YAMATAKE C315 Temperature Controllers

Technical Dossier

Product Details And Specifications

YAMATAKE C315 Series: Comprehensive Module Range and Technical Overview

The YAMATAKE C315 series of electronic temperature controllers occupies a well-established position in global heavy industry, with documented installations across petrochemical complexes, nuclear auxiliary systems, refinery process units, and continuous casting lines. Manufactured by Yamatake Corporation (now Azbil Corporation), the C315 platform was engineered for single-loop and cascade temperature regulation in environments demanding sustained accuracy under thermal stress, vibration, and EMI exposure. Its DIN-rail and panel-mount form factors made it a standard specification item for EPC contractors across Asia-Pacific, the Middle East, and Eastern Europe throughout the 1990s and 2000s. The C315GA004500 variant specifically addresses analog input/output configurations with a 4–20 mA control output, making it directly interchangeable within legacy SCADA and DCS architectures that rely on standard current-loop signaling.

The Evolution of C315 Architecture

The C315 series was introduced as part of Yamatake-Honeywell's transition from analog relay-based controllers to microprocessor-driven digital PID platforms in the late 1980s. Early variants used EPROM-based parameter storage and required manual calibration via front-panel trim potentiometers. Mid-generation revisions introduced EEPROM non-volatile memory, eliminating parameter loss on power interruption — a critical reliability improvement for continuous process industries. Later C315 sub-variants incorporated RS-485 serial communication capability, enabling integration with early MODBUS RTU supervisory networks without requiring a separate communication adapter module.

Compatibility across C315 sub-variants is constrained by the suffix code structure: the GA suffix denotes the analog output variant, while alternative suffixes indicate relay output (RY), voltage pulse output (VP), and current transformer input (CT) configurations. Cross-substitution between suffix families requires verification of the downstream actuator's input specification. The C315 series reached end-of-production status; Azbil Corporation's SDC35 and SDC36 series represent the current-generation functional replacements, though direct drop-in substitution requires terminal adapter plates and parameter remapping.

C315 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the YAMATAKE C315 series, classified by output type and input configuration:

Analog Output (4–20 mA) Controllers

C315GA004500: Single-loop PID, analog 4–20 mA output, universal thermocouple/RTD input, panel mount
C315GA004000: Single-loop PID, analog output, reduced display variant, DIN rail mount
C315GA005000: Single-loop PID, analog output, extended input range for high-temperature thermocouple types
C315GA006000: Cascade PID configuration, dual analog output, process/setpoint tracking mode

Relay Output Controllers

C315RY004500: Single-loop on/off and PID, SPDT relay output, universal input, panel mount
C315RY004000: Relay output, DIN rail, simplified operator interface
C315RY005000: Relay output, high-temperature input range, alarm relay included
C315RY006000: Dual relay output, heating/cooling split control, cascade-capable

Voltage Pulse Output Controllers

C315VP004500: Voltage pulse output for SCR/thyristor drive, universal thermocouple input
C315VP005000: Voltage pulse, extended input, suitable for silicon carbide element furnaces
C315VP006000: Dual voltage pulse output, heating/cooling zone control

Current Transformer Input Variants

C315CT004500: CT input for heater break alarm detection, analog output, panel mount
C315CT005000: CT input, extended range, dual alarm output

Communication-Enabled Variants

C315GA004500-RS: C315GA004500 base with factory-fitted RS-485 MODBUS RTU communication port
C315GA006000-RS: Cascade PID with RS-485, dual analog output, supervisory setpoint write capability

Sourcing Hard-to-Find & Obsolete C315 Parts

The C315 series has been formally discontinued by Azbil Corporation. OEM new-old-stock (NOS) inventory is no longer available through standard distribution channels. DriveKNMS maintains a dedicated procurement network for end-of-life Yamatake and Azbil instrumentation, sourcing verified surplus units from decommissioned plant inventories, authorized refurbishers, and controlled warehouse liquidations across Japan, South Korea, and Southeast Asia.

For the C315GA004500 and related analog output variants, DriveKNMS holds rotating stock subject to availability. Each unit sourced through DriveKNMS is accompanied by a condition report specifying cosmetic grade, functional test result, and firmware/parameter status. For customers requiring long-term maintenance contracts covering multi-unit C315 installations, DriveKNMS offers blanket purchase order arrangements with reserved allocation and priority dispatch.

Customers operating legacy DCS systems that cannot be migrated to current-generation Azbil SDC controllers — due to panel cutout constraints, wiring harness compatibility, or site change-management restrictions — are advised to establish a minimum 2-year forward stock position for critical loop controllers. DriveKNMS can assist with lifecycle planning and stock reservation agreements.

Quality Control for the C315 Range

All C315 series units processed by DriveKNMS undergo a structured functional verification protocol prior to dispatch. The test sequence covers: power-on self-diagnostic pass confirmation; input accuracy verification across the full thermocouple and RTD input range using a calibrated Fluke 724 or equivalent process calibrator; PID output linearity check across the 4–20 mA range with a precision current meter; alarm setpoint activation and relay/output response verification; front-panel operator interface key function test; and RS-485 communication handshake test (where applicable).

Units exhibiting display segment failure, input drift exceeding ±0.3% of span, or output non-linearity are quarantined and not offered for resale. Parameter memory is cleared and reset to factory defaults prior to shipment unless the customer specifies a pre-configured parameter set. All test records are retained for 24 months and available on request.