information is displayed in the form of error messages. Characteristic data of each electrode can be called out to determine the extent of degradation as required. Temperature display The analyzer/transmitter measures and displays the temperature of samples and standard solutions using a pH electrode equipped with an internal temperature sensor (5600, GSS-304B, or other model). Output hold while performing maintenance work When the transmitter enters maintenance (ST-BY) mode, the previous output value is held. This helps to prevent disruptions to the control system. Measured value shift Measured pH values can be shifted for operational control. (Shift width: ±1.0pH) Manual temperature compensation Manual temperature compensation function (0-100ºC) can be provided for use with electrodes which do not have compensation functions. pH temperature compensation The transmitter compensates the pH temperature characteristics of samples (such as pure water and boiler water). Setting range of temperature compensation coefficient : ±0.1pH/ºC Standard conversion temperature: 25ºC Self-diagnostics The transmitter detects damage on the glass membrane, problem with temperature compensation resistance, hardware failures and abnormal data. If a fault is detected, the transmission output is switched to the upper or lower limit to notify the fault (burn-out function). Automatic reversion to measurement mode The analyzer/transmitter automatically switches back to measurement mode if it is left in maintenance mode for more than two hours. External input for “hold” feature (option) The transmitter can receive a “hold” command signal from the cleaning devices to hold output during the cleaning. System configuration Transmitter HDM-135A Instrument room Electrode lead Indicator Recorder Controller DCS, etc. Indicator Recorder Controller DCS, etc. Electrode lead Instrument room

Features Product name Model pH transmitter HDM-135A (2-wire system) HDM-136A (4-wire system) pH: -1.00~14.00 mV: -600~600 mV Measurement range Temperature: 0~100ºC Display only. No output-signal. Digital LCD Display pH; 0.01, mV; 0.1, Temperature; 0.1˚C Precision Within ±0.03pH (at equivalent input) Performance Linearity Within ±0.02pH or less (at equivalent input) (excluding detector) Repeatability Output signal 4~20mADC, isolated. Load resistance: Max 650Ω or less. Adjustable range between -1~14pH (0.1pH steps). Output range Minimum width of 2 pH. Power supply 24VDC ±10% 90~132VAC 50/60Hz...

Mounting bracket (for 50A pipe) (Brackets fit either side) Optional terminal cable port G 3/4 (PF 3/4 F) (with gasket for ø11 cable) Power/transmission cable port G 3/4 (PF 3/4) with gasket for ø11 cable Electrode lead port G 3/4 (PF 3/4 F) with gasket for ø6 lead Mounting bracket (for 50A pipe) (Brackets fit either side) Power cable port G 3/4 (PF 3/4 F) (with gasket for ø11 cable) Transmission output cable port G 3/4 (PF 3/4) with gasket for ø11 cable Electrode lead port G 3/4 (PF 3/4 F) with gasket for ø6 lead Hood (option) Recommended when installing the instrument in a location exposed...

Wiring diagrams for 2-wire system Electrode lead <When electrode is directly connected to transmitted -y^rr\ Power / transmission output line (4~20mADC) <When the electrode is connected via a junction box and extension cable> Junction box cr in Fvioncinn r-ahio Transmitter Electrode lead <Wiring example when using the device together with a RHC-7C chemical cleaner> When the transmitter is equipped with the external input for the output hold command Electrode lead Power / transmission output line Transmission output Load resistance: 650Q or less Output hold command line Chemical cleaner...

Wiring diagrams for 4-wire system Electrode lead When the transmitter is equipped with the input for the external output hold command (terminals #10~#11 (option)) Electrode lead HDM-136A transmitter 1 2 3 4 5 E Transmission output line Output hold command line Class D Chemical cleaner Control unit Output 4~20mADC is held during cleaning or when the mode selector switch is set to ST-BY. AC power supply (100VAC 50/60Hz) Class D Liquid transfer unit NC NO Air supply Pressure reducing valve with gauge (setting range 0.06~0.1 MPa): Option Liquid transfer tube 3 Connection terminals description...

Product code Custom spec. code: Numeric digit: 9 Alphabet: Z Transmission output range (4~20mADC) 0~14 pH 0~10 pH 0~8 pH 2~12 pH 4~14 pH 4~10 pH 6~14 pH Custom spec.*1 Input for external output hold command*2 None Equipped Surface finish (coating)*3 Standard coating High performance coating Arrester*4 None Included Assembly with cable port adapter None, G3/4 (PF3/4) standard G1/2 (PF1/2) SUS304 NPT1/2 SUS304 NPT3/4 SUS304 Electrode lead port Direct connection EC-10 Extension cable (connection with FC-4) Hood (sun shade) None Equipped (No. 544493K) Markings Japanese (standard) English...

Extension cable The extension cable is a special cable specifically manufactured for a pH/ORP analyzer. It connects the transmitter and junction box. Conductor (0.3mm2) PE insulation (natural color) Semi-conductive PVC Shielding PET tape winding PE core sheath (black) Conductor (0.3mm2) PE insulation (green) PE insulation (red) Filler Cloth tape winding Shielding PVC sheath PE insulation (blue) Model : EC-10 Outside diameter : ø8 Insulation : Polyethylene and PVC Sheath : PVC Insulation resistance between core conductors : 105MΩ or greater/100m. Maximum cable length : 100m, no cable...